union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
        struct perf_annotate *ann = container_of(ops, struct perf_annotate, ops);
        struct addr_location al;
 
-       if (perf_event__preprocess_sample(event, session, &al, sample,
+       if (perf_event__preprocess_sample(event, machine, &al, sample,
                                          symbol__annotate_init) < 0) {
                pr_warning("problem processing %d event, skipping it.\n",
                           event->header.type);
 
 #include "util/debug.h"
 #include "util/event.h"
 #include "util/hist.h"
+#include "util/evsel.h"
 #include "util/session.h"
 #include "util/sort.h"
 #include "util/symbol.h"
                                      union perf_event *event,
                                      struct perf_sample *sample,
                                      struct perf_evsel *evsel __used,
-                                     struct perf_session *session)
+                                     struct machine *machine)
 {
        struct addr_location al;
 
-       if (perf_event__preprocess_sample(event, session, &al, sample, NULL) < 0) {
+       if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
                pr_warning("problem processing %d event, skipping it.\n",
                           event->header.type);
                return -1;
        if (al.filtered || al.sym == NULL)
                return 0;
 
-       if (hists__add_entry(&session->hists, &al, sample->period)) {
+       if (hists__add_entry(&evsel->hists, &al, sample->period)) {
                pr_warning("problem incrementing symbol period, skipping event\n");
                return -1;
        }
 
-       session->hists.stats.total_period += sample->period;
+       evsel->hists.stats.total_period += sample->period;
        return 0;
 }
 
 
 
 static int perf_event__repipe_synth(struct perf_event_ops *ops __used,
                                    union perf_event *event,
-                                   struct perf_session *session __used)
+                                   struct machine *machine __used)
 {
        uint32_t size;
        void *buf = event;
        return 0;
 }
 
+static int perf_event__repipe_op2_synth(struct perf_event_ops *ops,
+                                       union perf_event *event,
+                                       struct perf_session *session __used)
+{
+       return perf_event__repipe_synth(ops, event, NULL);
+}
+
+static int perf_event__repipe_event_type_synth(struct perf_event_ops *ops,
+                                              union perf_event *event)
+{
+       return perf_event__repipe_synth(ops, event, NULL);
+}
+
 static int perf_event__repipe_tracing_data_synth(union perf_event *event,
-                                                struct perf_session *session)
+                                                struct perf_session *session __used)
 {
-       return perf_event__repipe_synth(NULL, event, session);
+       return perf_event__repipe_synth(NULL, event, NULL);
 }
 
 static int perf_event__repipe_attr(union perf_event *event,
 static int perf_event__repipe(struct perf_event_ops *ops,
                              union perf_event *event,
                              struct perf_sample *sample __used,
-                             struct perf_session *session)
+                             struct machine *machine)
 {
-       return perf_event__repipe_synth(ops, event, session);
+       return perf_event__repipe_synth(ops, event, machine);
 }
 
 static int perf_event__repipe_sample(struct perf_event_ops *ops,
                                     union perf_event *event,
                              struct perf_sample *sample __used,
                              struct perf_evsel *evsel __used,
-                             struct perf_session *session)
+                             struct machine *machine)
 {
-       return perf_event__repipe_synth(ops, event, session);
+       return perf_event__repipe_synth(ops, event, machine);
 }
 
 static int perf_event__repipe_mmap(struct perf_event_ops *ops,
                                   union perf_event *event,
                                   struct perf_sample *sample,
-                                  struct perf_session *session)
+                                  struct machine *machine)
 {
        int err;
 
-       err = perf_event__process_mmap(ops, event, sample, session);
-       perf_event__repipe(ops, event, sample, session);
+       err = perf_event__process_mmap(ops, event, sample, machine);
+       perf_event__repipe(ops, event, sample, machine);
 
        return err;
 }
 static int perf_event__repipe_task(struct perf_event_ops *ops,
                                   union perf_event *event,
                                   struct perf_sample *sample,
-                                  struct perf_session *session)
+                                  struct machine *machine)
 {
        int err;
 
-       err = perf_event__process_task(ops, event, sample, session);
-       perf_event__repipe(ops, event, sample, session);
+       err = perf_event__process_task(ops, event, sample, machine);
+       perf_event__repipe(ops, event, sample, machine);
 
        return err;
 }
 {
        int err;
 
-       perf_event__repipe_synth(NULL, event, session);
+       perf_event__repipe_synth(NULL, event, NULL);
        err = perf_event__process_tracing_data(event, session);
 
        return err;
 }
 
 static int dso__inject_build_id(struct dso *self, struct perf_event_ops *ops,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
        u16 misc = PERF_RECORD_MISC_USER;
-       struct machine *machine;
        int err;
 
        if (dso__read_build_id(self) < 0) {
                return -1;
        }
 
-       machine = perf_session__find_host_machine(session);
-       if (machine == NULL) {
-               pr_err("Can't find machine for session\n");
-               return -1;
-       }
-
        if (self->kernel)
                misc = PERF_RECORD_MISC_KERNEL;
 
        err = perf_event__synthesize_build_id(ops, self, misc, perf_event__repipe,
-                                             machine, session);
+                                             machine);
        if (err) {
                pr_err("Can't synthesize build_id event for %s\n", self->long_name);
                return -1;
                                      union perf_event *event,
                                      struct perf_sample *sample,
                                      struct perf_evsel *evsel __used,
-                                     struct perf_session *session)
+                                     struct machine *machine)
 {
        struct addr_location al;
        struct thread *thread;
 
        cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 
-       thread = perf_session__findnew(session, event->ip.pid);
+       thread = machine__findnew_thread(machine, event->ip.pid);
        if (thread == NULL) {
                pr_err("problem processing %d event, skipping it.\n",
                       event->header.type);
                goto repipe;
        }
 
-       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
-                             event->ip.pid, event->ip.ip, &al);
+       thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
+                             event->ip.ip, &al);
 
        if (al.map != NULL) {
                if (!al.map->dso->hit) {
                        al.map->dso->hit = 1;
                        if (map__load(al.map, NULL) >= 0) {
-                               dso__inject_build_id(al.map->dso, ops, session);
+                               dso__inject_build_id(al.map->dso, ops, machine);
                                /*
                                 * If this fails, too bad, let the other side
                                 * account this as unresolved.
        }
 
 repipe:
-       perf_event__repipe(ops, event, sample, session);
+       perf_event__repipe(ops, event, sample, machine);
        return 0;
 }
 
        .fork           = perf_event__repipe,
        .exit           = perf_event__repipe,
        .lost           = perf_event__repipe,
-       .read           = perf_event__repipe,
+       .read           = perf_event__repipe_sample,
        .throttle       = perf_event__repipe,
        .unthrottle     = perf_event__repipe,
        .attr           = perf_event__repipe_attr,
-       .event_type     = perf_event__repipe_synth,
+       .event_type     = perf_event__repipe_event_type_synth,
        .tracing_data   = perf_event__repipe_tracing_data_synth,
-       .build_id       = perf_event__repipe_synth,
+       .build_id       = perf_event__repipe_op2_synth,
 };
 
 extern volatile int session_done;
 
                                union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel __used,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(session, event->ip.pid);
+       struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 
        if (thread == NULL) {
                pr_debug("problem processing %d event, skipping it.\n",
 
                                union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel __used,
-                               struct perf_session *s)
+                               struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(s, sample->tid);
+       struct thread *thread = machine__findnew_thread(machine, sample->tid);
 
        if (thread == NULL) {
                pr_debug("problem processing %d event, skipping it.\n",
 
 static int process_synthesized_event(struct perf_event_ops *ops,
                                     union perf_event *event,
                                     struct perf_sample *sample __used,
-                                    struct perf_session *self __used)
+                                    struct machine *machine __used)
 {
        struct perf_record *rec = container_of(ops, struct perf_record, ops);
        write_output(rec, event, event->header.size);
 {
        int err;
        struct perf_event_ops *ops = data;
-       struct perf_record *rec = container_of(ops, struct perf_record, ops);
-       struct perf_session *psession = rec->session;
 
        if (machine__is_host(machine))
                return;
         *in module instead of in guest kernel.
         */
        err = perf_event__synthesize_modules(ops, process_synthesized_event,
-                                            psession, machine);
+                                            machine);
        if (err < 0)
                pr_err("Couldn't record guest kernel [%d]'s reference"
                       " relocation symbol.\n", machine->pid);
         * have no _text sometimes.
         */
        err = perf_event__synthesize_kernel_mmap(ops, process_synthesized_event,
-                                                psession, machine, "_text");
+                                                machine, "_text");
        if (err < 0)
                err = perf_event__synthesize_kernel_mmap(ops, process_synthesized_event,
-                                                        psession, machine,
-                                                        "_stext");
+                                                        machine, "_stext");
        if (err < 0)
                pr_err("Couldn't record guest kernel [%d]'s reference"
                       " relocation symbol.\n", machine->pid);
 
        rec->post_processing_offset = lseek(output, 0, SEEK_CUR);
 
+       machine = perf_session__find_host_machine(session);
+       if (!machine) {
+               pr_err("Couldn't find native kernel information.\n");
+               return -1;
+       }
+
        if (opts->pipe_output) {
                err = perf_event__synthesize_attrs(ops, session,
                                                   process_synthesized_event);
                }
 
                err = perf_event__synthesize_event_types(ops, process_synthesized_event,
-                                                        session);
+                                                        machine);
                if (err < 0) {
                        pr_err("Couldn't synthesize event_types.\n");
                        return err;
                         * propagate errors that now are calling die()
                         */
                        err = perf_event__synthesize_tracing_data(ops, output, evsel_list,
-                                                                 process_synthesized_event,
-                                                                 session);
+                                                                 process_synthesized_event);
                        if (err <= 0) {
                                pr_err("Couldn't record tracing data.\n");
                                return err;
                }
        }
 
-       machine = perf_session__find_host_machine(session);
-       if (!machine) {
-               pr_err("Couldn't find native kernel information.\n");
-               return -1;
-       }
-
        err = perf_event__synthesize_kernel_mmap(ops, process_synthesized_event,
-                                                session, machine, "_text");
+                                                machine, "_text");
        if (err < 0)
                err = perf_event__synthesize_kernel_mmap(ops, process_synthesized_event,
-                                                        session, machine, "_stext");
+                                                        machine, "_stext");
        if (err < 0)
                pr_err("Couldn't record kernel reference relocation symbol\n"
                       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
                       "Check /proc/kallsyms permission or run as root.\n");
 
        err = perf_event__synthesize_modules(ops, process_synthesized_event,
-                                            session, machine);
+                                            machine);
        if (err < 0)
                pr_err("Couldn't record kernel module information.\n"
                       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
        if (!opts->system_wide)
                perf_event__synthesize_thread_map(ops, evsel_list->threads,
                                                  process_synthesized_event,
-                                                 session);
+                                                 machine);
        else
                perf_event__synthesize_threads(ops, process_synthesized_event,
-                                              session);
+                                              machine);
 
        if (rec->realtime_prio) {
                struct sched_param param;
 
        DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
 };
 
-static int perf_session__add_hist_entry(struct perf_session *session,
-                                       struct addr_location *al,
-                                       struct perf_sample *sample,
-                                       struct perf_evsel *evsel)
+static int perf_evsel__add_hist_entry(struct perf_evsel *evsel,
+                                     struct addr_location *al,
+                                     struct perf_sample *sample,
+                                     struct machine *machine)
 {
        struct symbol *parent = NULL;
        int err = 0;
        struct hist_entry *he;
 
        if ((sort__has_parent || symbol_conf.use_callchain) && sample->callchain) {
-               err = perf_session__resolve_callchain(session, evsel, al->thread,
-                                                     sample->callchain, &parent);
+               err = machine__resolve_callchain(machine, evsel, al->thread,
+                                                sample->callchain, &parent);
                if (err)
                        return err;
        }
                                union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
        struct perf_report *rep = container_of(ops, struct perf_report, ops);
        struct addr_location al;
 
-       if (perf_event__preprocess_sample(event, session, &al, sample,
+       if (perf_event__preprocess_sample(event, machine, &al, sample,
                                          rep->annotate_init) < 0) {
                fprintf(stderr, "problem processing %d event, skipping it.\n",
                        event->header.type);
        if (al.map != NULL)
                al.map->dso->hit = 1;
 
-       if (perf_session__add_hist_entry(session, &al, sample, evsel)) {
+       if (perf_evsel__add_hist_entry(evsel, &al, sample, machine)) {
                pr_debug("problem incrementing symbol period, skipping event\n");
                return -1;
        }
 static int process_read_event(struct perf_event_ops *ops,
                              union perf_event *event,
                              struct perf_sample *sample __used,
-                             struct perf_session *session)
+                             struct perf_evsel *evsel,
+                             struct machine *machine __used)
 {
        struct perf_report *rep = container_of(ops, struct perf_report, ops);
-       struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist,
-                                                        event->read.id);
+
        if (rep->show_threads) {
                const char *name = evsel ? event_name(evsel) : "unknown";
                perf_read_values_add_value(&rep->show_threads_values,
 
 
 struct trace_sched_handler {
        void (*switch_event)(struct trace_switch_event *,
-                            struct perf_session *,
+                            struct machine *,
                             struct event *,
                             int cpu,
                             u64 timestamp,
                             struct thread *thread);
 
        void (*runtime_event)(struct trace_runtime_event *,
-                             struct perf_session *,
+                             struct machine *,
                              struct event *,
                              int cpu,
                              u64 timestamp,
                              struct thread *thread);
 
        void (*wakeup_event)(struct trace_wakeup_event *,
-                            struct perf_session *,
+                            struct machine *,
                             struct event *,
                             int cpu,
                             u64 timestamp,
                           struct thread *thread);
 
        void (*migrate_task_event)(struct trace_migrate_task_event *,
-                          struct perf_session *session,
+                          struct machine *machine,
                           struct event *,
                           int cpu,
                           u64 timestamp,
 
 static void
 replay_wakeup_event(struct trace_wakeup_event *wakeup_event,
-                   struct perf_session *session __used,
+                   struct machine *machine __used,
                    struct event *event,
                    int cpu __used,
                    u64 timestamp __used,
 
 static void
 replay_switch_event(struct trace_switch_event *switch_event,
-                   struct perf_session *session __used,
+                   struct machine *machine __used,
                    struct event *event,
                    int cpu,
                    u64 timestamp,
 
 static void
 latency_switch_event(struct trace_switch_event *switch_event,
-                    struct perf_session *session,
+                    struct machine *machine,
                     struct event *event __used,
                     int cpu,
                     u64 timestamp,
                die("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 
 
-       sched_out = perf_session__findnew(session, switch_event->prev_pid);
-       sched_in = perf_session__findnew(session, switch_event->next_pid);
+       sched_out = machine__findnew_thread(machine, switch_event->prev_pid);
+       sched_in = machine__findnew_thread(machine, switch_event->next_pid);
 
        out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
        if (!out_events) {
 
 static void
 latency_runtime_event(struct trace_runtime_event *runtime_event,
-                    struct perf_session *session,
+                    struct machine *machine,
                     struct event *event __used,
                     int cpu,
                     u64 timestamp,
                     struct thread *this_thread __used)
 {
-       struct thread *thread = perf_session__findnew(session, runtime_event->pid);
+       struct thread *thread = machine__findnew_thread(machine, runtime_event->pid);
        struct work_atoms *atoms = thread_atoms_search(&atom_root, thread, &cmp_pid);
 
        BUG_ON(cpu >= MAX_CPUS || cpu < 0);
 
 static void
 latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
-                    struct perf_session *session,
+                    struct machine *machine,
                     struct event *__event __used,
                     int cpu __used,
                     u64 timestamp,
        if (!wakeup_event->success)
                return;
 
-       wakee = perf_session__findnew(session, wakeup_event->pid);
+       wakee = machine__findnew_thread(machine, wakeup_event->pid);
        atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
        if (!atoms) {
                thread_atoms_insert(wakee);
 
 static void
 latency_migrate_task_event(struct trace_migrate_task_event *migrate_task_event,
-                    struct perf_session *session,
+                    struct machine *machine,
                     struct event *__event __used,
                     int cpu __used,
                     u64 timestamp,
        if (profile_cpu == -1)
                return;
 
-       migrant = perf_session__findnew(session, migrate_task_event->pid);
+       migrant = machine__findnew_thread(machine, migrate_task_event->pid);
        atoms = thread_atoms_search(&atom_root, migrant, &cmp_pid);
        if (!atoms) {
                thread_atoms_insert(migrant);
 static struct trace_sched_handler *trace_handler;
 
 static void
-process_sched_wakeup_event(void *data, struct perf_session *session,
+process_sched_wakeup_event(void *data, struct machine *machine,
                           struct event *event,
                           int cpu __used,
                           u64 timestamp __used,
        FILL_FIELD(wakeup_event, cpu, event, data);
 
        if (trace_handler->wakeup_event)
-               trace_handler->wakeup_event(&wakeup_event, session, event,
+               trace_handler->wakeup_event(&wakeup_event, machine, event,
                                            cpu, timestamp, thread);
 }
 
 
 static void
 map_switch_event(struct trace_switch_event *switch_event,
-                struct perf_session *session,
+                struct machine *machine,
                 struct event *event __used,
                 int this_cpu,
                 u64 timestamp,
                die("hm, delta: %" PRIu64 " < 0 ?\n", delta);
 
 
-       sched_out = perf_session__findnew(session, switch_event->prev_pid);
-       sched_in = perf_session__findnew(session, switch_event->next_pid);
+       sched_out = machine__findnew_thread(machine, switch_event->prev_pid);
+       sched_in = machine__findnew_thread(machine, switch_event->next_pid);
 
        curr_thread[this_cpu] = sched_in;
 
 
 
 static void
-process_sched_switch_event(void *data, struct perf_session *session,
+process_sched_switch_event(void *data, struct machine *machine,
                           struct event *event,
                           int this_cpu,
                           u64 timestamp __used,
                        nr_context_switch_bugs++;
        }
        if (trace_handler->switch_event)
-               trace_handler->switch_event(&switch_event, session, event,
+               trace_handler->switch_event(&switch_event, machine, event,
                                            this_cpu, timestamp, thread);
 
        curr_pid[this_cpu] = switch_event.next_pid;
 }
 
 static void
-process_sched_runtime_event(void *data, struct perf_session *session,
+process_sched_runtime_event(void *data, struct machine *machine,
                           struct event *event,
                           int cpu __used,
                           u64 timestamp __used,
        FILL_FIELD(runtime_event, vruntime, event, data);
 
        if (trace_handler->runtime_event)
-               trace_handler->runtime_event(&runtime_event, session, event, cpu, timestamp, thread);
+               trace_handler->runtime_event(&runtime_event, machine, event, cpu, timestamp, thread);
 }
 
 static void
 }
 
 static void
-process_sched_migrate_task_event(void *data, struct perf_session *session,
+process_sched_migrate_task_event(void *data, struct machine *machine,
                           struct event *event,
                           int cpu __used,
                           u64 timestamp __used,
        FILL_FIELD(migrate_task_event, cpu, event, data);
 
        if (trace_handler->migrate_task_event)
-               trace_handler->migrate_task_event(&migrate_task_event, session,
+               trace_handler->migrate_task_event(&migrate_task_event, machine,
                                                 event, cpu, timestamp, thread);
 }
 
 static void process_raw_event(union perf_event *raw_event __used,
-                             struct perf_session *session, void *data, int cpu,
+                             struct machine *machine, void *data, int cpu,
                              u64 timestamp, struct thread *thread)
 {
        struct event *event;
        event = trace_find_event(type);
 
        if (!strcmp(event->name, "sched_switch"))
-               process_sched_switch_event(data, session, event, cpu, timestamp, thread);
+               process_sched_switch_event(data, machine, event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_stat_runtime"))
-               process_sched_runtime_event(data, session, event, cpu, timestamp, thread);
+               process_sched_runtime_event(data, machine, event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_wakeup"))
-               process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
+               process_sched_wakeup_event(data, machine, event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_wakeup_new"))
-               process_sched_wakeup_event(data, session, event, cpu, timestamp, thread);
+               process_sched_wakeup_event(data, machine, event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_process_fork"))
                process_sched_fork_event(data, event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_process_exit"))
                process_sched_exit_event(event, cpu, timestamp, thread);
        if (!strcmp(event->name, "sched_migrate_task"))
-               process_sched_migrate_task_event(data, session, event, cpu, timestamp, thread);
+               process_sched_migrate_task_event(data, machine, event, cpu, timestamp, thread);
 }
 
 static int process_sample_event(struct perf_event_ops *ops __used,
                                union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
        struct thread *thread;
 
        if (!(evsel->attr.sample_type & PERF_SAMPLE_RAW))
                return 0;
 
-       thread = perf_session__findnew(session, sample->pid);
+       thread = machine__findnew_thread(machine, sample->pid);
        if (thread == NULL) {
                pr_debug("problem processing %d event, skipping it.\n",
                         event->header.type);
        if (profile_cpu != -1 && profile_cpu != (int)sample->cpu)
                return 0;
 
-       process_raw_event(event, session, sample->raw_data, sample->cpu,
+       process_raw_event(event, machine, sample->raw_data, sample->cpu,
                          sample->time, thread);
 
        return 0;
 
 
 static void print_sample_addr(union perf_event *event,
                          struct perf_sample *sample,
-                         struct perf_session *session,
+                         struct machine *machine,
                          struct thread *thread,
                          struct perf_event_attr *attr)
 {
        if (!sample_addr_correlates_sym(attr))
                return;
 
-       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
-                             event->ip.pid, sample->addr, &al);
+       thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
+                             sample->addr, &al);
        if (!al.map)
-               thread__find_addr_map(thread, session, cpumode, MAP__VARIABLE,
-                                     event->ip.pid, sample->addr, &al);
+               thread__find_addr_map(thread, machine, cpumode, MAP__VARIABLE,
+                                     sample->addr, &al);
 
        al.cpu = sample->cpu;
        al.sym = NULL;
 static void process_event(union perf_event *event __unused,
                          struct perf_sample *sample,
                          struct perf_evsel *evsel,
-                         struct perf_session *session,
+                         struct machine *machine,
                          struct thread *thread)
 {
        struct perf_event_attr *attr = &evsel->attr;
                                  sample->raw_size);
 
        if (PRINT_FIELD(ADDR))
-               print_sample_addr(event, sample, session, thread, attr);
+               print_sample_addr(event, sample, machine, thread, attr);
 
        if (PRINT_FIELD(IP)) {
                if (!symbol_conf.use_callchain)
                        printf(" ");
                else
                        printf("\n");
-               perf_session__print_ip(event, evsel, sample, session,
-                                             PRINT_FIELD(SYM), PRINT_FIELD(DSO));
+               perf_event__print_ip(event, sample, machine, evsel,
+                                    PRINT_FIELD(SYM), PRINT_FIELD(DSO));
        }
 
        printf("\n");
                                union perf_event *event,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel,
-                               struct perf_session *session)
+                               struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(session, event->ip.pid);
+       struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 
        if (thread == NULL) {
                pr_debug("problem processing %d event, skipping it.\n",
        if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
                return 0;
 
-       scripting_ops->process_event(event, sample, evsel, session, thread);
+       scripting_ops->process_event(event, sample, evsel, machine, thread);
 
-       session->hists.stats.total_period += sample->period;
+       evsel->hists.stats.total_period += sample->period;
        return 0;
 }
 
 
 static int process_comm_event(struct perf_event_ops *ops __used,
                              union perf_event *event,
                              struct perf_sample *sample __used,
-                             struct perf_session *session __used)
+                             struct machine *machine __used)
 {
        pid_set_comm(event->comm.tid, event->comm.comm);
        return 0;
 static int process_fork_event(struct perf_event_ops *ops __used,
                              union perf_event *event,
                              struct perf_sample *sample __used,
-                             struct perf_session *session __used)
+                             struct machine *machine __used)
 {
        pid_fork(event->fork.pid, event->fork.ppid, event->fork.time);
        return 0;
 static int process_exit_event(struct perf_event_ops *ops __used,
                              union perf_event *event,
                              struct perf_sample *sample __used,
-                             struct perf_session *session __used)
+                             struct machine *machine __used)
 {
        pid_exit(event->fork.pid, event->fork.time);
        return 0;
                                union perf_event *event __used,
                                struct perf_sample *sample,
                                struct perf_evsel *evsel,
-                               struct perf_session *session __used)
+                               struct machine *machine __used)
 {
        struct trace_entry *te;
 
 
 
 static const char              CONSOLE_CLEAR[] = "\e[H\e[2J";
 
-static struct hist_entry *
-       perf_session__add_hist_entry(struct perf_session *session,
-                                    struct addr_location *al,
-                                    struct perf_sample *sample,
-                                    struct perf_evsel *evsel)
+static struct hist_entry *perf_evsel__add_hist_entry(struct perf_evsel *evsel,
+                                                    struct addr_location *al,
+                                                    struct perf_sample *sample)
 {
        struct hist_entry *he;
 
        if (he == NULL)
                return NULL;
 
-       session->hists.stats.total_period += sample->period;
+       evsel->hists.stats.total_period += sample->period;
        hists__inc_nr_events(&evsel->hists, PERF_RECORD_SAMPLE);
        return he;
 }
 static void perf_event__process_sample(const union perf_event *event,
                                       struct perf_evsel *evsel,
                                       struct perf_sample *sample,
-                                      struct perf_session *session)
+                                      struct machine *machine)
 {
        struct symbol *parent = NULL;
        u64 ip = event->ip.ip;
        struct addr_location al;
-       struct machine *machine;
        int err;
-       u8 origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
-
-       ++top.samples;
-
-       switch (origin) {
-       case PERF_RECORD_MISC_USER:
-               ++top.us_samples;
-               if (top.hide_user_symbols)
-                       return;
-               machine = perf_session__find_host_machine(session);
-               break;
-       case PERF_RECORD_MISC_KERNEL:
-               ++top.kernel_samples;
-               if (top.hide_kernel_symbols)
-                       return;
-               machine = perf_session__find_host_machine(session);
-               break;
-       case PERF_RECORD_MISC_GUEST_KERNEL:
-               ++top.guest_kernel_samples;
-               machine = perf_session__find_machine(session, event->ip.pid);
-               break;
-       case PERF_RECORD_MISC_GUEST_USER:
-               ++top.guest_us_samples;
-               /*
-                * TODO: we don't process guest user from host side
-                * except simple counting.
-                */
-               return;
-       default:
-               return;
-       }
 
        if (!machine && perf_guest) {
                pr_err("Can't find guest [%d]'s kernel information\n",
        if (event->header.misc & PERF_RECORD_MISC_EXACT_IP)
                top.exact_samples++;
 
-       if (perf_event__preprocess_sample(event, session, &al, sample,
+       if (perf_event__preprocess_sample(event, machine, &al, sample,
                                          symbol_filter) < 0 ||
            al.filtered)
                return;
 
                if ((sort__has_parent || symbol_conf.use_callchain) &&
                    sample->callchain) {
-                       err = perf_session__resolve_callchain(session, evsel, al.thread,
-                                                             sample->callchain, &parent);
+                       err = machine__resolve_callchain(machine, evsel, al.thread,
+                                                        sample->callchain, &parent);
                        if (err)
                                return;
                }
 
-               he = perf_session__add_hist_entry(session, &al, sample, evsel);
+               he = perf_evsel__add_hist_entry(evsel, &al, sample);
                if (he == NULL) {
                        pr_err("Problem incrementing symbol period, skipping event\n");
                        return;
        struct perf_sample sample;
        struct perf_evsel *evsel;
        union perf_event *event;
+       struct machine *machine;
+       u8 origin;
        int ret;
 
        while ((event = perf_evlist__mmap_read(top.evlist, idx)) != NULL) {
                evsel = perf_evlist__id2evsel(self->evlist, sample.id);
                assert(evsel != NULL);
 
+               origin = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+
                if (event->header.type == PERF_RECORD_SAMPLE)
-                       perf_event__process_sample(event, evsel, &sample, self);
+                       ++top.samples;
+
+               switch (origin) {
+               case PERF_RECORD_MISC_USER:
+                       ++top.us_samples;
+                       if (top.hide_user_symbols)
+                               continue;
+                       machine = perf_session__find_host_machine(self);
+                       break;
+               case PERF_RECORD_MISC_KERNEL:
+                       ++top.kernel_samples;
+                       if (top.hide_kernel_symbols)
+                               continue;
+                       machine = perf_session__find_host_machine(self);
+                       break;
+               case PERF_RECORD_MISC_GUEST_KERNEL:
+                       ++top.guest_kernel_samples;
+                       machine = perf_session__find_machine(self, event->ip.pid);
+                       break;
+               case PERF_RECORD_MISC_GUEST_USER:
+                       ++top.guest_us_samples;
+                       /*
+                        * TODO: we don't process guest user from host side
+                        * except simple counting.
+                        */
+                       /* Fall thru */
+               default:
+                       continue;
+               }
+
+
+               if (event->header.type == PERF_RECORD_SAMPLE)
+                       perf_event__process_sample(event, evsel, &sample, machine);
                else if (event->header.type < PERF_RECORD_MAX) {
                        hists__inc_nr_events(&evsel->hists, event->header.type);
-                       perf_event__process(&top.ops, event, &sample, self);
+                       perf_event__process(&top.ops, event, &sample, machine);
                } else
                        ++self->hists.stats.nr_unknown_events;
        }
 
        if (top.target_tid != -1)
                perf_event__synthesize_thread_map(&top.ops, top.evlist->threads,
-                                                 perf_event__process, top.session);
+                                                 perf_event__process,
+                                                 &top.session->host_machine);
        else
-               perf_event__synthesize_threads(&top.ops, perf_event__process, top.session);
-
+               perf_event__synthesize_threads(&top.ops, perf_event__process,
+                                              &top.session->host_machine);
        start_counters(top.evlist);
        top.session->evlist = top.evlist;
        perf_session__update_sample_type(top.session);
 
                                  union perf_event *event,
                                  struct perf_sample *sample __used,
                                  struct perf_evsel *evsel __used,
-                                 struct perf_session *session)
+                                 struct machine *machine)
 {
        struct addr_location al;
        u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
-       struct thread *thread = perf_session__findnew(session, event->ip.pid);
+       struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 
        if (thread == NULL) {
                pr_err("problem processing %d event, skipping it.\n",
                return -1;
        }
 
-       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
-                             event->ip.pid, event->ip.ip, &al);
+       thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
+                             event->ip.ip, &al);
 
        if (al.map != NULL)
                al.map->dso->hit = 1;
 static int perf_event__exit_del_thread(struct perf_event_ops *ops __used,
                                       union perf_event *event,
                                       struct perf_sample *sample __used,
-                                      struct perf_session *session)
+                                      struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(session, event->fork.tid);
+       struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
 
        dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
                    event->fork.ppid, event->fork.ptid);
 
        if (thread) {
-               rb_erase(&thread->rb_node, &session->host_machine.threads);
-               session->host_machine.last_match = NULL;
+               rb_erase(&thread->rb_node, &machine->threads);
+               machine->last_match = NULL;
                thread__delete(thread);
        }
 
 
 #include <linux/types.h>
 #include "event.h"
 #include "debug.h"
-#include "session.h"
 #include "sort.h"
 #include "string.h"
 #include "strlist.h"
 static pid_t perf_event__synthesize_comm(struct perf_event_ops *ops,
                                         union perf_event *event, pid_t pid,
                                         int full, perf_event__handler_t process,
-                                        struct perf_session *session)
+                                        struct machine *machine)
 {
        char filename[PATH_MAX];
        char bf[BUFSIZ];
 
        event->comm.header.type = PERF_RECORD_COMM;
        size = ALIGN(size, sizeof(u64));
-       memset(event->comm.comm + size, 0, session->id_hdr_size);
+       memset(event->comm.comm + size, 0, machine->id_hdr_size);
        event->comm.header.size = (sizeof(event->comm) -
                                (sizeof(event->comm.comm) - size) +
-                               session->id_hdr_size);
+                               machine->id_hdr_size);
        if (!full) {
                event->comm.tid = pid;
 
-               process(ops, event, &synth_sample, session);
+               process(ops, event, &synth_sample, machine);
                goto out;
        }
 
 
                event->comm.tid = pid;
 
-               process(ops, event, &synth_sample, session);
+               process(ops, event, &synth_sample, machine);
        }
 
        closedir(tasks);
                                              union perf_event *event,
                                              pid_t pid, pid_t tgid,
                                              perf_event__handler_t process,
-                                             struct perf_session *session)
+                                             struct machine *machine)
 {
        char filename[PATH_MAX];
        FILE *fp;
                        event->mmap.len -= event->mmap.start;
                        event->mmap.header.size = (sizeof(event->mmap) -
                                                (sizeof(event->mmap.filename) - size));
-                       memset(event->mmap.filename + size, 0, session->id_hdr_size);
-                       event->mmap.header.size += session->id_hdr_size;
+                       memset(event->mmap.filename + size, 0, machine->id_hdr_size);
+                       event->mmap.header.size += machine->id_hdr_size;
                        event->mmap.pid = tgid;
                        event->mmap.tid = pid;
 
-                       process(ops, event, &synth_sample, session);
+                       process(ops, event, &synth_sample, machine);
                }
        }
 
 
 int perf_event__synthesize_modules(struct perf_event_ops *ops,
                                   perf_event__handler_t process,
-                                  struct perf_session *session,
                                   struct machine *machine)
 {
        struct rb_node *nd;
        struct map_groups *kmaps = &machine->kmaps;
        union perf_event *event = zalloc((sizeof(event->mmap) +
-                                         session->id_hdr_size));
+                                         machine->id_hdr_size));
        if (event == NULL) {
                pr_debug("Not enough memory synthesizing mmap event "
                         "for kernel modules\n");
                event->mmap.header.type = PERF_RECORD_MMAP;
                event->mmap.header.size = (sizeof(event->mmap) -
                                        (sizeof(event->mmap.filename) - size));
-               memset(event->mmap.filename + size, 0, session->id_hdr_size);
-               event->mmap.header.size += session->id_hdr_size;
+               memset(event->mmap.filename + size, 0, machine->id_hdr_size);
+               event->mmap.header.size += machine->id_hdr_size;
                event->mmap.start = pos->start;
                event->mmap.len   = pos->end - pos->start;
                event->mmap.pid   = machine->pid;
 
                memcpy(event->mmap.filename, pos->dso->long_name,
                       pos->dso->long_name_len + 1);
-               process(ops, event, &synth_sample, session);
+               process(ops, event, &synth_sample, machine);
        }
 
        free(event);
                                      union perf_event *mmap_event,
                                      pid_t pid, perf_event__handler_t process,
                                      struct perf_event_ops *ops,
-                                     struct perf_session *session)
+                                     struct machine *machine)
 {
-       pid_t tgid = perf_event__synthesize_comm(ops, comm_event, pid, 1, process,
-                                           session);
+       pid_t tgid = perf_event__synthesize_comm(ops, comm_event, pid, 1,
+                                                process, machine);
        if (tgid == -1)
                return -1;
        return perf_event__synthesize_mmap_events(ops, mmap_event, pid, tgid,
-                                            process, session);
+                                                 process, machine);
 }
 
 int perf_event__synthesize_thread_map(struct perf_event_ops *ops,
                                      struct thread_map *threads,
                                      perf_event__handler_t process,
-                                     struct perf_session *session)
+                                     struct machine *machine)
 {
        union perf_event *comm_event, *mmap_event;
        int err = -1, thread;
 
-       comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
+       comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
        if (comm_event == NULL)
                goto out;
 
-       mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
+       mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
        if (mmap_event == NULL)
                goto out_free_comm;
 
        for (thread = 0; thread < threads->nr; ++thread) {
                if (__event__synthesize_thread(comm_event, mmap_event,
                                               threads->map[thread],
-                                              process, ops, session)) {
+                                              process, ops, machine)) {
                        err = -1;
                        break;
                }
 
 int perf_event__synthesize_threads(struct perf_event_ops *ops,
                                   perf_event__handler_t process,
-                                  struct perf_session *session)
+                                  struct machine *machine)
 {
        DIR *proc;
        struct dirent dirent, *next;
        union perf_event *comm_event, *mmap_event;
        int err = -1;
 
-       comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
+       comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
        if (comm_event == NULL)
                goto out;
 
-       mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
+       mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
        if (mmap_event == NULL)
                goto out_free_comm;
 
                        continue;
 
                __event__synthesize_thread(comm_event, mmap_event, pid,
-                                          process, ops, session);
+                                          process, ops, machine);
        }
 
        closedir(proc);
 
 int perf_event__synthesize_kernel_mmap(struct perf_event_ops *ops,
                                       perf_event__handler_t process,
-                                      struct perf_session *session,
                                       struct machine *machine,
                                       const char *symbol_name)
 {
         */
        struct process_symbol_args args = { .name = symbol_name, };
        union perf_event *event = zalloc((sizeof(event->mmap) +
-                                         session->id_hdr_size));
+                                         machine->id_hdr_size));
        if (event == NULL) {
                pr_debug("Not enough memory synthesizing mmap event "
                         "for kernel modules\n");
        size = ALIGN(size, sizeof(u64));
        event->mmap.header.type = PERF_RECORD_MMAP;
        event->mmap.header.size = (sizeof(event->mmap) -
-                       (sizeof(event->mmap.filename) - size) + session->id_hdr_size);
+                       (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
        event->mmap.pgoff = args.start;
        event->mmap.start = map->start;
        event->mmap.len   = map->end - event->mmap.start;
        event->mmap.pid   = machine->pid;
 
-       err = process(ops, event, &synth_sample, session);
+       err = process(ops, event, &synth_sample, machine);
        free(event);
 
        return err;
 int perf_event__process_comm(struct perf_event_ops *ops __used,
                             union perf_event *event,
                             struct perf_sample *sample __used,
-                            struct perf_session *session)
+                            struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(session, event->comm.tid);
+       struct thread *thread = machine__findnew_thread(machine, event->comm.tid);
 
        dump_printf(": %s:%d\n", event->comm.comm, event->comm.tid);
 
 int perf_event__process_lost(struct perf_event_ops *ops __used,
                             union perf_event *event,
                             struct perf_sample *sample __used,
-                            struct perf_session *session)
+                            struct machine *machine __used)
 {
        dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
                    event->lost.id, event->lost.lost);
-       session->hists.stats.total_lost += event->lost.lost;
        return 0;
 }
 
 
 static int perf_event__process_kernel_mmap(struct perf_event_ops *ops __used,
                                           union perf_event *event,
-                                          struct perf_session *session)
+                                          struct machine *machine)
 {
        struct map *map;
        char kmmap_prefix[PATH_MAX];
-       struct machine *machine;
        enum dso_kernel_type kernel_type;
        bool is_kernel_mmap;
 
-       machine = perf_session__findnew_machine(session, event->mmap.pid);
-       if (!machine) {
-               pr_err("Can't find id %d's machine\n", event->mmap.pid);
-               goto out_problem;
-       }
-
        machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
        if (machine__is_host(machine))
                kernel_type = DSO_TYPE_KERNEL;
                 * time /proc/sys/kernel/kptr_restrict was non zero.
                 */
                if (event->mmap.pgoff != 0) {
-                       perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
-                                                                symbol_name,
-                                                                event->mmap.pgoff);
+                       maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
+                                                        symbol_name,
+                                                        event->mmap.pgoff);
                }
 
                if (machine__is_default_guest(machine)) {
 int perf_event__process_mmap(struct perf_event_ops *ops,
                             union perf_event *event,
                             struct perf_sample *sample __used,
-                            struct perf_session *session)
+                            struct machine *machine)
 {
-       struct machine *machine;
        struct thread *thread;
        struct map *map;
        u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 
        if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
            cpumode == PERF_RECORD_MISC_KERNEL) {
-               ret = perf_event__process_kernel_mmap(ops, event, session);
+               ret = perf_event__process_kernel_mmap(ops, event, machine);
                if (ret < 0)
                        goto out_problem;
                return 0;
        }
 
-       machine = perf_session__find_host_machine(session);
-       if (machine == NULL)
-               goto out_problem;
-       thread = perf_session__findnew(session, event->mmap.pid);
+       thread = machine__findnew_thread(machine, event->mmap.pid);
        if (thread == NULL)
                goto out_problem;
        map = map__new(&machine->user_dsos, event->mmap.start,
 int perf_event__process_task(struct perf_event_ops *ops __used,
                             union perf_event *event,
                             struct perf_sample *sample __used,
-                            struct perf_session *session)
+                             struct machine *machine)
 {
-       struct thread *thread = perf_session__findnew(session, event->fork.tid);
-       struct thread *parent = perf_session__findnew(session, event->fork.ptid);
+       struct thread *thread = machine__findnew_thread(machine, event->fork.tid);
+       struct thread *parent = machine__findnew_thread(machine, event->fork.ptid);
 
        dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
                    event->fork.ppid, event->fork.ptid);
 
        if (event->header.type == PERF_RECORD_EXIT) {
-               perf_session__remove_thread(session, thread);
+               machine__remove_thread(machine, thread);
                return 0;
        }
 
 }
 
 int perf_event__process(struct perf_event_ops *ops, union perf_event *event,
-                       struct perf_sample *sample, struct perf_session *session)
+                       struct perf_sample *sample, struct machine *machine)
 {
        switch (event->header.type) {
        case PERF_RECORD_COMM:
-               perf_event__process_comm(ops, event, sample, session);
+               perf_event__process_comm(ops, event, sample, machine);
                break;
        case PERF_RECORD_MMAP:
-               perf_event__process_mmap(ops, event, sample, session);
+               perf_event__process_mmap(ops, event, sample, machine);
                break;
        case PERF_RECORD_FORK:
        case PERF_RECORD_EXIT:
-               perf_event__process_task(ops, event, sample, session);
+               perf_event__process_task(ops, event, sample, machine);
                break;
        case PERF_RECORD_LOST:
-               perf_event__process_lost(ops, event, sample, session);
+               perf_event__process_lost(ops, event, sample, machine);
        default:
                break;
        }
 }
 
 void thread__find_addr_map(struct thread *self,
-                          struct perf_session *session, u8 cpumode,
-                          enum map_type type, pid_t pid, u64 addr,
+                          struct machine *machine, u8 cpumode,
+                          enum map_type type, u64 addr,
                           struct addr_location *al)
 {
        struct map_groups *mg = &self->mg;
-       struct machine *machine = NULL;
 
        al->thread = self;
        al->addr = addr;
        al->cpumode = cpumode;
        al->filtered = false;
 
+       if (machine == NULL) {
+               al->map = NULL;
+               return;
+       }
+
        if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
                al->level = 'k';
-               machine = perf_session__find_host_machine(session);
-               if (machine == NULL) {
-                       al->map = NULL;
-                       return;
-               }
                mg = &machine->kmaps;
        } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
                al->level = '.';
-               machine = perf_session__find_host_machine(session);
        } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
                al->level = 'g';
-               machine = perf_session__find_machine(session, pid);
-               if (machine == NULL) {
-                       al->map = NULL;
-                       return;
-               }
                mg = &machine->kmaps;
        } else {
                /*
                al->addr = al->map->map_ip(al->map, al->addr);
 }
 
-void thread__find_addr_location(struct thread *self,
-                               struct perf_session *session, u8 cpumode,
-                               enum map_type type, pid_t pid, u64 addr,
+void thread__find_addr_location(struct thread *thread, struct machine *machine,
+                               u8 cpumode, enum map_type type, u64 addr,
                                struct addr_location *al,
                                symbol_filter_t filter)
 {
-       thread__find_addr_map(self, session, cpumode, type, pid, addr, al);
+       thread__find_addr_map(thread, machine, cpumode, type, addr, al);
        if (al->map != NULL)
                al->sym = map__find_symbol(al->map, al->addr, filter);
        else
 }
 
 int perf_event__preprocess_sample(const union perf_event *event,
-                                 struct perf_session *session,
+                                 struct machine *machine,
                                  struct addr_location *al,
                                  struct perf_sample *sample,
                                  symbol_filter_t filter)
 {
        u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
-       struct thread *thread = perf_session__findnew(session, event->ip.pid);
+       struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 
        if (thread == NULL)
                return -1;
 
        dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
        /*
-        * Have we already created the kernel maps for the host machine?
+        * Have we already created the kernel maps for this machine?
         *
         * This should have happened earlier, when we processed the kernel MMAP
         * events, but for older perf.data files there was no such thing, so do
         * it now.
         */
        if (cpumode == PERF_RECORD_MISC_KERNEL &&
-           session->host_machine.vmlinux_maps[MAP__FUNCTION] == NULL)
-               machine__create_kernel_maps(&session->host_machine);
+           machine->vmlinux_maps[MAP__FUNCTION] == NULL)
+               machine__create_kernel_maps(machine);
 
-       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
-                             event->ip.pid, event->ip.ip, al);
+       thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
+                             event->ip.ip, al);
        dump_printf(" ...... dso: %s\n",
                    al->map ? al->map->dso->long_name :
                        al->level == 'H' ? "[hypervisor]" : "<not found>");
 
 void perf_event__print_totals(void);
 
 struct perf_event_ops;
-struct perf_session;
 struct thread_map;
 
 typedef int (*perf_event__handler_t)(struct perf_event_ops *ops,
                                     union perf_event *event,
                                     struct perf_sample *sample,
-                                     struct perf_session *session);
+                                    struct machine *machine);
 
 int perf_event__synthesize_thread_map(struct perf_event_ops *ops,
                                      struct thread_map *threads,
                                      perf_event__handler_t process,
-                                     struct perf_session *session);
+                                     struct machine *machine);
 int perf_event__synthesize_threads(struct perf_event_ops *ops,
                                   perf_event__handler_t process,
-                                  struct perf_session *session);
+                                  struct machine *machine);
 int perf_event__synthesize_kernel_mmap(struct perf_event_ops *ops,
                                       perf_event__handler_t process,
-                                      struct perf_session *session,
                                       struct machine *machine,
                                       const char *symbol_name);
 
 int perf_event__synthesize_modules(struct perf_event_ops *ops,
                                   perf_event__handler_t process,
-                                  struct perf_session *session,
                                   struct machine *machine);
 
 int perf_event__process_comm(struct perf_event_ops *ops,
                             union perf_event *event,
                             struct perf_sample *sample,
-                            struct perf_session *session);
+                            struct machine *machine);
 int perf_event__process_lost(struct perf_event_ops *ops,
                             union perf_event *event,
                             struct perf_sample *sample,
-                            struct perf_session *session);
+                            struct machine *machine);
 int perf_event__process_mmap(struct perf_event_ops *ops,
                             union perf_event *event,
                             struct perf_sample *sample,
-                            struct perf_session *session);
+                            struct machine *machine);
 int perf_event__process_task(struct perf_event_ops *ops,
                             union perf_event *event,
                             struct perf_sample *sample,
-                            struct perf_session *session);
+                            struct machine *machine);
 int perf_event__process(struct perf_event_ops *ops,
                        union perf_event *event,
                        struct perf_sample *sample,
-                       struct perf_session *session);
+                       struct machine *machine);
 
 struct addr_location;
 int perf_event__preprocess_sample(const union perf_event *self,
-                                 struct perf_session *session,
+                                 struct machine *machine,
                                  struct addr_location *al,
                                  struct perf_sample *sample,
                                  symbol_filter_t filter);
 
 
 int perf_event__synthesize_attr(struct perf_event_ops *ops,
                                struct perf_event_attr *attr, u16 ids, u64 *id,
-                               perf_event__handler_t process,
-                               struct perf_session *session)
+                               perf_event__handler_t process)
 {
        union perf_event *ev;
        size_t size;
        ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
        ev->attr.header.size = size;
 
-       err = process(ops, ev, NULL, session);
+       err = process(ops, ev, NULL, NULL);
 
        free(ev);
 
 
        list_for_each_entry(attr, &session->evlist->entries, node) {
                err = perf_event__synthesize_attr(ops, &attr->attr, attr->ids,
-                                                 attr->id, process, session);
+                                                 attr->id, process);
                if (err) {
                        pr_debug("failed to create perf header attribute\n");
                        return err;
 int perf_event__synthesize_event_type(struct perf_event_ops *ops,
                                      u64 event_id, char *name,
                                      perf_event__handler_t process,
-                                     struct perf_session *session)
+                                     struct machine *machine)
 {
        union perf_event ev;
        size_t size = 0;
        ev.event_type.header.size = sizeof(ev.event_type) -
                (sizeof(ev.event_type.event_type.name) - size);
 
-       err = process(ops, &ev, NULL, session);
+       err = process(ops, &ev, NULL, machine);
 
        return err;
 }
 
 int perf_event__synthesize_event_types(struct perf_event_ops *ops,
                                       perf_event__handler_t process,
-                                      struct perf_session *session)
+                                      struct machine *machine)
 {
        struct perf_trace_event_type *type;
        int i, err = 0;
 
                err = perf_event__synthesize_event_type(ops, type->event_id,
                                                        type->name, process,
-                                                       session);
+                                                       machine);
                if (err) {
                        pr_debug("failed to create perf header event type\n");
                        return err;
 }
 
 int perf_event__process_event_type(struct perf_event_ops *ops __unused,
-                                  union perf_event *event,
-                                  struct perf_session *session __unused)
+                                  union perf_event *event)
 {
        if (perf_header__push_event(event->event_type.event_type.event_id,
                                    event->event_type.event_type.name) < 0)
 
 int perf_event__synthesize_tracing_data(struct perf_event_ops *ops, int fd,
                                        struct perf_evlist *evlist,
-                                        perf_event__handler_t process,
-                                  struct perf_session *session __unused)
+                                       perf_event__handler_t process)
 {
        union perf_event ev;
        struct tracing_data *tdata;
        ev.tracing_data.header.size = sizeof(ev.tracing_data);
        ev.tracing_data.size = aligned_size;
 
-       process(ops, &ev, NULL, session);
+       process(ops, &ev, NULL, NULL);
 
        /*
         * The put function will copy all the tracing data
 int perf_event__synthesize_build_id(struct perf_event_ops *ops,
                                    struct dso *pos, u16 misc,
                                    perf_event__handler_t process,
-                                   struct machine *machine,
-                                   struct perf_session *session)
+                                   struct machine *machine)
 {
        union perf_event ev;
        size_t len;
        ev.build_id.header.size = sizeof(ev.build_id) + len;
        memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
 
-       err = process(ops, &ev, NULL, session);
+       err = process(ops, &ev, NULL, machine);
 
        return err;
 }
 
 
 int perf_event__synthesize_attr(struct perf_event_ops *ops,
                                struct perf_event_attr *attr, u16 ids, u64 *id,
-                               perf_event__handler_t process,
-                               struct perf_session *session);
+                               perf_event__handler_t process);
 int perf_event__synthesize_attrs(struct perf_event_ops *ops,
                                 struct perf_session *session,
                                 perf_event__handler_t process);
 int perf_event__synthesize_event_type(struct perf_event_ops *ops,
                                      u64 event_id, char *name,
                                      perf_event__handler_t process,
-                                     struct perf_session *session);
+                                     struct machine *machine);
 int perf_event__synthesize_event_types(struct perf_event_ops *ops,
                                       perf_event__handler_t process,
-                                      struct perf_session *session);
+                                      struct machine *machine);
 int perf_event__process_event_type(struct perf_event_ops *ops,
-                                  union perf_event *event,
-                                  struct perf_session *session);
+                                  union perf_event *event);
 
 int perf_event__synthesize_tracing_data(struct perf_event_ops *ops,
                                        int fd, struct perf_evlist *evlist,
-                                       perf_event__handler_t process,
-                                       struct perf_session *session);
+                                       perf_event__handler_t process);
 int perf_event__process_tracing_data(union perf_event *event,
                                     struct perf_session *session);
 
 int perf_event__synthesize_build_id(struct perf_event_ops *ops,
                                    struct dso *pos, u16 misc,
                                    perf_event__handler_t process,
-                                   struct machine *machine,
-                                   struct perf_session *session);
+                                   struct machine *machine);
 int perf_event__process_build_id(struct perf_event_ops *ops,
                                 union perf_event *event,
                                 struct perf_session *session);
 
 extern const char *map_type__name[MAP__NR_TYPES];
 
 struct dso;
+struct ip_callchain;
 struct ref_reloc_sym;
 struct map_groups;
 struct machine;
+struct perf_evsel;
 
 struct map {
        union {
 struct machine {
        struct rb_node    rb_node;
        pid_t             pid;
+       u16               id_hdr_size;
        char              *root_dir;
        struct rb_root    threads;
        struct list_head  dead_threads;
 void machine__exit(struct machine *self);
 void machine__delete(struct machine *self);
 
+int machine__resolve_callchain(struct machine *machine,
+                              struct perf_evsel *evsel, struct thread *thread,
+                              struct ip_callchain *chain,
+                              struct symbol **parent);
+int maps__set_kallsyms_ref_reloc_sym(struct map **maps, const char *symbol_name,
+                                    u64 addr);
+
 /*
  * Default guest kernel is defined by parameter --guestkallsyms
  * and --guestmodules
 
 
 #include "../../perf.h"
 #include "../util.h"
+#include "../thread.h"
+#include "../event.h"
 #include "../trace-event.h"
 
 #include <EXTERN.h>
 static void perl_process_event(union perf_event *pevent __unused,
                               struct perf_sample *sample,
                               struct perf_evsel *evsel,
-                              struct perf_session *session __unused,
+                              struct machine *machine __unused,
                               struct thread *thread)
 {
        struct format_field *field;
 
 
 #include "../../perf.h"
 #include "../util.h"
+#include "../event.h"
+#include "../thread.h"
 #include "../trace-event.h"
 
 PyMODINIT_FUNC initperf_trace_context(void);
 static void python_process_event(union perf_event *pevent __unused,
                                 struct perf_sample *sample,
                                 struct perf_evsel *evsel __unused,
-                                struct perf_session *session __unused,
+                                struct machine *machine __unused,
                                 struct thread *thread)
 {
        PyObject *handler, *retval, *context, *t, *obj, *dict = NULL;
 
        self->sample_size = __perf_evsel__sample_size(self->sample_type);
        self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
        self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
+       self->host_machine.id_hdr_size = self->id_hdr_size;
 }
 
 int perf_session__create_kernel_maps(struct perf_session *self)
        return 0;
 }
 
-int perf_session__resolve_callchain(struct perf_session *self, struct perf_evsel *evsel,
-                                   struct thread *thread,
-                                   struct ip_callchain *chain,
-                                   struct symbol **parent)
+int machine__resolve_callchain(struct machine *self, struct perf_evsel *evsel,
+                              struct thread *thread,
+                              struct ip_callchain *chain,
+                              struct symbol **parent)
 {
        u8 cpumode = PERF_RECORD_MISC_USER;
        unsigned int i;
 
                al.filtered = false;
                thread__find_addr_location(thread, self, cpumode,
-                               MAP__FUNCTION, thread->pid, ip, &al, NULL);
+                                          MAP__FUNCTION, ip, &al, NULL);
                if (al.sym != NULL) {
                        if (sort__has_parent && !*parent &&
                            symbol__match_parent_regex(al.sym))
        return 0;
 }
 
-static int process_event_synth_stub(struct perf_event_ops *ops __used,
-                                   union perf_event *event __used,
-                                   struct perf_session *session __used)
-{
-       dump_printf(": unhandled!\n");
-       return 0;
-}
-
 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
                                                 struct perf_session *session __used)
 {
                                     union perf_event *event __used,
                                     struct perf_sample *sample __used,
                                     struct perf_evsel *evsel __used,
-                                    struct perf_session *session __used)
+                                    struct machine *machine __used)
 {
        dump_printf(": unhandled!\n");
        return 0;
 static int process_event_stub(struct perf_event_ops *ops __used,
                              union perf_event *event __used,
                              struct perf_sample *sample __used,
-                             struct perf_session *session __used)
+                             struct machine *machine __used)
 {
        dump_printf(": unhandled!\n");
        return 0;
 
 static int process_finished_round_stub(struct perf_event_ops *ops __used,
                                       union perf_event *event __used,
-                                      struct perf_session *session __used)
+                                      struct perf_session *perf_session __used)
+{
+       dump_printf(": unhandled!\n");
+       return 0;
+}
+
+static int process_event_type_stub(struct perf_event_ops *ops __used,
+                                  union perf_event *event __used)
 {
        dump_printf(": unhandled!\n");
        return 0;
        if (handler->lost == NULL)
                handler->lost = perf_event__process_lost;
        if (handler->read == NULL)
-               handler->read = process_event_stub;
+               handler->read = process_event_sample_stub;
        if (handler->throttle == NULL)
                handler->throttle = process_event_stub;
        if (handler->unthrottle == NULL)
        if (handler->attr == NULL)
                handler->attr = process_event_synth_attr_stub;
        if (handler->event_type == NULL)
-               handler->event_type = process_event_synth_stub;
+               handler->event_type = process_event_type_stub;
        if (handler->tracing_data == NULL)
                handler->tracing_data = process_event_synth_tracing_data_stub;
        if (handler->build_id == NULL)
-               handler->build_id = process_event_synth_stub;
+               handler->build_id = process_finished_round_stub;
        if (handler->finished_round == NULL) {
                if (handler->ordered_samples)
                        handler->finished_round = process_finished_round;
                callchain__printf(sample);
 }
 
+static struct machine *
+       perf_session__find_machine_for_cpumode(struct perf_session *session,
+                                              union perf_event *event)
+{
+       const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+
+       if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest)
+               return perf_session__find_machine(session, event->ip.pid);
+
+       return perf_session__find_host_machine(session);
+}
+
 static int perf_session_deliver_event(struct perf_session *session,
                                      union perf_event *event,
                                      struct perf_sample *sample,
                                      u64 file_offset)
 {
        struct perf_evsel *evsel;
+       struct machine *machine;
 
        dump_event(session, event, file_offset, sample);
 
                hists__inc_nr_events(&evsel->hists, event->header.type);
        }
 
+       machine = perf_session__find_machine_for_cpumode(session, event);
+
        switch (event->header.type) {
        case PERF_RECORD_SAMPLE:
                dump_sample(session, event, sample);
                        ++session->hists.stats.nr_unknown_id;
                        return -1;
                }
-               return ops->sample(ops, event, sample, evsel, session);
+               return ops->sample(ops, event, sample, evsel, machine);
        case PERF_RECORD_MMAP:
-               return ops->mmap(ops, event, sample, session);
+               return ops->mmap(ops, event, sample, machine);
        case PERF_RECORD_COMM:
-               return ops->comm(ops, event, sample, session);
+               return ops->comm(ops, event, sample, machine);
        case PERF_RECORD_FORK:
-               return ops->fork(ops, event, sample, session);
+               return ops->fork(ops, event, sample, machine);
        case PERF_RECORD_EXIT:
-               return ops->exit(ops, event, sample, session);
+               return ops->exit(ops, event, sample, machine);
        case PERF_RECORD_LOST:
-               return ops->lost(ops, event, sample, session);
+               if (ops->lost == perf_event__process_lost)
+                       session->hists.stats.total_lost += event->lost.lost;
+               return ops->lost(ops, event, sample, machine);
        case PERF_RECORD_READ:
-               return ops->read(ops, event, sample, session);
+               return ops->read(ops, event, sample, evsel, machine);
        case PERF_RECORD_THROTTLE:
-               return ops->throttle(ops, event, sample, session);
+               return ops->throttle(ops, event, sample, machine);
        case PERF_RECORD_UNTHROTTLE:
-               return ops->unthrottle(ops, event, sample, session);
+               return ops->unthrottle(ops, event, sample, machine);
        default:
                ++session->hists.stats.nr_unknown_events;
                return -1;
                        perf_session__update_sample_type(session);
                return err;
        case PERF_RECORD_HEADER_EVENT_TYPE:
-               return ops->event_type(ops, event, session);
+               return ops->event_type(ops, event);
        case PERF_RECORD_HEADER_TRACING_DATA:
                /* setup for reading amidst mmap */
                lseek(session->fd, file_offset, SEEK_SET);
        return true;
 }
 
-int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
-                                            const char *symbol_name,
-                                            u64 addr)
+int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
+                                    const char *symbol_name, u64 addr)
 {
        char *bracket;
        enum map_type i;
        return NULL;
 }
 
-void perf_session__print_ip(union perf_event *event, struct perf_evsel *evsel,
-                           struct perf_sample *sample,
-                           struct perf_session *session,
-                           int print_sym, int print_dso)
+void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
+                         struct machine *machine, struct perf_evsel *evsel,
+                         int print_sym, int print_dso)
 {
        struct addr_location al;
        const char *symname, *dsoname;
        struct callchain_cursor *cursor = &evsel->hists.callchain_cursor;
        struct callchain_cursor_node *node;
 
-       if (perf_event__preprocess_sample(event, session, &al, sample,
+       if (perf_event__preprocess_sample(event, machine, &al, sample,
                                          NULL) < 0) {
                error("problem processing %d event, skipping it.\n",
                        event->header.type);
 
        if (symbol_conf.use_callchain && sample->callchain) {
 
-               if (perf_session__resolve_callchain(session, evsel, al.thread,
+               if (machine__resolve_callchain(machine, evsel, al.thread,
                                                sample->callchain, NULL) != 0) {
                        if (verbose)
                                error("Failed to resolve callchain. Skipping\n");
 
 
 typedef int (*event_sample)(struct perf_event_ops *ops,
                            union perf_event *event, struct perf_sample *sample,
-                           struct perf_evsel *evsel, struct perf_session *session);
+                           struct perf_evsel *evsel, struct machine *machine);
 typedef int (*event_op)(struct perf_event_ops *ops, union perf_event *event,
                        struct perf_sample *sample,
-                       struct perf_session *session);
+                       struct machine *machine);
 typedef int (*event_synth_op)(union perf_event *self,
                              struct perf_session *session);
 typedef int (*event_attr_op)(union perf_event *event,
                             struct perf_evlist **pevlist);
+typedef int (*event_simple_op)(struct perf_event_ops *ops,
+                              union perf_event *event);
 typedef int (*event_op2)(struct perf_event_ops *ops, union perf_event *event,
                         struct perf_session *session);
 
 struct perf_event_ops {
-       event_sample    sample;
+       event_sample    sample,
+                       read;
        event_op        mmap,
                        comm,
                        fork,
                        exit,
                        lost,
-                       read,
                        throttle,
                        unthrottle;
        event_attr_op   attr;
        event_synth_op  tracing_data;
-       event_op2       event_type,
-                       build_id,
-                       finished_round;
+       event_simple_op event_type;
+       event_op2       finished_round,
+                       build_id;
        bool            ordered_samples;
        bool            ordering_requires_timestamps;
 };
 
 bool perf_session__has_traces(struct perf_session *self, const char *msg);
 
-int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
-                                            const char *symbol_name,
-                                            u64 addr);
-
 void mem_bswap_64(void *src, int byte_size);
 void perf_event__attr_swap(struct perf_event_attr *attr);
 
        return machines__process(&self->machines, process, ops);
 }
 
+struct thread *perf_session__findnew(struct perf_session *self, pid_t pid);
+size_t perf_session__fprintf(struct perf_session *self, FILE *fp);
+
 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp);
 
 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self,
 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
                                            unsigned int type);
 
-void perf_session__print_ip(union perf_event *event, struct perf_evsel *evsel,
-                                struct perf_sample *sample,
-                                struct perf_session *session,
-                                int print_sym, int print_dso);
+void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
+                         struct machine *machine, struct perf_evsel *evsel,
+                         int print_sym, int print_dso);
 
 int perf_session__cpu_bitmap(struct perf_session *session,
                             const char *cpu_list, unsigned long *cpu_bitmap);
 
        int                     comm_len;
 };
 
-struct perf_session;
+struct machine;
 
 void thread__delete(struct thread *self);
 
 int thread__set_comm(struct thread *self, const char *comm);
 int thread__comm_len(struct thread *self);
-struct thread *perf_session__findnew(struct perf_session *self, pid_t pid);
 void thread__insert_map(struct thread *self, struct map *map);
 int thread__fork(struct thread *self, struct thread *parent);
-size_t perf_session__fprintf(struct perf_session *self, FILE *fp);
 
 static inline struct map *thread__find_map(struct thread *self,
                                           enum map_type type, u64 addr)
        return self ? map_groups__find(&self->mg, type, addr) : NULL;
 }
 
-void thread__find_addr_map(struct thread *self,
-                          struct perf_session *session, u8 cpumode,
-                          enum map_type type, pid_t pid, u64 addr,
+void thread__find_addr_map(struct thread *thread, struct machine *machine,
+                          u8 cpumode, enum map_type type, u64 addr,
                           struct addr_location *al);
 
-void thread__find_addr_location(struct thread *self,
-                               struct perf_session *session, u8 cpumode,
-                               enum map_type type, pid_t pid, u64 addr,
+void thread__find_addr_location(struct thread *thread, struct machine *machine,
+                               u8 cpumode, enum map_type type, u64 addr,
                                struct addr_location *al,
                                symbol_filter_t filter);
 #endif /* __PERF_THREAD_H */
 
 static void process_event_unsupported(union perf_event *event __unused,
                                      struct perf_sample *sample __unused,
                                      struct perf_evsel *evsel __unused,
-                                     struct perf_session *session __unused,
+                                     struct machine *machine __unused,
                                      struct thread *thread __unused)
 {
 }
 
 
 #include <stdbool.h>
 #include "parse-events.h"
-#include "session.h"
+
+struct machine;
+struct perf_sample;
+union perf_event;
+struct thread;
 
 #define __unused __attribute__((unused))
 
        void (*process_event) (union perf_event *event,
                               struct perf_sample *sample,
                               struct perf_evsel *evsel,
-                              struct perf_session *session,
+                              struct machine *machine,
                               struct thread *thread);
        int (*generate_script) (const char *outfile);
 };