perf kvm: Introduce histograms data structures

This is a preparation to support histograms in perf kvm tool.  As first
step, this patch defines histograms data structures and initialize them.

Committer notes:

Those are only used by functions enclosed in:

  #if efined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)

So do this for these new functions and struct as well.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230315145112.186603-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 286faf6774ff875d59768d2fb3e690507108fc63..b06c11d306a11cab162296388ed6cbe6aa605833 100644 (file)
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -85,6 +85,20 @@ static struct kvm_event_key keys[] = {
        DEF_SORT_NAME_KEY(time, mean),
        { NULL, NULL }
 };
+
+struct kvm_hists {
+       struct hists            hists;
+       struct perf_hpp_list    list;
+};
+
+static struct kvm_hists kvm_hists;
+
+static int kvm_hists__init(void)
+{
+       __hists__init(&kvm_hists.hists, &kvm_hists.list);
+       perf_hpp_list__init(&kvm_hists.list);
+       return 0;
+}
 #endif // defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
 
 static const char *get_filename_for_perf_kvm(void)
@@ -959,6 +973,8 @@ static int kvm_events_live_report(struct perf_kvm_stat *kvm)
        set_term_quiet_input(&save);
        init_kvm_event_record(kvm);
 
+       kvm_hists__init();
+
        signal(SIGINT, sig_handler);
        signal(SIGTERM, sig_handler);
 
@@ -1154,6 +1170,8 @@ static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
        init_kvm_event_record(kvm);
        setup_pager();
 
+       kvm_hists__init();
+
        ret = read_events(kvm);
        if (ret)
                goto exit;

diff --git a/tools/perf/util/kvm-stat.h b/tools/perf/util/kvm-stat.h
index 841b3174c211760dc436d27105d02eb1213aa432..e2c17662bac75326f2e65eb9e4cbacc457d5cfb5 100644 (file)
--- a/tools/perf/util/kvm-stat.h
+++ b/tools/perf/util/kvm-stat.h
@@ -5,6 +5,7 @@
 #ifdef HAVE_KVM_STAT_SUPPORT
 
 #include "tool.h"
+#include "sort.h"
 #include "stat.h"
 #include "record.h"