perf trace: Collect sys_nanosleep first argument

That is a 'struct timespec' passed from userspace to the kernel as we
can see with a system wide syscall tracing:

  root@number:~# perf trace -e nanosleep
       0.000 (10.102 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
      38.924 (10.077 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     100.177 (10.107 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     139.171 (10.063 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     200.603 (10.105 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     239.399 (10.064 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     300.994 (10.096 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     339.584 (10.067 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     401.335 (10.057 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     439.758 (10.166 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     501.814 (10.110 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     539.983 (10.227 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     602.284 (10.199 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     640.208 (10.105 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     702.662 (10.163 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     740.440 (10.107 ms): podman/2195174 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
     802.993 (10.159 ms): podman/9150 nanosleep(rqtp: { .tv_sec: 0, .tv_nsec: 10000000 })                   = 0
  ^Croot@number:~# strace -p 9150 -e nanosleep

If we then use the ptrace method to look at that podman process:

  root@number:~# strace -p 9150 -e nanosleep
  strace: Process 9150 attached
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  nanosleep({tv_sec=0, tv_nsec=10000000}, NULL) = 0
  ^Cstrace: Process 9150 detached
  root@number:~#

With some changes we can get something closer to the strace output,
still in system wide mode:

  root@number:~# perf config trace.show_arg_names=false
  root@number:~# perf config trace.show_duration=false
  root@number:~# perf config trace.show_timestamp=false
  root@number:~# perf config trace.show_zeros=true
  root@number:~# perf config trace.args_alignment=0
  root@number:~# perf trace -e nanosleep --max-events=10
  podman/2195174 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/9150 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/2195174 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/9150 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/2195174 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/9150 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/2195174 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/9150 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/2195174 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  podman/9150 nanosleep({ .tv_sec: 0, .tv_nsec: 10000000 }, NULL) = 0
  root@number:~#
  root@number:~# perf config
  trace.show_arg_names=false
  trace.show_duration=false
  trace.show_timestamp=false
  trace.show_zeros=true
  trace.args_alignment=0
  root@number:~# cat ~/.perfconfig
  # this file is auto-generated.
  [trace]
  	show_arg_names = false
  	show_duration = false
  	show_timestamp = false
  	show_zeros = true
  	args_alignment = 0
  root@number:~#

This will not get reused by any other syscall as nanosleep is the only
one to have as its first argument a 'struct timespec" pointer argument
passed from userspace to the kernel:

  root@number:~# grep timespec /sys/kernel/tracing/events/syscalls/sys_enter_*/format | grep offset:16
  /sys/kernel/tracing/events/syscalls/sys_enter_nanosleep/format:	field:struct __kernel_timespec * rqtp;	offset:16;	size:8;	signed:0;
  root@number:~#

BTF based pretty printing will simplify all this, but then lets just get
the low hanging fruits first.

Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/Zbq72dJRpOlfRWnf@kernel.org/
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 90eaff8c0f6e3aacef735a1aa0ad0107504fb89e..8fb032caeaf532885808c56aefe9a707e6b07f3b 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1049,6 +1049,8 @@ static const struct syscall_fmt syscall_fmts[] = {
          .arg = { [3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ }, }, },
        { .name     = "name_to_handle_at",
          .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
+       { .name     = "nanosleep",
+         .arg = { [0] = { .scnprintf = SCA_TIMESPEC,  /* req */ }, }, },
        { .name     = "newfstatat",
          .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
        { .name     = "open",

diff --git a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
index 2872f9bc07850bd7ed34336d61c38fa7c485e84b..0acbd74e8c7609563dcbb0361f3cf153ef0ad466 100644 (file)
--- a/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
+++ b/tools/perf/util/bpf_skel/augmented_raw_syscalls.bpf.c
@@ -341,6 +341,27 @@ failure:
        return 1; /* Failure: don't filter */
 }
 
+SEC("tp/syscalls/sys_enter_nanosleep")
+int sys_enter_nanosleep(struct syscall_enter_args *args)
+{
+       struct augmented_args_payload *augmented_args = augmented_args_payload();
+       const void *req_arg = (const void *)args->args[0];
+       unsigned int len = sizeof(augmented_args->args);
+       __u32 size = sizeof(struct timespec64);
+
+        if (augmented_args == NULL)
+               goto failure;
+
+       if (size > sizeof(augmented_args->__data))
+                goto failure;
+
+       bpf_probe_read_user(&augmented_args->__data, size, req_arg);
+
+       return augmented__output(args, augmented_args, len + size);
+failure:
+       return 1; /* Failure: don't filter */
+}
+
 static pid_t getpid(void)
 {
        return bpf_get_current_pid_tgid();