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| author | Jiri Olsa <jolsa@kernel.org> | 2016-11-21 22:33:26 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-11-23 14:44:03 +0100 |
| commit | 7b4b82bced0755aecc026d8c14c2608aa0f9e89b (patch) | |
| tree | 590dee9afe0adc89735e6da4b43521a392f82452 /tools/perf/util/evsel.c | |
| parent | tools lib traceevent: Add retrieval of preempt count and latency flags (diff) | |
| download | linux-7b4b82bced0755aecc026d8c14c2608aa0f9e89b.tar.xz linux-7b4b82bced0755aecc026d8c14c2608aa0f9e89b.zip | |
perf tools: Show event fd in debug output
It is useful for debug to see file descriptors for each event.
Before:
$ perf stat -vvv -e cycles,cache-misses ls
...
sys_perf_event_open: pid 12146 cpu -1 group_fd -1 flags 0x8
...
sys_perf_event_open: pid 12146 cpu -1 group_fd 3 flags 0x8
sys_perf_event_open failed, error -13
Now:
$ perf stat -vvv -e cycles,cache-misses ls
...
sys_perf_event_open: pid 12858 cpu -1 group_fd -1 flags 0x8 = 3
...
sys_perf_event_open: pid 12858 cpu -1 group_fd 3 flags 0x8
sys_perf_event_open failed, error -13
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1479764011-10732-2-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index e58a2fbf3b16..b2365a63db45 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1481,7 +1481,7 @@ retry_sample_id: group_fd = get_group_fd(evsel, cpu, thread); retry_open: - pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n", + pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx", pid, cpus->map[cpu], group_fd, flags); FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr, @@ -1490,11 +1490,13 @@ retry_open: group_fd, flags); if (FD(evsel, cpu, thread) < 0) { err = -errno; - pr_debug2("sys_perf_event_open failed, error %d\n", + pr_debug2("\nsys_perf_event_open failed, error %d\n", err); goto try_fallback; } + pr_debug2(" = %d\n", FD(evsel, cpu, thread)); + if (evsel->bpf_fd >= 0) { int evt_fd = FD(evsel, cpu, thread); int bpf_fd = evsel->bpf_fd; |