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| author | Namhyung Kim <namhyung@kernel.org> | 2022-06-16 11:06:23 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-12-13 17:42:19 +0100 |
| commit | ece0857258cbaf20b9828157035999f46ca060c8 (patch) | |
| tree | 87ab13dbf29e956a488c8ba850d6de4bbd9a8abf /include/linux | |
| parent | f718e2cb3915a5ec68d6cee020c2650c7b6fad5e (diff) | |
| download | linux-stable-ece0857258cbaf20b9828157035999f46ca060c8.tar.gz linux-stable-ece0857258cbaf20b9828157035999f46ca060c8.tar.bz2 linux-stable-ece0857258cbaf20b9828157035999f46ca060c8.zip | |
perf/core: Add a new read format to get a number of lost samples
[ Upstream commit 119a784c81270eb88e573174ed2209225d646656 ]
Sometimes we want to know an accurate number of samples even if it's
lost. Currenlty PERF_RECORD_LOST is generated for a ring-buffer which
might be shared with other events. So it's hard to know per-event
lost count.
Add event->lost_samples field and PERF_FORMAT_LOST to retrieve it from
userspace.
Original-patch-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220616180623.1358843-1-namhyung@kernel.org
Stable-dep-of: 382c27f4ed28 ("perf: Fix perf_event_validate_size()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/perf_event.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index d46eeddeb859..123e4d715c98 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -685,6 +685,8 @@ struct perf_event { struct pid_namespace *ns; u64 id; + atomic64_t lost_samples; + u64 (*clock)(void); perf_overflow_handler_t overflow_handler; void *overflow_handler_context; |