diff options
| author |   Namhyung Kim <namhyung@kernel.org> | 2022-06-16 11:06:23 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-06-28 09:08:31 +0200 |
| commit | 119a784c81270eb88e573174ed2209225d646656 (patch) | |
| tree | 6fa3da6264de67a39be33724c2785c045d6d0bfb /include/linux/perf_event.h | |
| parent | perf/x86/amd/uncore: Add PerfMonV2 RDPMC assignments (diff) | |
| download | linux-dev-119a784c81270eb88e573174ed2209225d646656.tar.xz linux-dev-119a784c81270eb88e573174ed2209225d646656.zip | |
perf/core: Add a new read format to get a number of lost samples
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
Diffstat (limited to 'include/linux/perf_event.h')
| -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 da759560eec5..ee8b9ecdc03b 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -759,6 +759,8 @@ 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; |