diff options
| author | Kan Liang <kan.liang@intel.com> | 2015-05-10 19:13:14 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-06-07 14:09:02 (GMT) |
| commit | f38b0dbb491a6987e198aa6b428db8692a6480f8 (patch) | |
| tree | a3ba22b7226e96b085d3e08174d73a3883cfe44a /kernel/events | |
| parent | 156174999dd1d0fe8732f5a05f4e9cef921ad487 (diff) | |
| download | linux-f38b0dbb491a6987e198aa6b428db8692a6480f8.tar.xz | |
perf/x86/intel: Introduce PERF_RECORD_LOST_SAMPLES
After enlarging the PEBS interrupt threshold, there may be some mixed up
PEBS samples which are discarded by the kernel.
This patch makes the kernel emit a PERF_RECORD_LOST_SAMPLES record with
the number of possible discarded records when it is impossible to demux
the samples.
It makes sure the user is not left in the dark about such discards.
Signed-off-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@infradead.org
Cc: eranian@google.com
Link: http://lkml.kernel.org/r/1431285195-14269-8-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index e499b4e..9e0773d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5975,6 +5975,39 @@ void perf_event_aux_event(struct perf_event *event, unsigned long head, } /* + * Lost/dropped samples logging + */ +void perf_log_lost_samples(struct perf_event *event, u64 lost) +{ + struct perf_output_handle handle; + struct perf_sample_data sample; + int ret; + + struct { + struct perf_event_header header; + u64 lost; + } lost_samples_event = { + .header = { + .type = PERF_RECORD_LOST_SAMPLES, + .misc = 0, + .size = sizeof(lost_samples_event), + }, + .lost = lost, + }; + + perf_event_header__init_id(&lost_samples_event.header, &sample, event); + + ret = perf_output_begin(&handle, event, + lost_samples_event.header.size); + if (ret) + return; + + perf_output_put(&handle, lost_samples_event); + perf_event__output_id_sample(event, &handle, &sample); + perf_output_end(&handle); +} + +/* * IRQ throttle logging */ |