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authorKan Liang <kan.liang@intel.com>2015-05-10 15:13:14 -0400
committerIngo Molnar <mingo@kernel.org>2015-06-07 16:09:02 +0200
commitf38b0dbb491a6987e198aa6b428db8692a6480f8 (patch)
treea3ba22b7226e96b085d3e08174d73a3883cfe44a /include/linux/perf_event.h
parent156174999dd1d0fe8732f5a05f4e9cef921ad487 (diff)
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 'include/linux/perf_event.h')
-rw-r--r--include/linux/perf_event.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 5f192e1bc98e..a204d5266f5f 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -743,6 +743,9 @@ perf_event__output_id_sample(struct perf_event *event,
struct perf_output_handle *handle,
struct perf_sample_data *sample);
+extern void
+perf_log_lost_samples(struct perf_event *event, u64 lost);
+
static inline bool is_sampling_event(struct perf_event *event)
{
return event->attr.sample_period != 0;