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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2015-01-14 14:18:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-02 17:14:12 +0200 |
| commit | 68db7e98c3a6ebe7284b6cf14906ed7c55f3f7f0 (patch) | |
| tree | aff39ee8c8f8703e262768397610c5949fd93f48 /kernel | |
| parent | bed5b25ad9c8a2f5d735ef0bc746ec870c01c1b0 (diff) | |
| download | lwn-68db7e98c3a6ebe7284b6cf14906ed7c55f3f7f0.tar.gz lwn-68db7e98c3a6ebe7284b6cf14906ed7c55f3f7f0.zip | |
perf: Add AUX record
When there's new data in the AUX space, output a record indicating its
offset and size and a set of flags, such as PERF_AUX_FLAG_TRUNCATED, to
mean the described data was truncated to fit in the ring buffer.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kaixu Xia <kaixu.xia@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: adrian.hunter@intel.com
Cc: kan.liang@intel.com
Cc: markus.t.metzger@intel.com
Cc: mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1421237903-181015-7-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 34 | ||||
| -rw-r--r-- | kernel/events/internal.h | 3 |
2 files changed, 37 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 6d9fdaef7b57..dbc2eff32230 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5916,6 +5916,40 @@ void perf_event_mmap(struct vm_area_struct *vma) perf_event_mmap_event(&mmap_event); } +void perf_event_aux_event(struct perf_event *event, unsigned long head, + unsigned long size, u64 flags) +{ + struct perf_output_handle handle; + struct perf_sample_data sample; + struct perf_aux_event { + struct perf_event_header header; + u64 offset; + u64 size; + u64 flags; + } rec = { + .header = { + .type = PERF_RECORD_AUX, + .misc = 0, + .size = sizeof(rec), + }, + .offset = head, + .size = size, + .flags = flags, + }; + int ret; + + perf_event_header__init_id(&rec.header, &sample, event); + ret = perf_output_begin(&handle, event, rec.header.size); + + if (ret) + return; + + perf_output_put(&handle, rec); + perf_event__output_id_sample(event, &handle, &sample); + + perf_output_end(&handle); +} + /* * IRQ throttle logging */ diff --git a/kernel/events/internal.h b/kernel/events/internal.h index 0f6d08015927..4d117a981431 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -62,6 +62,9 @@ static inline bool rb_has_aux(struct ring_buffer *rb) return !!rb->aux_nr_pages; } +void perf_event_aux_event(struct perf_event *event, unsigned long head, + unsigned long size, u64 flags); + extern void perf_event_header__init_id(struct perf_event_header *header, struct perf_sample_data *data, |