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perf: Add AUX record

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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>
This commit is contained in:
Alexander Shishkin 2015-01-14 14:18:15 +02:00 committed by Ingo Molnar
parent bed5b25ad9
commit 68db7e98c3
3 changed files with 56 additions and 0 deletions
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19
include/uapi/linux/perf_event.h
View File

@ -768,6 +768,20 @@ enum perf_event_type {
*/
PERF_RECORD_MMAP2 = 10,
/*
* Records that new data landed in the AUX buffer part.
*
* struct {
* struct perf_event_header header;
*
* u64 aux_offset;
* u64 aux_size;
* u64 flags;
* struct sample_id sample_id;
* };
*/
PERF_RECORD_AUX = 11,
PERF_RECORD_MAX, /* non-ABI */
};
@ -785,6 +799,11 @@ enum perf_callchain_context {
PERF_CONTEXT_MAX = (__u64)-4095,
};
/**
* PERF_RECORD_AUX::flags bits
*/
#define PERF_AUX_FLAG_TRUNCATED 0x01 /* record was truncated to fit */
#define PERF_FLAG_FD_NO_GROUP (1UL << 0)
#define PERF_FLAG_FD_OUTPUT (1UL << 1)
#define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */

34
kernel/events/core.c
View File

@ -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
*/

3
kernel/events/internal.h
View File

@ -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,