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perf session: Add facility to peek at all events

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AUX area samples are not limited in how far back in time the sample
could start. Consequently samples must be queued in advance to allow for
time-ordered processing. To achieve that, add
perf_session__peek_events() that walks and peeks at all the events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20191115124225.5247-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-11-15 14:42:20 +02:00 committed by Arnaldo Carvalho de Melo
parent b04b8dd1e4
commit 103ed40e4b
2 changed files with 33 additions and 0 deletions
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28
tools/perf/util/session.c
View File

@ -1659,6 +1659,34 @@ out_parse_sample:
return 0;
}
int perf_session__peek_events(struct perf_session *session, u64 offset,
u64 size, peek_events_cb_t cb, void *data)
{
u64 max_offset = offset + size;
char buf[PERF_SAMPLE_MAX_SIZE];
union perf_event *event;
int err;
do {
err = perf_session__peek_event(session, offset, buf,
PERF_SAMPLE_MAX_SIZE, &event,
NULL);
if (err)
return err;
err = cb(session, event, offset, data);
if (err)
return err;
offset += event->header.size;
if (event->header.type == PERF_RECORD_AUXTRACE)
offset += event->auxtrace.size;
} while (offset < max_offset);
return err;
}
static s64 perf_session__process_event(struct perf_session *session,
union perf_event *event, u64 file_offset)
{

5
tools/perf/util/session.h
View File

@ -64,6 +64,11 @@ int perf_session__peek_event(struct perf_session *session, off_t file_offset,
void *buf, size_t buf_sz,
union perf_event **event_ptr,
struct perf_sample *sample);
typedef int (*peek_events_cb_t)(struct perf_session *session,
union perf_event *event, u64 offset,
void *data);
int perf_session__peek_events(struct perf_session *session, u64 offset,
u64 size, peek_events_cb_t cb, void *data);
int perf_session__process_events(struct perf_session *session);