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Commit 5a52f33a authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf session: Add perf_session__peek_event() 



Add a function to peek at other events in the event stream.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406786474-9306-15-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 60b0896c

tools/perf/util/session.c

+55 −0
Original line number Diff line number Diff line
@@ -897,6 +897,61 @@ static void event_swap(union perf_event *event, bool sample_id_all) 
		swap(event, sample_id_all);

}



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)

{

	union perf_event *event;

	size_t hdr_sz, rest;

	int fd;



	if (session->one_mmap && !session->header.needs_swap) {

		event = file_offset - session->one_mmap_offset +

			session->one_mmap_addr;

		goto out_parse_sample;

	}



	if (perf_data_file__is_pipe(session->file))

		return -1;



	fd = perf_data_file__fd(session->file);

	hdr_sz = sizeof(struct perf_event_header);



	if (buf_sz < hdr_sz)

		return -1;



	if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||

	    readn(fd, &buf, hdr_sz) != (ssize_t)hdr_sz)

		return -1;



	event = (union perf_event *)buf;



	if (session->header.needs_swap)

		perf_event_header__bswap(&event->header);



	if (event->header.size < hdr_sz)

		return -1;



	rest = event->header.size - hdr_sz;



	if (readn(fd, &buf, rest) != (ssize_t)rest)

		return -1;



	if (session->header.needs_swap)

		event_swap(event, perf_evlist__sample_id_all(session->evlist));



out_parse_sample:



	if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&

	    perf_evlist__parse_sample(session->evlist, event, sample))

		return -1;



	*event_ptr = event;



	return 0;

}



static s64 perf_session__process_event(struct perf_session *session,

				       union perf_event *event,

				       struct perf_tool *tool,

tools/perf/util/session.h

+5 −0
Original line number Diff line number Diff line
@@ -45,6 +45,11 @@ void perf_session__delete(struct perf_session *session); 


void perf_event_header__bswap(struct perf_event_header *hdr);



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);



int __perf_session__process_events(struct perf_session *session,

				   u64 data_offset, u64 data_size, u64 size,

				   struct perf_tool *tool);