Commit 74eec26f authored by Andrew Vagin's avatar Andrew Vagin Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add ability to synthesize event according to a sample 



It's the counterpart of perf_session__parse_sample.

v2: fixed mistakes found by David Ahern.
v3: s/data/sample/
    s/perf_event__change_sample/perf_event__synthesize_sample

Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: devel@openvz.org
Link: http://lkml.kernel.org/r/1323266161-394927-3-git-send-email-avagin@openvz.org


Signed-off-by: default avatarAndrew Vagin <avagin@openvz.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 317df650

tools/perf/util/event.h

+3 −0
Original line number Diff line number Diff line
@@ -199,6 +199,9 @@ const char *perf_event__name(unsigned int id); 
int perf_event__parse_sample(const union perf_event *event, u64 type,

			     int sample_size, bool sample_id_all,

			     struct perf_sample *sample, bool swapped);

int perf_event__synthesize_sample(union perf_event *event, u64 type,

				  const struct perf_sample *sample,

				  bool swapped);



size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp);

size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp);

tools/perf/util/evsel.c

+79 −0
Original line number Diff line number Diff line
@@ -574,3 +574,82 @@ int perf_event__parse_sample(const union perf_event *event, u64 type, 


	return 0;

}



int perf_event__synthesize_sample(union perf_event *event, u64 type,

				  const struct perf_sample *sample,

				  bool swapped)

{

	u64 *array;



	/*

	 * used for cross-endian analysis. See git commit 65014ab3

	 * for why this goofiness is needed.

	 */

	union {

		u64 val64;

		u32 val32[2];

	} u;



	array = event->sample.array;



	if (type & PERF_SAMPLE_IP) {

		event->ip.ip = sample->ip;

		array++;

	}



	if (type & PERF_SAMPLE_TID) {

		u.val32[0] = sample->pid;

		u.val32[1] = sample->tid;

		if (swapped) {

			/*

			 * Inverse of what is done in perf_event__parse_sample

			 */

			u.val32[0] = bswap_32(u.val32[0]);

			u.val32[1] = bswap_32(u.val32[1]);

			u.val64 = bswap_64(u.val64);

		}



		*array = u.val64;

		array++;

	}



	if (type & PERF_SAMPLE_TIME) {

		*array = sample->time;

		array++;

	}



	if (type & PERF_SAMPLE_ADDR) {

		*array = sample->addr;

		array++;

	}



	if (type & PERF_SAMPLE_ID) {

		*array = sample->id;

		array++;

	}



	if (type & PERF_SAMPLE_STREAM_ID) {

		*array = sample->stream_id;

		array++;

	}



	if (type & PERF_SAMPLE_CPU) {

		u.val32[0] = sample->cpu;

		if (swapped) {

			/*

			 * Inverse of what is done in perf_event__parse_sample

			 */

			u.val32[0] = bswap_32(u.val32[0]);

			u.val64 = bswap_64(u.val64);

		}

		*array = u.val64;

		array++;

	}



	if (type & PERF_SAMPLE_PERIOD) {

		*array = sample->period;

		array++;

	}



	return 0;

}

tools/perf/util/session.h

+8 −0
Original line number Diff line number Diff line
@@ -134,6 +134,14 @@ static inline int perf_session__parse_sample(struct perf_session *session, 
					session->header.needs_swap);

}



static inline int perf_session__synthesize_sample(struct perf_session *session,

						  union perf_event *event,

						  const struct perf_sample *sample)

{

	return perf_event__synthesize_sample(event, session->sample_type,

					     sample, session->header.needs_swap);

}



struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,

					    unsigned int type);

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