Commit 1ee94463 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add perf_event__synthesize_id_sample() 



Add perf_event__synthesize_id_sample() to enable the synthesis of
ID samples.

This is needed by perf inject. When injecting events from a guest perf.data
file, there is a possibility that the sample ID numbers conflict. In that
case, perf_event__synthesize_id_sample() can be used to re-write the ID
sample.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-7-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 0a64de04

tools/perf/util/synthetic-events.c

+47 −0
Original line number Diff line number Diff line
@@ -1712,6 +1712,53 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_fo 
	return 0;

}



int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)

{

	__u64 *start = array;



	/*

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

	 * for why this goofiness is needed.

	 */

	union u64_swap u;



	if (type & PERF_SAMPLE_TID) {

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

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

		*array = u.val64;

		array++;

	}



	if (type & PERF_SAMPLE_TIME) {

		*array = sample->time;

		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;

		u.val32[1] = 0;

		*array = u.val64;

		array++;

	}



	if (type & PERF_SAMPLE_IDENTIFIER) {

		*array = sample->id;

		array++;

	}



	return (void *)array - (void *)start;

}



int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,

				    struct evlist *evlist, struct machine *machine)

{

tools/perf/util/synthetic-events.h

+1 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evs 
int perf_event__synthesize_extra_kmaps(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);

int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, struct evlist *evlist, perf_event__handler_t process);

int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, struct evlist *evlist, struct machine *machine);

int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample);

int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);

int perf_event__synthesize_mmap_events(struct perf_tool *tool, union perf_event *event, pid_t pid, pid_t tgid, perf_event__handler_t process, struct machine *machine, bool mmap_data);

int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, struct machine *machine);