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Commit b1cf6f65 authored by Adrian Hunter's avatar Adrian Hunter Committed by Arnaldo Carvalho de Melo
Browse files

perf tools: Add a function to calculate sample event size 



Add perf_event__sample_event_size() which can be used when synthesizing
sample events to determine how big the resulting event will be, and
therefore how much memory to allocate.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
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/1377591794-30553-11-git-send-email-adrian.hunter@intel.com


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent d03f2170

tools/perf/util/event.h

+2 −0
Original line number Diff line number Diff line
@@ -229,6 +229,8 @@ int perf_event__preprocess_sample(const union perf_event *self, 


const char *perf_event__name(unsigned int id);



size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,

				     u64 sample_regs_user, u64 read_format);

int perf_event__synthesize_sample(union perf_event *event, u64 type,

				  u64 sample_regs_user, u64 read_format,

				  const struct perf_sample *sample,

tools/perf/util/evsel.c

+92 −0
Original line number Diff line number Diff line
@@ -1465,6 +1465,98 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event, 
	return 0;

}



size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,

				     u64 sample_regs_user, u64 read_format)

{

	size_t sz, result = sizeof(struct sample_event);



	if (type & PERF_SAMPLE_IDENTIFIER)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_IP)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_TID)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_TIME)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_ADDR)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_ID)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_STREAM_ID)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_CPU)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_PERIOD)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_READ) {

		result += sizeof(u64);

		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)

			result += sizeof(u64);

		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)

			result += sizeof(u64);

		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */

		if (read_format & PERF_FORMAT_GROUP) {

			sz = sample->read.group.nr *

			     sizeof(struct sample_read_value);

			result += sz;

		} else {

			result += sizeof(u64);

		}

	}



	if (type & PERF_SAMPLE_CALLCHAIN) {

		sz = (sample->callchain->nr + 1) * sizeof(u64);

		result += sz;

	}



	if (type & PERF_SAMPLE_RAW) {

		result += sizeof(u32);

		result += sample->raw_size;

	}



	if (type & PERF_SAMPLE_BRANCH_STACK) {

		sz = sample->branch_stack->nr * sizeof(struct branch_entry);

		sz += sizeof(u64);

		result += sz;

	}



	if (type & PERF_SAMPLE_REGS_USER) {

		if (sample->user_regs.abi) {

			result += sizeof(u64);

			sz = hweight_long(sample_regs_user) * sizeof(u64);

			result += sz;

		} else {

			result += sizeof(u64);

		}

	}



	if (type & PERF_SAMPLE_STACK_USER) {

		sz = sample->user_stack.size;

		result += sizeof(u64);

		if (sz) {

			result += sz;

			result += sizeof(u64);

		}

	}



	if (type & PERF_SAMPLE_WEIGHT)

		result += sizeof(u64);



	if (type & PERF_SAMPLE_DATA_SRC)

		result += sizeof(u64);



	return result;

}



int perf_event__synthesize_sample(union perf_event *event, u64 type,

				  u64 sample_regs_user, u64 read_format,

				  const struct perf_sample *sample,