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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: Adrian 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: Arnaldo Carvalho de Melo <acme@redhat.com>
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2 changed files with 94 additions and 0 deletions
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@ -229,6 +229,8 @@ int perf_event__preprocess_sample(const union perf_event *self,
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const char *perf_event__name(unsigned int id);
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size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
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u64 sample_regs_user, u64 read_format);
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int perf_event__synthesize_sample(union perf_event *event, u64 type,
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u64 sample_regs_user, u64 read_format,
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const struct perf_sample *sample,
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@ -1465,6 +1465,98 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
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return 0;
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}
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size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
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u64 sample_regs_user, u64 read_format)
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{
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size_t sz, result = sizeof(struct sample_event);
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if (type & PERF_SAMPLE_IDENTIFIER)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_IP)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_TID)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_TIME)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_ADDR)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_ID)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_STREAM_ID)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_CPU)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_PERIOD)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_READ) {
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result += sizeof(u64);
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if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
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result += sizeof(u64);
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if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
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result += sizeof(u64);
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/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
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if (read_format & PERF_FORMAT_GROUP) {
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sz = sample->read.group.nr *
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sizeof(struct sample_read_value);
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result += sz;
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} else {
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result += sizeof(u64);
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}
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}
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if (type & PERF_SAMPLE_CALLCHAIN) {
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sz = (sample->callchain->nr + 1) * sizeof(u64);
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result += sz;
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}
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if (type & PERF_SAMPLE_RAW) {
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result += sizeof(u32);
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result += sample->raw_size;
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}
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if (type & PERF_SAMPLE_BRANCH_STACK) {
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sz = sample->branch_stack->nr * sizeof(struct branch_entry);
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sz += sizeof(u64);
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result += sz;
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}
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if (type & PERF_SAMPLE_REGS_USER) {
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if (sample->user_regs.abi) {
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result += sizeof(u64);
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sz = hweight_long(sample_regs_user) * sizeof(u64);
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result += sz;
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} else {
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result += sizeof(u64);
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}
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}
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if (type & PERF_SAMPLE_STACK_USER) {
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sz = sample->user_stack.size;
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result += sizeof(u64);
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if (sz) {
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result += sz;
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result += sizeof(u64);
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}
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}
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if (type & PERF_SAMPLE_WEIGHT)
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result += sizeof(u64);
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if (type & PERF_SAMPLE_DATA_SRC)
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result += sizeof(u64);
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return result;
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}
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int perf_event__synthesize_sample(union perf_event *event, u64 type,
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u64 sample_regs_user, u64 read_format,
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const struct perf_sample *sample,
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