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perf evsel: Introduce method to request IDs be used

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When mmaping multiple events we need to find the right evsel that
matches an event in the ring buffer.

For that we need to set the PERF_FORMAT_ID bit in
perf_event_attr.read_format so that when we read the event fds we get
that id to then hash it and be able later to use perf_evlist__id2evsel
to find the right evsel.

We also need to set the PERF_SAMPLE_ID bit in
perf_event_attr.sample_type to ask for that id to be stashed in each
sample, so that we can demux it.

So add a perf_evsel__set_sample_id() method to do those two things in
one operation.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
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/n/tip-1z4xcmbud30lamklfe80oopu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2012-12-10 15:21:30 -03:00
parent a60d79535c
commit 7a5a5ca5fe
4 changed files with 11 additions and 6 deletions
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6
tools/perf/builtin-top.c
View file

@ -910,10 +910,8 @@ static void perf_top__start_counters(struct perf_top *top)
attr->sample_freq = top->freq;
}
if (evlist->nr_entries > 1) {
perf_evsel__set_sample_bit(counter, ID);
attr->read_format |= PERF_FORMAT_ID;
}
if (evlist->nr_entries > 1)
perf_evsel__set_sample_id(counter);
if (perf_target__has_cpu(&top->target))
perf_evsel__set_sample_bit(counter, CPU);

3
tools/perf/tests/mmap-basic.c
View file

@ -70,8 +70,7 @@ int test__basic_mmap(void)
}
evsels[i]->attr.wakeup_events = 1;
evsels[i]->attr.read_format |= PERF_FORMAT_ID;
perf_evsel__set_sample_bit(evsels[i], ID);
perf_evsel__set_sample_id(evsels[i]);
perf_evlist__add(evlist, evsels[i]);

6
tools/perf/util/evsel.c
View file

@ -68,6 +68,12 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
}
}
void perf_evsel__set_sample_id(struct perf_evsel *evsel)
{
perf_evsel__set_sample_bit(evsel, ID);
evsel->attr.read_format |= PERF_FORMAT_ID;
}
void perf_evsel__init(struct perf_evsel *evsel,
struct perf_event_attr *attr, int idx)
{

2
tools/perf/util/evsel.h
View file

@ -129,6 +129,8 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
#define perf_evsel__reset_sample_bit(evsel, bit) \
__perf_evsel__reset_sample_bit(evsel, PERF_SAMPLE_##bit)
void perf_evsel__set_sample_id(struct perf_evsel *evsel);
int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
const char *filter);