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perf: Introduce a new "round of buffers read" pseudo event 

In order to provide a more rubust and deterministic reordering
algorithm, we need to know when we reach a point where we just
did a pass through over every counter buffers to read every thing
they had.

This patch introduces a new PERF_RECORD_FINISHED_ROUND pseudo event
that only consist in an event header and doesn't need to contain
anything.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
This commit is contained in:
Frederic Weisbecker 2010-05-02 22:05:29 +02:00
parent e157eb8341
commit 9840280757
2 changed files with 26 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
tools/perf/builtin-record.c
View File

@ -494,6 +494,29 @@ static void event__synthesize_guest_os(struct machine *machine, void *data)
" relocation symbol.\n", machine->pid);
}
static struct perf_event_header finished_round_event = {
.size = sizeof(struct perf_event_header),
.type = PERF_RECORD_FINISHED_ROUND,
};
static void mmap_read_all(void)
{
int i, counter, thread;
for (i = 0; i < nr_cpu; i++) {
for (counter = 0; counter < nr_counters; counter++) {
for (thread = 0; thread < thread_num; thread++) {
if (mmap_array[i][counter][thread].base)
mmap_read(&mmap_array[i][counter][thread]);
}
}
}
if (perf_header__has_feat(&session->header, HEADER_TRACE_INFO))
write_output(&finished_round_event, sizeof(finished_round_event));
}
static int __cmd_record(int argc, const char **argv)
{
int i, counter;
@ -726,16 +749,7 @@ static int __cmd_record(int argc, const char **argv)
int hits = samples;
int thread;
for (i = 0; i < nr_cpu; i++) {
for (counter = 0; counter < nr_counters; counter++) {
for (thread = 0;
thread < thread_num; thread++) {
if (mmap_array[i][counter][thread].base)
mmap_read(&mmap_array[i][counter][thread]);
}
}
}
mmap_read_all();
if (hits == samples) {
if (done)

3
tools/perf/util/event.h
View File

@ -84,11 +84,12 @@ struct build_id_event {
char filename[];
};
enum perf_header_event_type { /* above any possible kernel type */
enum perf_user_event_type { /* above any possible kernel type */
PERF_RECORD_HEADER_ATTR = 64,
PERF_RECORD_HEADER_EVENT_TYPE = 65,
PERF_RECORD_HEADER_TRACING_DATA = 66,
PERF_RECORD_HEADER_BUILD_ID = 67,
PERF_RECORD_FINISHED_ROUND = 68,
PERF_RECORD_HEADER_MAX
};