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| author |   Frederic Weisbecker <fweisbec@gmail.com> | 2010-05-02 22:05:29 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-05-09 13:43:42 +0200 |
| commit | 984028075794c00cbf4fb1e94bb6233e8be08875 (patch) | |
| tree | 80c925f948cce8132dde8ec9307854365d363aff /tools/perf/builtin-record.c | |
| parent | perf report: Document '--call-graph' better for usage (diff) | |
| download | linux-dev-984028075794c00cbf4fb1e94bb6233e8be08875.tar.xz linux-dev-984028075794c00cbf4fb1e94bb6233e8be08875.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/builtin-record.c | 34 |
1 files changed, 24 insertions, 10 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index d3981ac50e1d..6b77b285fe10 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -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) |