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authorFrederic Weisbecker <fweisbec@gmail.com>2010-05-02 22:05:29 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-05-09 13:43:42 +0200
commit984028075794c00cbf4fb1e94bb6233e8be08875 (patch)
tree80c925f948cce8132dde8ec9307854365d363aff /tools/perf/builtin-record.c
parente157eb8341e7885ff2d9f1620155e3da6e0c8f56 (diff)
downloadlinux-2.6.34-ux500-984028075794c00cbf4fb1e94bb6233e8be08875.tar.gz
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 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c34
1 files changed, 24 insertions, 10 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d3981ac50e1..6b77b285fe1 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)