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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-09-17 19:59:05 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-17 22:08:27 +0200
commit8b412664d0a487c2e16ac43f4fcede346df33254 (patch)
tree75914df712d93dcbf6fc82f80f4f2ecb6ce19e7d /tools/perf/builtin-record.c
parent2667de81f3256c944b06abdf2c56c2f192fcb724 (diff)
downloadlinux-2.6.34-ux500-8b412664d0a487c2e16ac43f4fcede346df33254.tar.gz
perf record: Disable profiling before draining the buffer
I noticed that perf-record continues profiling itself after the child terminated and we're draining the buffer. This can cause a _lot_ of overhead with --all recording - we keep and keep recording, which produces new and new events. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 5f3127e7a61..2459e5a22ed 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -524,6 +524,7 @@ static int __cmd_record(int argc, const char **argv)
pid_t pid = 0;
int flags;
int ret;
+ unsigned long waking = 0;
page_size = sysconf(_SC_PAGE_SIZE);
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
@@ -634,10 +635,20 @@ static int __cmd_record(int argc, const char **argv)
if (hits == samples) {
if (done)
break;
- ret = poll(event_array, nr_poll, 100);
+ ret = poll(event_array, nr_poll, -1);
+ waking++;
+ }
+
+ if (done) {
+ for (i = 0; i < nr_cpu; i++) {
+ for (counter = 0; counter < nr_counters; counter++)
+ ioctl(fd[i][counter], PERF_COUNTER_IOC_DISABLE);
+ }
}
}
+ fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
+
/*
* Approximate RIP event size: 24 bytes.
*/