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authorFrederic Weisbecker <fweisbec@gmail.com>2010-04-14 22:09:02 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2010-04-15 04:12:52 +0200
commitf92128193094c288bc315db1694fafeaeb7ee1d0 (patch)
tree492e6ead96b08c4a5d8761d75252afb9a084f66a /tools/perf/util/parse-events.c
parentbdef3b02ceeb97f5f67fcfa6dff13c4e70b34fb7 (diff)
downloadlinux-2.6.34-ux500-f92128193094c288bc315db1694fafeaeb7ee1d0.tar.gz
perf: Make the trace events sample period default to 1
Trace events are mostly used for tracing and then require not to be lost when possible. As opposite to hardware events that really require to trigger after a given sample period, trace events mostly need to trigger everytime. It is a frustrating experience to trace with perf and realize we lost a lot of events because we forgot the "-c 1" option. Then default sample_period to 1 for trace events but let the user override it. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'tools/perf/util/parse-events.c')
-rw-r--r--tools/perf/util/parse-events.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 880070c02fd..3b4ec679756 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -422,6 +422,8 @@ parse_single_tracepoint_event(char *sys_name,
attr->sample_type |= PERF_SAMPLE_TIME;
attr->sample_type |= PERF_SAMPLE_CPU;
+ attr->sample_period = 1;
+
snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
sys_name, evt_name);