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authorJovi Zhang <bookjovi@gmail.com>2012-07-15 03:03:10 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-07-25 11:37:46 -0300
commit4a841d650ea435c69e60675537f158a620697290 (patch)
tree7dcee523821dc1021f9a5f5d09037635fed05311 /tools
parentf7add556534529ab18501ced98d7f3f2fc7f0621 (diff)
downloadblackbird-op-linux-4a841d650ea435c69e60675537f158a620697290.tar.gz
blackbird-op-linux-4a841d650ea435c69e60675537f158a620697290.zip
perf tools: Make the breakpoint events sample period default to 1
There have one problem about hw_breakpoint perf event, as watched, the events reported to userspace is not correctly, sometime one trigger bp_event report several events, sometime bp_event cannot go through to user. The root cause is attr->freq is 1 passed to kernel defaultly in bp events, this make kernel calculate event period not as expect, make sample period to 1 will change attr->freq to 0, to fix this problem. This patch is similar with commit f92128 about tracepoint events: perf: Make the trace events sample period default to 1 Signed-off-by: Jovi Zhang <bookjovi@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/CACV3sbLF8taiCq_VYW-sgRJyupeMzg58C7ZXfMe3xZUiH_Mx6w@mail.gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/parse-events.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index a729945838f5..74a5af4d33ec 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -490,6 +490,7 @@ int parse_events_add_breakpoint(struct list_head **list, int *idx,
attr.bp_len = HW_BREAKPOINT_LEN_4;
attr.type = PERF_TYPE_BREAKPOINT;
+ attr.sample_period = 1;
return add_event(list, idx, &attr, NULL);
}
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