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| author | Jovi Zhang <bookjovi@gmail.com> | 2012-07-15 03:03:10 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-07-25 11:37:46 -0300 |
| commit | 4a841d650ea435c69e60675537f158a620697290 (patch) | |
| tree | 7dcee523821dc1021f9a5f5d09037635fed05311 /tools/perf | |
| parent | f7add556534529ab18501ced98d7f3f2fc7f0621 (diff) | |
| download | linux-3.10-4a841d650ea435c69e60675537f158a620697290.tar.gz linux-3.10-4a841d650ea435c69e60675537f158a620697290.tar.bz2 linux-3.10-4a841d650ea435c69e60675537f158a620697290.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/perf')
| -rw-r--r-- | tools/perf/util/parse-events.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index a729945838f..74a5af4d33e 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); } |