From 4a841d650ea435c69e60675537f158a620697290 Mon Sep 17 00:00:00 2001 From: Jovi Zhang Date: Sun, 15 Jul 2012 03:03:10 +0800 Subject: 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 Cc: Ingo Molnar Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/CACV3sbLF8taiCq_VYW-sgRJyupeMzg58C7ZXfMe3xZUiH_Mx6w@mail.gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-events.c | 1 + 1 file changed, 1 insertion(+) (limited to 'tools') 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); } -- cgit v1.2.3-18-g5258