>From cb06e8f21d3875f4ffef46a7627dca88b2c74836 Mon Sep 17 00:00:00 2001
From: Jovi Zhang <bookj...@gmail.com>
Date: Sun, 15 Jul 2012 03:03:10 +0800
Subject: [PATCH] perf: 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 <bookj...@gmail.com>
---
tools/perf/util/parse-events.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 05dbc8b..631aec6 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -592,6 +592,7 @@ 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;
snprintf(name, MAX_NAME_LEN, "mem:%p:%s", ptr, type ? type : "rw");
return add_event(list, idx, &attr, name);
--
1.7.9.7
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