openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

perf tools: Fix bug in raw sample parsing 

In perf_event__parse_sample(), the array variable was not incremented
by the amount of data used by the raw_data.

That was okay until we added PERF_SAMPLE_BRANCH_STACK which depends on
the array variable pointing to the beginning of the branch stack data.

But that was not the case if branch stack was combined with raw mode
sampling. That led to bogus branch stack addresses and count.

The bug would show up with:
$ perf record -R -b foo

This patch fixes the problem by correctly moving the array pointer
forward for RAW samples.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120317222317.GA8803@quad
[ committer note: Fix also later submitted by Jiri Olsa ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Stephane Eranian 2012-03-17 23:23:18 +01:00 committed by Arnaldo Carvalho de Melo
parent 6d4818c524
commit fa30c964c0
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/util/evsel.c
View File

@ -580,6 +580,8 @@ int perf_event__parse_sample(const union perf_event *event, u64 type,
return -EFAULT;
data->raw_data = (void *) pdata;
array = (void *)array + data->raw_size + sizeof(u32);
}
if (type & PERF_SAMPLE_BRANCH_STACK) {