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| author | He Kuang <hekuang@huawei.com> | 2015-04-13 14:41:28 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-04-13 23:25:22 +0300 |
| commit | 9d7b45c5721dfd524666bc1f07cf7d0855edb4d5 (patch) | |
| tree | 77998fa668e524056ceb42b5e321dfcff3d2324a /tools | |
| parent | 0d68bc92c48167130b61b449f08be27dc862dba2 (diff) | |
| download | linux-9d7b45c5721dfd524666bc1f07cf7d0855edb4d5.tar.xz | |
perf probe: Set retprobe flag when probe in address-based alternative mode
When perf probe searched in a debuginfo file and failed, it tried with
an alternative, in function get_alternative_probe_event():
memcpy(tmp, &pev->point, sizeof(*tmp));
memset(&pev->point, 0, sizeof(pev->point));
In this case, it drops the retprobe flag and forgets to set it back in
find_alternative_probe_point(), so the problem occurs.
Can be reproduced as following:
$ perf probe -v -k vmlinux --add='sys_write%return'
...
Added new event:
Writing event: p:probe/sys_write _stext+1584952
probe:sys_write (on sys_write%return)
$ cat /sys/kernel/debug/tracing/kprobe_events
p:probe/sys_write _stext+1584952
After this patch:
$ perf probe -v -k vmlinux --add='sys_write%return'
Added new event:
Writing event: r:probe/sys_write SyS_write+0
probe:sys_write (on sys_write%return)
$ cat /sys/kernel/debug/tracing/kprobe_events
r:probe/sys_write SyS_write
Signed-off-by: He Kuang <hekuang@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1428925290-5623-1-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/probe-event.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 30545ce2c712..5483d98236d3 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -332,6 +332,7 @@ static int find_alternative_probe_point(struct debuginfo *dinfo, else { result->offset += pp->offset; result->line += pp->line; + result->retprobe = pp->retprobe; ret = 0; } |