Commit-ID: 35a23ff928b066b00a826d0a9ed9411b8ab479ef
Gitweb: http://git.kernel.org/tip/35a23ff928b066b00a826d0a9ed9411b8ab479ef
Author: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
AuthorDate: Fri, 12 Jun 2015 14:08:20 +0900
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Fri, 12 Jun 2015 16:14:48 -0300
perf probe: Cut off the gcc optimization postfixes from function name
Cut off the postfixes which gcc added for optimized routines from the
event name automatically generated from symbol name, since *probe-events
doesn't accept it. Those symbols will be used if we don't use debuginfo
to find target functions.
E.g. without this fix;
-----
# perf probe -va alloc_buf.isra.23
probe-definition(0): alloc_buf.isra.23
symbol:alloc_buf.isra.23 file:(null) line:0 offset:0 return:0 lazy:(null)
[...]
Opening /sys/kernel/debug/tracing/kprobe_events write=1
Added new event:
Writing event: p:probe/alloc_buf.isra.23 _text+4869328
Failed to write event: Invalid argument
Error: Failed to add events. Reason: Invalid argument (Code: -22)
-----
With this fix;
-----
perf probe -va alloc_buf.isra.23
probe-definition(0): alloc_buf.isra.23
symbol:alloc_buf.isra.23 file:(null) line:0 offset:0 return:0 lazy:(null)
[...]
Opening /sys/kernel/debug/tracing/kprobe_events write=1
Added new event:
Writing event: p:probe/alloc_buf _text+4869328
probe:alloc_buf (on alloc_buf.isra.23)
You can now use it in all perf tools, such as:
perf record -e probe:alloc_buf -aR sleep 1
-----
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Naohiro Aota <naota@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20150612050820.20548.41625.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/util/probe-event.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d4cf50b..daa24a2 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2316,6 +2316,7 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
struct strlist *namelist, bool allow_suffix)
{
int i, ret;
+ char *p;
if (*base == '.')
base++;
@@ -2326,6 +2327,10 @@ static int get_new_event_name(char *buf, size_t len, const char *base,
pr_debug("snprintf() failed: %d\n", ret);
return ret;
}
+ /* Cut off the postfixes (e.g. .const, .isra)*/
+ p = strchr(buf, '.');
+ if (p && p != buf)
+ *p = '\0';
if (!strlist__has_entry(namelist, buf))
return 0;
--
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