linux-kernel - [tip:perf/core] perf probe: Load map before glob matching

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Date:	Wed, 20 May 2015 05:23:27 -0700
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, namhyung@...nel.org, linux-kernel@...r.kernel.org,
	masami.hiramatsu.pt@...achi.com, paulus@...ba.org, hpa@...or.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, lizefan@...wei.com,
	mingo@...nel.org, wangnan0@...wei.com
Subject: [tip:perf/core] perf probe: Load map before glob matching

Commit-ID:  75e4a2a6af15e956993913314ced2582b350a647
Gitweb:     http://git.kernel.org/tip/75e4a2a6af15e956993913314ced2582b350a647
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Fri, 15 May 2015 12:14:44 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 18 May 2015 10:16:48 -0300

perf probe: Load map before glob matching

Commit 4c859351226c920b227fec040a3b447f0d482af3 ("perf probe: Support
glob wildcards for function name") introduces a problem:

  # /root/perf probe kmem_cache_free
 Failed to find symbol kmem_cache_free in kernel
   Error: Failed to add events.

The reason is the replacement of map__for_each_symbol_by_name() (by
map__for_each_symbol()). Although their names are similar,
map__for_each_symbol doesn't call map__load() and dso__sort_by_name()
before searching. The missing of map__load() causes this problem because
it search symbol before load dso map.

This patch ensures map__load() is called before using
map__for_each_symbol().

After this patch:

 # /root/perf probe kmem_cache_free
  Added new event:
    probe:kmem_cache_free (on kmem_cache_free%return)

You can now use it in all perf tools, such as:

        perf record -e probe:kmem_cache_free -aR sleep 1

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1431692084-46287-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 2399dc4..1faa1e6 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2499,6 +2499,9 @@ static int find_probe_functions(struct map *map, char *name)
 	struct symbol *sym;
 	struct rb_node *tmp;
 
+	if (map__load(map, NULL) < 0)
+		return 0;
+
 	map__for_each_symbol(map, sym, tmp) {
 		if (strglobmatch(sym->name, name))
 			found++;
--
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