linux-kernel - [PATCH 24/27] perf probe: Init symbol as kprobe

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Message-ID: <1441523623-152703-25-git-send-email-wangnan0@huawei.com>
Date:	Sun, 6 Sep 2015 07:13:40 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...hat.com>, <ast@...mgrid.com>,
	<masami.hiramatsu.pt@...achi.com>, <namhyung@...nel.org>
CC:	<a.p.zijlstra@...llo.nl>, <brendan.d.gregg@...il.com>,
	<daniel@...earbox.net>, <dsahern@...il.com>, <hekuang@...wei.com>,
	<jolsa@...nel.org>, <lizefan@...wei.com>, <paulus@...ba.org>,
	<wangnan0@...wei.com>, <xiakaixu@...wei.com>, <pi3orama@....com>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 24/27] perf probe: Init symbol as kprobe

Before this patch, add_perf_probe_events() init symbol maps only for
uprobe if the first 'struct perf_probe_event' passed to it is a uprobe
event. This is a trick because 'perf probe''s command line syntax
constrains the first elements of the probe_event arrays must be kprobes
if there is one kprobe there.

However, with the incoming BPF uprobe support, that constrain is not
hold since 'perf record' will also probe on k/u probes through BPF
object, and is possible to pass an array with kprobe but the first
element is uprobe.

This patch init symbol maps for kprobes even if all of events are
uprobes, because the extra cost should be small enough.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: David Ahern <dsahern@...il.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kaixu Xia <xiakaixu@...wei.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
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Link: http://lkml.kernel.org/n/1436445342-1402-39-git-send-email-wangnan0@huawei.com
---
 tools/perf/util/probe-event.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5964ecc..7f65197 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2746,7 +2746,7 @@ int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs)
 {
 	int i, ret;
 
-	ret = init_symbol_maps(pevs->uprobes);
+	ret = init_symbol_maps(false);
 	if (ret < 0)
 		return ret;
 
-- 
2.1.0

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