linux-kernel - [RFC PATCH 1/3] perf probe: Init symbol as kprobe if any pev is kprobe

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Date:	Thu, 25 Jun 2015 10:37:23 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>, <ast@...mgrid.com>, <brendan.d.gregg@...il.com>,
	<daniel@...earbox.net>, <namhyung@...nel.org>,
	<masami.hiramatsu.pt@...achi.com>, <paulus@...ba.org>,
	<a.p.zijlstra@...llo.nl>, <mingo@...hat.com>, <jolsa@...nel.org>,
	<dsahern@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <lizefan@...wei.com>,
	<hekuang@...wei.com>, <xiakaixu@...wei.com>, <pi3orama@....com>
Subject: [RFC PATCH 1/3] perf probe: Init symbol as kprobe if any pev is kprobe

Before this patch, add_perf_probe_events() init symbol maps only for
uprobe if the first pev passed to it is a uprobe event. However, with
the incoming BPF uprobe support, now it will be possible to pass an
array with combined kprobe and uprobe events to add_perf_probe_events().

This patch check all pevs instead of the first one, and init kernel
symbol if any events is not uprobe.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 tools/perf/util/probe-event.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b386d2f..a2b3026 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2802,8 +2802,21 @@ int cleanup_perf_probe_event(struct perf_probe_event *pev)
 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs, bool cleanup)
 {
 	int i, ret;
+	bool user_only = true;
 
-	ret = init_symbol_maps(pevs->uprobes);
+	/* If any pev is kprobe, init kernel symbols. */
+	for (i = 0; i < npevs; i++) {
+		if (!pevs[i].uprobes) {
+			user_only = false;
+			break;
+		}
+	}
+
+	/*
+	 * Compiler can drop user_only:
+	 *  ret = init_symbol_maps(i >= npevs);
+	 */
+	ret = init_symbol_maps(user_only);
 	if (ret < 0)
 		return ret;
 
-- 
1.8.3.4

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