linux-kernel - [PATCH v2] perf test: Fix false TEST

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Message-ID: <1450166966-135536-1-git-send-email-wangnan0@huawei.com>
Date:	Tue, 15 Dec 2015 08:09:26 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<acme@...nel.org>, <namhyung@...nel.org>, <jolsa@...nel.org>,
	<adrian.hunter@...el.com>, <a.p.zijlstra@...llo.nl>,
	<masami.hiramatsu.pt@...achi.com>
CC:	<linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>,
	"Arnaldo Carvalho de Melo" <acme@...hat.com>
Subject: [PATCH v2] perf test: Fix false TEST_OK result for 'perf test hist'

Commit 71d6de64feddd4b455555326fba2111b3006d9e0 ('perf test: Fix hist
testcases when kptr_restrict is on') solves a double free problem when
'perf test hist' calling setup_fake_machine(). However, the result is
still incorrect. For example:

 $ ./perf test -v 'filtering hist entries'
 25: Test filtering hist entries                              :
 --- start ---
 test child forked, pid 4186
 Cannot create kernel maps
 test child finished with 0
 ---- end ----
 Test filtering hist entries: Ok

In this case the body of this test is not get executed at all, but the
result is 'Ok'.

Actually, in setup_fake_machine() there's no need to create real kernel
maps. What we want is the fake maps. This patch removes the
machine__create_kernel_maps() in setup_fake_machine(), so it won't be
affected by kptr_restrict setting.

Test result:

 $ cat /proc/sys/kernel/kptr_restrict
 1
 $ ~/perf test -v hist
 15: Test matching and linking multiple hists                 :
 --- start ---
 test child forked, pid 24031
 test child finished with 0
 ---- end ----
 Test matching and linking multiple hists: Ok
 [SNIP]

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Suggested-by: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/tests/hists_common.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/tools/perf/tests/hists_common.c b/tools/perf/tests/hists_common.c
index bcfd081..071a8b5 100644
--- a/tools/perf/tests/hists_common.c
+++ b/tools/perf/tests/hists_common.c
@@ -87,11 +87,6 @@ struct machine *setup_fake_machine(struct machines *machines)
 		return NULL;
 	}
 
-	if (machine__create_kernel_maps(machine)) {
-		pr_debug("Cannot create kernel maps\n");
-		return NULL;
-	}
-
 	for (i = 0; i < ARRAY_SIZE(fake_threads); i++) {
 		struct thread *thread;
 
-- 
1.8.3.4

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