Re: [PATCH 11/53] perf test: Fix false TEST_OK result for 'perf test hist'

Em Mon, Jan 11, 2016 at 05:25:48PM +0300, Sergei Shtylyov escreveu:

On 01/11/2016 04:48 PM, Wang Nan wrote:

quoted

Commit 71d6de64feddd4b455555326fba2111b3006d9e0 ('perf test: Fix hist
testcases when kptr_restrict is on') solves a double free problem when

   You didn't run this patch thru scripts/checkpatch.pl, I guess? A
certain commit citing style is enforced now, and yours doesn't quite
match it...

Which is? /me goes to read checpatch.pl...

- Arnaldo
 

quoted

'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 <redacted>
Suggested-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <redacted>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <redacted>

[...]

MBR, Sergei