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Date: Thu, 1 Jun 2017 10:20:38 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Thomas Richter <tmricht@linux.vnet.ibm.com>,
        Jiri Olsa <jolsa@kernel.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] perf: fix perf test case 14 result reporting
Message-ID: <20170601132038.GG2899@kernel.org>
References: <20170601123441.24581-1-tmricht@linux.vnet.ibm.com>
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Em Thu, Jun 01, 2017 at 02:34:41PM +0200, Thomas Richter escreveu:
> Command perf test -v 14 (Setup struct perf_event_attr test)
> always reports success even if the test case fails.
> It works correctly if you also specify -F (for don't fork).

Thanks for working on this, adding Jiri Olsa, that wrote this test
harness, so that he can check and provide his Acked-by or Reviewed-by,
Jiri?

- Arnaldo
 
>    root@s35lp76 perf]# ./perf test -v 14
>    14: Setup struct perf_event_attr               :
>    --- start ---
>    running './tests/attr/test-record-no-delay'
>    [ perf record: Woken up 1 times to write data ]
>    [ perf record: Captured and wrote 0.002 MB /tmp/tmp4E1h7R/perf.data
>      (1 samples) ]
>    expected task=0, got 1
>    expected precise_ip=0, got 3
>    expected wakeup_events=1, got 0
>    FAILED './tests/attr/test-record-no-delay' - match failure
>    test child finished with 0
>    ---- end ----
>    Setup struct perf_event_attr: Ok
> 
> The reason for the wrong error reporting is the return value of the
> system() library call. It is called in run_dir() file tests/attr.c
> and returns the exit status, in above case 0xff00.
> This value is given as parameter to the exit() function which
> can only handle values 0-0xff.
> The child process terminates with exit value of 0 and the parent
> does not detect any error.
> 
> This patch corrects the error reporting and prints the
> correct test result.
> 
> Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com>
> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
> ---
>  tools/perf/tests/attr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/tests/attr.c b/tools/perf/tests/attr.c
> index 88dc51f..131b510 100644
> --- a/tools/perf/tests/attr.c
> +++ b/tools/perf/tests/attr.c
> @@ -150,7 +150,7 @@ static int run_dir(const char *d, const char *perf)
>  	snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
>  		 d, d, perf, vcnt, v);
>  
> -	return system(cmd);
> +	return system(cmd) ? TEST_FAIL : TEST_OK;
>  }
>  
>  int test__attr(int subtest __maybe_unused)
> -- 
> 2.9.3