linux-kernel - Re: [PATCH] perf: fix perf test case 14 result reporting

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Message-ID: <20170602140936.GO2899@kernel.org>
Date:   Fri, 2 Jun 2017 11:09:36 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Thomas-Mich Richter <tmricht@...ux.vnet.ibm.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux390-list@...maker.boeblingen.de.ibm.com
Subject: Re: [PATCH] perf: fix perf test case 14 result reporting

Em Fri, Jun 02, 2017 at 11:58:46AM +0200, Thomas-Mich Richter escreveu:
> On 06/01/2017 11:04 PM, Jiri Olsa wrote:
> > On Thu, Jun 01, 2017 at 10:20:38AM -0300, Arnaldo Carvalho de Melo wrote:
> >> 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@...lp76 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@...ux.vnet.ibm.com>
> >>> Reviewed-by: Hendrik Brueckner <brueckner@...ux.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
> > 
> > seems ok, however "perf test attr" is broken ATM, since it wasn't updated
> > for some time as it showed false 'Ok'
> > 
> > I started fixing it some time ago, but got distracted, if you are
> > interested, you're welcome to pick up from my branch ;-)
> > 
> >   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> >   perf/attr_test
> > 
> > thanks,
> > jirka
> > 
> 
> I have started work on perf tool very recently to get s390 support
> working and up to date.
> 
> I downloaded your branch and discovered you have already fixed
> another issue I run into this week. For example 
> commit 070b9644981e ("perf tests attr: Do not store failed events")
> 
> I can certainly help you to get this test case operational again.
> Maybe you need to pull some of your patches out of your backlog
> and submit them the kernel to get to a common base to work on.
> 
> I suggest we should move the discussion to the linux-perf-users
> mailing list.
> 
> Your thoughts?

If you have specific patches in Jiri's branch that you think are good to
go, just point me to them and I'll cherry-pick them.

I'm looking now at the one you pointed out above (070b9644981e).

Thanks,

- Arnaldo