linux-kernel - Re: "Test object code reading" failing, debug messages don't help

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Date:	Mon, 11 Nov 2013 16:58:10 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: "Test object code reading" failing, debug messages don't help

Em Mon, Nov 11, 2013 at 04:55:59PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Nov 11, 2013 at 04:51:17PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Hi Adrian,
> > 
> > 	I have perf test failing here:
> > 
> > [root@...andy ~]# perf test 21
> > 21: Test object code reading                               : FAILED!
> > [root@...andy ~]# 
> > 
> > Try it with -v, but all messages, except for that elf header, which I
> > assume is for a previous entry that is not suitable and should not be
> > considered, seems to say all is well, except that the test fails :-\
> 
> If I try gdb on test__code_reading, go on stepping thru it to try to
> figure out why it fails, it works :-\

Why this is so is still unclear, but since the other problem I had was
due to the kernel reducing the max sample_freq, I tried:

[root@...andy ~]# echo 10000 > /proc/sys/kernel/perf_event_max_sample_rate 
[root@...andy ~]# perf test 21
21: Test object code reading                               : Ok
[root@...andy ~]# echo 7000 > /proc/sys/kernel/perf_event_max_sample_rate 
[root@...andy ~]# perf test 21
21: Test object code reading                               : FAILED!
[root@...andy ~]# 

Checking where in this test the sample_freq is set...

- Arnaldo
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