linux-kernel - perf: odd event scheduling issue

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Date:	Tue, 19 May 2015 23:07:09 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: perf: odd event scheduling issue

Hello

so I'm running 4.1-rc4 on my Haswell machine and a lot of my perf_event 
testsuite is failing.  There seems to be weird event scheduling issues.

I can reproduce it with plain perf; simple event groups that should work 
fine can't be scheduled.

vince@...well:~$ perf stat -e \{cycles,instructions\} sleep 1

 Performance counter stats for 'sleep 1':

     <not counted>      cycles                   
     <not counted>      instructions             

       1.003414661 seconds time elapsed

I just wanted to check to see if this was a known problem before I started 
bisecting.  I was also possibly seeing this with 4.1-rc2.

Vince
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