linux-kernel - Re: [RFC][PATCH 00/11] perf pmu interface -v2

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Message-ID: <1277476604.24751.8.camel@e102144-lin.cambridge.arm.com>
Date:	Fri, 25 Jun 2010 15:36:44 +0100
From:	Will Deacon <will.deacon@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	paulus <paulus@...ba.org>,
	stephane eranian <eranian@...glemail.com>,
	Robert Richter <robert.richter@....com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Yanmin <yanmin_zhang@...ux.intel.com>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 00/11] perf pmu interface -v2

Hello,

On Fri, 2010-06-25 at 12:16 +0100, Peter Zijlstra wrote:
> I seem to have lost a refresh before sending the emails, please check:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-perf.git perf-pmu
> 
> I pushed out updated patches there.

Ok, I rebuilt my Kernel and perf tools from that tree and tested it on a
quad-core ARMv7 board. Per-task counters appear to work (software and
hardware) but pinned hardware counters always return 0:


root@...l-lucid-nfs:~# perf stat -a -e cs -e cycles -e instructions -- ls
linux-2.6  tmp

 Performance counter stats for 'ls':

                 33  context-switches        
                  0  cycles                  
                  0  instructions             #      0.000 IPC  

        0.028572009  seconds time elapsed


It's odd if only ARM is affected in this way. Do pinned events still work
for other people?

Will

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