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

From: Will Deacon
Date: Fri Jun 25 2010 - 10:37:17 EST


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:// 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@will-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?


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