Messages in this thread | | | Subject | Re: [RFC][PATCH 00/11] perf pmu interface -v2 | From | Peter Zijlstra <> | Date | Fri, 25 Jun 2010 16:50:01 +0200 |
| |
On Fri, 2010-06-25 at 15:36 +0100, Will Deacon wrote: > 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.
Ooh, neat toy ;-)
> 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?
/me goes build that exact tree on his x86_64.. and gets:
# perf stat -a -e cs -e cycles -e instructions -- ls > /dev/null
Performance counter stats for 'ls':
51 context-switches 24963513 cycles 9225808 instructions # 0.370 IPC
0.002389051 seconds time elapsed
Not exactly sure how I could have messed up the ARM architecture code to make this happen though... will have a peek.
| |