On Wednesday 31 August 2011 08:26 PM, Dave Martin wrote: > On Thu, Aug 25, 2011 at 04:48:57PM -0500, Tom Gall wrote: >> Hi all, >> >> Say has anyone else run oprofile on recent builds on panda? >> >> By recent I mean say anything since 11.07? Reason for asking is I'm >> seeing basically a very very small number of samples being recorded... >> as in there's no way this is right. > > These days, I believe the separate oprofile backend for ARM has gone > away, and oprofile is implemented using the perf backend anyway. > > So, perhaps a more interesting question is: does perf work? > > See whether this works: > > apt-get install linux-linaro-tools-`uname -r` > perf stat apt-get update # or something > > > I think there was an issue with a patch which enabled perf on omap4 > but broke it on all other platforms. This patch is present in the > linux-linaro-natty tree, but I can't see it in -oneiric. I think > it may have been dropped / backed out from the oneiric tree because > of the problems it caused: > > In linux-linaro-natty/master: > commit 457520e3fbce80812c6901c226ec242fdb906c63 > (arm: pmu: support pmu/perf on OMAP4)
The perf patch was dropped from linux-linaro-2.6.39 onwards as it apparently caused Panda boot hang (https://bugs.launchpad.net/linux-linaro/+bug/802693). > > Mark Rutland posted a patch to fix the introduced problem -- > search the linaro-dev archives for > [PATCH] Fix NULL-dereference introduced by OMAP4 PMU patch > > > ...however, I don't know whether or not this is still relevant. > > > > If perf works but oprofile doesn't, that's a separate problem and > should be investigated. You might want to consider switching to > perf anyway though -- in my experience it's less problem-prone > than using oprofile. > > Cheers > ---Dave > > Regards, Avik _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
