Messages in this thread | | | Date | Wed, 18 Sep 2013 12:12:53 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH 0/4] perf tools: New comm infrastructure |
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Em Wed, Sep 18, 2013 at 11:20:38AM -0300, Arnaldo Carvalho de Melo escreveu: > Em Tue, Sep 17, 2013 at 02:54:22PM +0900, Namhyung Kim escreveu: > > On Sat, 14 Sep 2013 08:11:49 +0200, Ingo Molnar wrote: > > > * Frederic Weisbecker <fweisbec@gmail.com> wrote: > > >> My patches and Namhyung's should improve the comm situation a lot but we > > >> can't do much miracle. The only way would be perhaps to be able to limit > > > > > >> > > >> Now may be we can find other big contention point in perf. It's possible > > >> we also have some endless loop somewhere. > > > > > > Well, it was the 100,000+ step linear list walk that was causing 90% of > > > the slowness here. Namhyung's patch should dramatically improve that. I > > > guess time for someone to post a combined tree so that it can be tested > > > all together?
> > I pushed combined tree to 'perf/callchain-v2' branch in my tree
> > git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
> But you did it for some old tree, as I tried running it now and since my > big perf.data file has PERF_RECORD_MMAP2 records, I can't try it with > your branch, working on cherry picking those changesets, since a plain > rebase didn't work.
Cherry picking just:
commit ad3c9edd70122c8776bc0735287daba3945e328a Author: Namhyung Kim <namhyung.kim@lge.com> Date: Mon Sep 9 17:05:38 2013 +0900
perf callchain: Convert children list to rbtree
I go from too-long-to-wait to:
[root@sandy ~]# echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor [acme@sandy linux]$ taskset -c 3 perf stat --null --sync --repeat 3 perf report -i perf.data.make-j8-kernel > /dev/null
Performance counter stats for 'perf report -i perf.data.make-j8-kernel' (3 runs):
79.158464654 seconds time elapsed ( +- 0.15% )
[acme@sandy linux]$ [acme@sandy linux]$ ls -lah perf.data.make-j8-kernel -rw-------. 1 acme acme 2.3G Sep 16 11:56 perf.data.make-j8-kernel
Looking at the other patches, modulo the ones that do the progress bar updating while collapsing, as they clash with a patch from Jiri Olsa.
- Arnaldo
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