* Alexey Vlasov <ren...@renton.name> wrote:
> On Sun, Aug 25, 2013 at 04:28:37PM +0200, Peter Zijlstra wrote:
>
> > and a function (or function-graph)
> > trace for when this happens?
>
> Unfortunately I could not make trace.
> First when migration threads start to eat CPUs and when I turn on trace:
> # echo function > current_tracer
> # echo 1 > tracing_on
> then server is down at once. LA comes up to several thousands, it stops
> to receive commands. Sometimes I even have to reboot it.
Could you try the latest -tip tree at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
In particular this fix:
5a8e01f8fa51 sched/cputime: Do not scale when utime == 0
Could perhaps fix the phantom CPU overhead you are seeing?
Thanks,
Ingo
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