From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
mingo@elte.hu, Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Subject: Re: find_busiest_group using lots of CPU
Date: Tue, 06 Oct 2009 14:04:21 +0200 [thread overview]
Message-ID: <1254830661.21044.275.camel@laptop> (raw)
In-Reply-To: <20091006112006.GO5216@kernel.dk>
On Tue, 2009-10-06 at 13:20 +0200, Jens Axboe wrote:
> > > io_schedule() straight into find_busiest_group() leads me to think this
> > > could be SD_BALANCE_NEWIDLE, does something like:
> > >
> > > for i in /proc/sys/kernel/sched_domain/cpu*/domain*/flags;
> > > do
> > > val=`cat $i`; echo $((val & ~0x02)) > $i;
> > > done
> > >
> > > [ assuming SCHED_DEBUG=y ]
> > >
> > > Cure things?
> >
> > I can try,
>
> It does, it's gone from the profiles.
Hrmm,. ok. I'll go prod at the NEWIDLE bits to see if anything stands
out.
If only perf-annotate could generate annotated C... maybe I'll look at
that.
Thanks!
next prev parent reply other threads:[~2009-10-06 12:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-30 8:18 find_busiest_group using lots of CPU Jens Axboe
2009-10-05 12:31 ` Peter Zijlstra
2009-10-06 7:51 ` Jens Axboe
2009-10-06 11:20 ` Jens Axboe
2009-10-06 11:47 ` Ingo Molnar
2009-10-06 11:56 ` Jens Axboe
2009-10-06 12:04 ` Peter Zijlstra [this message]
2009-10-06 12:14 ` Ingo Molnar
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