linux-kernel - Re: High priority tasks break SMP balancer?

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Message-ID: <20071120180643.GD4736@vmware.com>
Date:	Tue, 20 Nov 2007 10:06:43 -0800
From:	Micah Dowty <micah@...are.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Christoph Lameter <clameter@....com>,
	Kyle Moffett <mrmacman_g4@....com>,
	Cyrus Massoumi <cyrusm@....net>,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Mike Galbraith <efault@....de>,
	Paul Menage <menage@...gle.com>,
	Peter Williams <pwil3058@...pond.net.au>
Subject: Re: High priority tasks break SMP balancer?

On Tue, Nov 20, 2007 at 06:57:55AM +0100, Ingo Molnar wrote:
> 
> * Micah Dowty <micah@...are.com> wrote:
> 
> > > this one is being triggered whenever a cpu becomes idle (schedule() 
> > > --> idle_balance() --> load_balance_newidle()).
> > > 
> > > (this flag is a bit #1 == 2)
> > > 
> > > cat /proc/sys/kernel/sched_domain/cpu0/domain0/flags
> > 
> > Hmm. I don't have this file on my system:
> > 
> > root@...ah-64:/proc/sys/kernel/sched_domain/cpu0/domain0# ls
> > busy_factor  busy_idx  forkexec_idx  idle_idx  imbalance_pct  max_interval  min_interval  newidle_idx  wake_idx
> > root@...ah-64:/proc/sys/kernel/sched_domain/cpu0/domain0# uname -a
> > Linux micah-64 2.6.23.1 #1 SMP Fri Nov 2 12:25:47 PDT 2007 x86_64 GNU/Linux
> > 
> > Is there a config option I'm missing?
> 
> yes, CONFIG_SCHED_DEBUG.

I have that one. I even posted the /proc/sched_debug output :)

--Micah

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