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

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Message-ID: <20071119230516.GC4736@vmware.com>
Date:	Mon, 19 Nov 2007 15:05:16 -0800
From:	Micah Dowty <micah@...are.com>
To:	Dmitry Adamushko <dmitry.adamushko@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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 Mon, Nov 19, 2007 at 11:22:06PM +0100, Dmitry Adamushko wrote:
> You seem to have a configuration with domains which don't have
> SD_BALANCE_NEWIDLE  on (CONFIG_NUMA?) as there are no events (all
> zeros above) for CPU_NEWLY_IDLE.
> 
> 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?

Thanks,
--Micah

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