linux-kernel - Re: [PATCH] sched: fix autogroup nice tune on UP

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Date:	Mon, 24 Jan 2011 11:17:34 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Michael Witten <mfwitten@...il.com>,
	linux-kernel@...r.kernel.org,
	Christian Kujau <christian@...dbynature.de>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] sched: fix autogroup nice tune on UP

On Sun, Jan 23, 2011 at 11:16 PM, Pekka Enberg <penberg@...nel.org> wrote:
>> tg->se->load, the reason is update_cfs_shares()
>> do nothing on SMP.
>
> Typo here? You mean UP, right?

Ah, Yeah. Thanks for pointing it.

>
> I'm not an expert on the scheduler but this looks like the wrong thing
> to do. Shouldn't you fix update_cfs_shares() to work on UP properly?
>

I have through about that. No-poking on update_cfs_shares() is because
update_cfs_shares() is called at several hot path, like enqueue_entity()/
dequeue_entity(), but it doesn't make sense on UP.

But I guess you are right. We still need to update the load of cfs_rq
after update_load_set() is called even on UP, so
update_cfs_shares() is the suitable place to do that.

Will take another look at update_cfs_shares().

Thanks,
Yong

-- 
Only stand for myself
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