linux-kernel - Re: [PATCH 06/40] sched: add wakeup/sleep sched

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Message-ID: <4B56C314.7000908@kernel.org>
Date:	Wed, 20 Jan 2010 17:47:16 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	torvalds@...ux-foundation.org, mingo@...e.hu, awalls@...ix.net,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, jens.axboe@...cle.com,
	rusty@...tcorp.com.au, cl@...ux-foundation.org,
	dhowells@...hat.com, arjan@...ux.intel.com, avi@...hat.com,
	johannes@...solutions.net, andi@...stfloor.org,
	Mike Galbraith <efault@....de>
Subject: Re: [PATCH 06/40] sched: add wakeup/sleep sched_notifiers and allow
 NULL notifier ops

Hello,

On 01/19/2010 05:55 PM, Peter Zijlstra wrote:
> I think so, still doing a wakeup from a wakeup sounds like trouble in
> that it has the potential to a thundering herd, so I'd really rather
> you'd not do something like that.

cmwq is not gonna do that and if someone is gonna do that there of
course needs to be some sort of limiting.

I still feel a bit uneasy about calling out external callbacks before
scheduler internal state update is complete.  If you still think
moving it right below activate_task() would be better, I'll move it
and modify the comment above try_to_wake_up_local().  Please let me
know what you think.

Thanks.

-- 
tejun
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