linux-kernel - Re: [rfc] lru_add_drain

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Message-ID: <alpine.DEB.1.10.0909101402340.13682@V090114053VZO-1>
Date:	Thu, 10 Sep 2009 14:03:55 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	linux-mm <linux-mm@...ck.org>,
	Oleg Nesterov <onestero@...hat.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [rfc] lru_add_drain_all() vs isolation

On Thu, 10 Sep 2009, KOSAKI Motohiro wrote:

> How about this?
>   - pass 1-2,  lru_add_drain_all_async()
>   - pass 3-10, lru_add_drain_all()
>
> this scheme might save RT-thread case and never cause regression. (I think)

Sounds good.

> The last remain problem is, if RT-thread binding cpu's pagevec has migrate
> targetted page, migration still face the same issue.
> but we can't solve it...
> RT-thread must use /proc/sys/vm/drop_caches properly.

A system call "sys_os_quiet_down" may be useful. It would drain all
caches, fold counters etc etc so that there will be no OS activities
needed for those things later.

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