linux-kernel - Re: [PATCH] fix to putback_lru_page()/unevictable page handling rework v3

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Date:	Tue, 24 Jun 2008 13:48:28 -0400
From:	Lee Schermerhorn <Lee.Schermerhorn@...com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] fix to putback_lru_page()/unevictable page handling
	rework v3

On Wed, 2008-06-25 at 02:35 +0900, KOSAKI Motohiro wrote:
> > 'lru' was not being set to 'UNEVICTABLE when page was, in fact,
> > unevictable [really "nonreclaimable" :-)], so retry would never
> > happen, and culled pages never counted.
> >
> > Also, redundant mem_cgroup_move_lists()--one with incorrect 'lru',
> > in the case of unevictable pages--messes up memcontroller tracking [I think].
> 
> indeed.
> sorry, I forgot to send this fix.
> 
> Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> 
> but I still happend panic on usex and nishimura-san's cpuset migration test.
>   -> http://marc.info/?l=linux-mm&m=121375647720110&w=2
> 

I saw the description of the cpuset migration test.  Have you wrapped
this in a script suitable for running under usex?  If so, I would like
to get a copy.  Actually, please send me any automation you have for
this test and I'll incorporate it into the usex load.  Meanwhile, I'll
take a cut at adding such a test to the load.  However, we know that
your version can provoke the panic, so I'd like to get that.

> 
> I'll  investigate it tommorow.

Later, then,
Lee



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