linux-kernel - Re: [PATCH] memory hotplug: run lru_add_drain

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Message-Id: <20081207133450.53D8.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Sun,  7 Dec 2008 13:43:14 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	kosaki.motohiro@...fujitsu.com, gerald.schaefer@...ibm.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, kamezawa.hiroyu@...fujitsu.com,
	y-goto@...fujitsu.com, npiggin@...e.de
Subject: Re: [PATCH] memory hotplug: run lru_add_drain_all() on each cpu

CC to Lee Schermerhorn


> On Fri, 2008-12-05 at 14:08 +0100, Gerald Schaefer wrote:
> > 
> > As explained above, the per-cpu pagevec layout should be independent
> > from NUMA or UNEVICTABLE_LRU, so I guess the right thing to do here
> > is completely remove the #ifdef as in the patch from Kosaki Motohiro
> > (or at least replace it with a CONFIG_SMP as suggested by Kamezawa
> > Hiroyuki).
> 
> Thanks for looking into it deeper.  That CONFIG_SMP thing really does
> look like the right solution.

Lee, Could you read this thread and explain why you add ifdef CONFIG_UNEVICTABLE_LRU?
I am not sure about that Dave's proposal is safe change. (but I guess he is right)




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