linux-kernel - Re: [PATCH 3/3] ia64: Call migration code on correctable errors v3

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Message-ID: <20080509210713.GA21370@sgi.com>
Date:	Fri, 9 May 2008 16:07:13 -0500
From:	Russ Anderson <rja@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 3/3] ia64: Call migration code on correctable errors v3

On Fri, May 09, 2008 at 02:03:19PM -0700, Christoph Lameter wrote:
> On Fri, 9 May 2008, Russ Anderson wrote:
> 
> > +	local_irq_save(irq_flags);
> 
> The page migration functions expect to be called in non atomic contexts 
> since they use things like lock_page(). Can you just drop the irq disable? 

Yes.

> The spinlock should not be there either. Page migration serialize via 
> the LRU. Pages that are to be migrated have to be taken off the LRU 
> first. There is no danger of two threads trying to migrate the same 
> page because the second one will not be able to take it off the LRU 
> anymore.

-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@....com
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