linux-kernel - Re: [PATCH 6/8] Add __GFP_OTHER

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Date:	Thu, 3 Mar 2011 11:33:15 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	akpm@...ux-foundation.org, aarcange@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 6/8] Add __GFP_OTHER_NODE flag

On Wed,  2 Mar 2011 16:45:26 -0800
Andi Kleen <andi@...stfloor.org> wrote:

> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add a new __GFP_OTHER_NODE flag to tell the low level numa statistics
> in zone_statistics() that an allocation is on behalf of another thread.
> This way the local and remote counters can be still correct, even
> when background daemons like khugepaged are changing memory
> mappings.
> 
> This only affects the accounting, but I think it's worth doing that
> right to avoid confusing users.
> 
> I first tried to just pass down the right node, but this required
> a lot of changes to pass down this parameter and at least one
> addition of a 10th argument to a 9 argument function. Using
> the flag is a lot less intrusive.
> 
> Open: should be also used for migration?
> 
> Cc: aarcange@...hat.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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