linux-kernel - Re: [PATCH 26/31] sched: numa: Make mempolicy home-node aware

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Message-ID: <50A3E169.4010402@redhat.com>
Date:	Wed, 14 Nov 2012 13:22:33 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 26/31] sched: numa: Make mempolicy home-node aware

On 11/13/2012 06:12 AM, Mel Gorman wrote:
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>
> Add another layer of fallback policy to make the home node concept
> useful from a memory allocation PoV.
>
> This changes the mpol order to:
>
>   - vma->vm_ops->get_policy	[if applicable]
>   - vma->vm_policy		[if applicable]
>   - task->mempolicy
>   - tsk_home_node() preferred	[NEW]
>   - default_policy

Why is the home node policy not the default policy?

> Note that the tsk_home_node() policy has Migrate-on-Fault enabled to
> facilitate efficient on-demand memory migration.
>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Turner <pjt@...gle.com>
> Cc: Lee Schermerhorn <Lee.Schermerhorn@...com>
> Cc: Christoph Lameter <cl@...ux.com>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Mel Gorman <mgorman@...e.de>




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