linux-kernel - Re: [patch v3]numa: add a sysctl to control interleave allocation granularity from each node to improve I/O performance

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Date:	Tue, 13 Dec 2011 11:06:32 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>, Christoph Lameter <cl@...ux.com>,
	lee.schermerhorn@...com, David Rientjes <rientjes@...gle.com>
Subject: Re: [patch v3]numa: add a sysctl to control interleave allocation
 granularity from each node to improve I/O performance

On Mon, Dec 12, 2011 at 09:58:45AM +0800, Shaohua Li wrote:
> If mem plicy is interleaves, we will allocated pages from nodes in a round
> robin way. This surely can do interleave fairly, but not optimal.
> 
> Say the pages will be used for I/O later. Interleave allocation for two pages
> are allocated from two nodes, so the pages are not physically continuous. Later

I would prefer to add a new policy (INTERLEAVE_MULTI or so) for this
instead of a global sysctl, that takes the additional parameter.

Also I don't like having more per task state. Could you compute this
from the address instead even for the process policy case?

-Andi
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