linux-kernel - Re: [PATCH] vmscan: raise the bar to PAGEOUT_IO

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Message-ID: <AANLkTikG7UOSh=iH02YwO0ihpu2waKt3bHH7LLK-33MP@mail.gmail.com>
Date:	Sat, 31 Jul 2010 21:09:35 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andreas Mohr <andi@...as.de>, Bill Davidsen <davidsen@....com>,
	Ben Gamari <bgamari.foss@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [PATCH] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls

On Sat, Jul 31, 2010 at 8:59 PM, Christoph Hellwig <hch@...radead.org> wrote:
> On Sat, Jul 31, 2010 at 08:55:57PM +0300, Pekka Enberg wrote:
>> Do you have CONFIG_SLUB enabled? It does high order allocations by
>> default for performance reasons.
>
> Yes. This is a kernel using slub.

You can pass "slub_debug=o" as a kernel parameter to disable higher
order allocations if you want to test things. The per-cache default
order is calculated in calculate_order() of mm/slub.c. How many CPUs
do you have on your system?
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