linux-kernel - Re: 2.6.28-rc8 big regression in VM

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Message-ID: <20081217130218.GA22620@localhost>
Date:	Wed, 17 Dec 2008 21:02:18 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bill Davidsen <davidsen@....com>
Subject: Re: 2.6.28-rc8 big regression in VM

On Wed, Dec 17, 2008 at 02:49:04PM +0200, Lukas Hejtmanek wrote:
> On Wed, Dec 17, 2008 at 08:44:21PM +0800, Wu Fengguang wrote:
> > So the cache memory shrinks a lot.
> >
> > Maybe your 'free' command is reporting wrong numbers?
> > Or it's not a quite reproducible problem?
>
> it depends, I think that 100MB of caches which is not dropped is not quite OK.
>
> While using the system without reboots for a long time, 'undroppable' amount
> of caches rises until the system is unusable.

The mapped file pages are not easily dropped:

  Mapped:            73380 kB     =>   73384 kB

You can check this number when the system becomes somehow unusable.  The
/proc/filecache interface can also help you identify which files/pages
tend to stick in memory.

Thanks,
Fengguang

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