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

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Date:	Thu, 25 Dec 2008 18:50:01 +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.

Hi Lukas,

Did the undroppable memory keep growing?

If not, we could take it as a feature instead of bug: the memory
mapped pages are being protected from being freed.  It's not a
regression either: the feature was there before 2.6.27.

But sure we change that if it's not the desirable behavior.

Thanks,
Fengguang

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