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From: Wu Fengguang <fengguang.wu@intel.com>
To: Lukas Hejtmanek <xhejtman@ics.muni.cz>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Bill Davidsen <davidsen@tmr.com>
Subject: Re: 2.6.28-rc8 big regression in VM
Date: Thu, 25 Dec 2008 18:50:01 +0800	[thread overview]
Message-ID: <20081225105001.GC15733@localhost> (raw)
In-Reply-To: <20081217124904.GG4480@ics.muni.cz>

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


  parent reply	other threads:[~2008-12-25 10:50 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-12 18:38 2.6.28-rc8 big regression in VM Lukas Hejtmanek
2008-12-13  1:21 ` Wu Fengguang
2008-12-13  9:58   ` Lukas Hejtmanek
2008-12-13 14:02     ` Wu Fengguang
2008-12-16 21:08       ` Bill Davidsen
2008-12-15  1:16     ` Wu Fengguang
2008-12-15  2:05       ` KOSAKI Motohiro
2008-12-15  9:53         ` Lukas Hejtmanek
2008-12-15 10:56           ` KOSAKI Motohiro
2008-12-15  9:44       ` Lukas Hejtmanek
2008-12-16  4:59         ` Wu Fengguang
     [not found]           ` <20081216195219.GA4480@ics.muni.cz>
2008-12-17 12:27             ` Wu Fengguang
2008-12-17 12:33               ` Lukas Hejtmanek
2008-12-17 12:44                 ` Wu Fengguang
2008-12-17 12:49                   ` Lukas Hejtmanek
2008-12-17 13:02                     ` Wu Fengguang
2008-12-25 10:50                     ` Wu Fengguang [this message]
2008-12-25 10:58                       ` Lukas Hejtmanek
2008-12-25 11:18                         ` Wu Fengguang

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