Date: Wed, 17 Dec 2008 21:02:18 +0800
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
Message-ID: <20081217130218.GA22620@localhost>
References: <20081213012115.GA6250@localhost> <20081213095815.GA7143@ics.muni.cz> <20081215011645.GA9707@localhost> <20081215094409.GA4422@ics.muni.cz> <20081216045938.GA1000@localhost> <20081216195219.GA4480@ics.muni.cz> <20081217122726.GA21356@localhost> <20081217123307.GF4480@ics.muni.cz> <20081217124421.GA22317@localhost> <20081217124904.GG4480@ics.muni.cz>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20081217124904.GG4480@ics.muni.cz>
User-Agent: Mutt/1.5.18 (2008-05-17)
Sender: linux-kernel-owner@vger.kernel.org

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/