linux-kernel - Re: drop

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Message-ID: <20090305133603.GA22442@localhost>
Date:	Thu, 5 Mar 2009 21:36:03 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Markus <M4rkusXXL@....de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Lukas Hejtmanek <xhejtman@....muni.cz>
Subject: Re: drop_caches ...

Hi Markus,

On Thu, Mar 05, 2009 at 01:55:35PM +0200, Markus wrote:
> > Markus, you may want to try this patch, it will have better chance to figure out
> > the hidden file pages.
> > 
> > 1) apply the patch and recompile kernel with CONFIG_PROC_FILECACHE=m
> > 2) after booting:
> >         modprobe filecache
> >         cp /proc/filecache filecache-`date +'%F'`
> > 3) send us the copied file, it will list all cached files, including
> >    the normally hidden ones.
> 
> The file consists of 674 lines. If I interpret it right, "size" is the 
> filesize and "cached" the amount of the file being in cache (why can 
> this be bigger than the file?!).

          size = file size in bytes
        cached = cached pages

So it's normal that (size > cached).

Thanks,
Fengguang
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