linux-kernel - Re: drop

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Message-Id: <200903051505.26584.M4rkusXXL@web.de>
Date:	Thu, 5 Mar 2009 15:05:26 +0100
From:	Markus <M4rkusXXL@....de>
To:	linux-kernel@...r.kernel.org
Cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Zdenek Kabelac <zkabelac@...hat.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Lukas Hejtmanek <xhejtman@....muni.cz>
Subject: Re: drop_caches ...

> Could you please try the attached patch which will also show the
> user and process that opened these files? It adds three more fields
> when CONFIG_PROC_FILECACHE_EXTRAS is selected.
> 
> Thanks,
> Fengguang
>  
> On Thu, Mar 05, 2009 at 01:55:35PM +0200, Markus wrote:
> > 
> > # sort -n -k 3 filecache-2009-03-05 | tail -n 5
> >      15886       7112     7112     100      1    d- 00:08
> > (tmpfs)        /dev/zero\040(deleted)
> >      16209      35708    35708     100      1    d- 00:08
> > (tmpfs)        /dev/zero\040(deleted)
> >      16212      82128    82128     100      1    d- 00:08
> > (tmpfs)        /dev/zero\040(deleted)
> >      15887     340024   340024     100      1    d- 00:08
> > (tmpfs)        /dev/zero\040(deleted)
> >      15884     455008   455008     100      1    d- 00:08
> > (tmpfs)        /dev/zero\040(deleted)
> > 
> > The sum of the third column is 1013 MB.
> > To note the biggest ones (or do you want the whole file?)... and 
thats 
> > after a sync and a drop_caches! (Can be seen in the commands given.)

I could, but I know where these things belong to. Its from sphinx (a 
mysql indexer) searchd. It loads parts of the index into memory.
The sizes looked well-known and killing the searchd will reduce "cached" 
to a normal amount ;)

I just dont know why its in "cached" (can that be swapped out btw?).
But I think thats not a problem of the kernel, but of anonymous 
mmap-ing.

I think its resolved, thanks to everybody and Fengguang in particular!

Markus
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