From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id F21CE6B00CF for ; Thu, 5 Mar 2009 09:24:30 -0500 (EST) Date: Thu, 5 Mar 2009 22:22:30 +0800 From: Wu Fengguang Subject: Re: drop_caches ... Message-ID: <20090305142230.GA23465@localhost> References: <200903041057.34072.M4rkusXXL@web.de> <200903051255.35407.M4rkusXXL@web.de> <20090305132906.GA22524@localhost> <200903051505.26584.M4rkusXXL@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200903051505.26584.M4rkusXXL@web.de> Sender: owner-linux-mm@kvack.org To: Markus Cc: "linux-kernel@vger.kernel.org" , Zdenek Kabelac , "linux-mm@kvack.org" , Lukas Hejtmanek List-ID: Hi Markus, On Thu, Mar 05, 2009 at 04:05:26PM +0200, Markus wrote: > > 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 ;) And it's weird about the file name: /dev/zero. I wonder how it managed to create that file, and then delete it, inside a tmpfs! Just out of curiosity, are they shm objects? Can you show us the output of 'df'? In your convenient time. > 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. You know, because the file is created in tmpfs, which is swap-backed. By definition the pages here cannot be dropped by third-party. > I think its resolved, thanks to everybody and Fengguang in particular! You are welcome :-) Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org