From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx186.postini.com [74.125.245.186]) by kanga.kvack.org (Postfix) with SMTP id F41BD6B0005 for ; Mon, 11 Mar 2013 08:40:50 -0400 (EDT) Message-ID: <513DD0BD.8000400@symas.com> Date: Mon, 11 Mar 2013 05:40:29 -0700 From: Howard Chu MIME-Version: 1.0 Subject: Re: mmap vs fs cache References: <5136320E.8030109@symas.com> <20130307154312.GG6723@quack.suse.cz> <20130308020854.GC23767@cmpxchg.org> <5139975F.9070509@symas.com> <20130308084246.GA4411@shutemov.name> <5139B214.3040303@symas.com> <5139FA13.8090305@genband.com> <5139FD27.1030208@symas.com> <20130308161643.GE23767@cmpxchg.org> <513A445E.9070806@symas.com> <20130311120427.GC29799@quack.suse.cz> In-Reply-To: <20130311120427.GC29799@quack.suse.cz> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Jan Kara Cc: Johannes Weiner , Chris Friesen , "Kirill A. Shutemov" , Mel Gorman , Rik van Riel , linux-kernel , linux-mm@kvack.org Jan Kara wrote: > On Fri 08-03-13 12:04:46, Howard Chu wrote: >> The test clearly is accessing only 30GB of data. Once slapd reaches >> this process size, the test can be stopped and restarted any number >> of times, run for any number of hours continuously, and memory use >> on the system is unchanged, and no pageins occur. > Interesting. It might be worth trying what happens if you do > madvise(..., MADV_DONTNEED) on the data file instead of dropping caches > with /proc/sys/vm/drop_caches. That way we can establish whether the extra > cached data is in the data file (things will look the same way as with > drop_caches) or somewhere else (there will be still unmapped page cache). I screwed up. My madvise(RANDOM) call used the wrong address/len so it didn't cover the whole region. After fixing this, the test now runs as expected - the slapd process size grows to 30GB without any problem. Sorry for the noise. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/ -- 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