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 40BDE8D0039 for ; Thu, 24 Feb 2011 09:04:57 -0500 (EST) Date: Thu, 24 Feb 2011 15:04:14 +0100 From: Andrea Arcangeli Subject: Re: too big min_free_kbytes Message-ID: <20110224140413.GA5633@random.random> References: <20110126163655.GU18984@csn.ul.ie> <20110126174236.GV18984@csn.ul.ie> <20110127134057.GA32039@csn.ul.ie> <20110127152755.GB30919@random.random> <20110203025808.GJ5843@random.random> <20110214022524.GA18198@sli10-conroe.sh.intel.com> <20110222142559.GD15652@csn.ul.ie> <1298438954.19589.7.camel@sli10-conroe> <20110223144509.GG31195@random.random> <1298534927.19589.41.camel@sli10-conroe> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1298534927.19589.41.camel@sli10-conroe> Sender: owner-linux-mm@kvack.org List-ID: To: Shaohua Li Cc: Mel Gorman , Andrew Morton , linux-mm , "Chen, Tim C" , Rik van Riel , "Shi, Alex" , Andi Kleen On Thu, Feb 24, 2011 at 04:08:47PM +0800, Shaohua Li wrote: > with madvise, the min_free_kbytes is still high (same as the 'always' > case). The result is still we have about 50M memory is reserved. you can > try at your machine with boot option 'mem=2G' and check the zoneinfo > output. yes I know. The objective of that test was exactly to know if the problem is higher memory footprint because of THP or only the anti-frag/min_free_kbytes which would still be present with the "madvise" setting (anti-frag is only shutdown by the "never" setting). If you still have the out of memory with madvise, then you can keep THP enabled "always" and then "echo 16384 > /proc/sys/vm/min_free_kbytes", it should work fine then even with THP always mode then, no need to disable THP (simply you won't have a good guarantee that anti-frag is functional so the hugepage usage will be reduced over time compared to the default min_free_kbytes that enables anti-frag fully). -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org