Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756077AbZFWVZ2 (ORCPT ); Tue, 23 Jun 2009 17:25:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754527AbZFWVZQ (ORCPT ); Tue, 23 Jun 2009 17:25:16 -0400 Received: from mx2.redhat.com ([66.187.237.31]:40737 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753521AbZFWVZP (ORCPT ); Tue, 23 Jun 2009 17:25:15 -0400 Message-ID: <4A41481D.1060607@redhat.com> Date: Tue, 23 Jun 2009 17:24:45 -0400 From: Rik van Riel Organization: Red Hat, Inc User-Agent: Thunderbird 2.0.0.17 (X11/20080915) MIME-Version: 1.0 To: akataria@vmware.com CC: KAMEZAWA Hiroyuki , KOSAKI Motohiro , LKML , Lee Schermerhorn , Dave Hansen , Mel Gorman , "linux-mm@kvack.org" Subject: Re: [PATCH] Hugepages should be accounted as unevictable pages. References: <20090623093459.2204.A69D9226@jp.fujitsu.com> <1245732411.18339.6.camel@alok-dev1> <20090623135017.220D.A69D9226@jp.fujitsu.com> <20090623141147.8f2cef18.kamezawa.hiroyu@jp.fujitsu.com> <1245736441.18339.21.camel@alok-dev1> In-Reply-To: <1245736441.18339.21.camel@alok-dev1> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1171 Lines: 30 Alok Kataria wrote: > Both, while working on an module I noticed that there is no way direct > way to get any information regarding the total number of unrecliamable > (unevictable) pages in the system. While reading through the kernel > sources i came across this unevictalbe LRU framework and thought that > this should actually work towards providing total unevictalbe pages in > the system irrespective of where they reside. The unevictable count tells you how many _userspace_ pages are not evictable. There are countless accounted and unaccounted kernel allocations that show up (or not) in other fields in /proc/meminfo. I can see something reasonable on both sides of this particular debate. However, even with this patch the "unevictable" statistic does not reclaim the total number of pages that are unevictable pages from a zone, so I am not sure how it helps you achieve your goal. -- All rights reversed. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/