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 22A2B6B005A for ; Thu, 9 Jul 2009 06:12:08 -0400 (EDT) Received: by gxk3 with SMTP id 3so78944gxk.14 for ; Thu, 09 Jul 2009 03:27:53 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20090709161712.23B0.A69D9226@jp.fujitsu.com> References: <20090709144938.23A8.A69D9226@jp.fujitsu.com> <20090709161712.23B0.A69D9226@jp.fujitsu.com> Date: Thu, 9 Jul 2009 19:27:52 +0900 Message-ID: <28c262360907090327w63b0cdfdn5bc2ad628239e53b@mail.gmail.com> Subject: Re: [PATCH 5/5] add NR_ANON_PAGES to OOM log From: Minchan Kim Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: Christoph Lameter , Wu Fengguang , LKML , linux-mm , Andrew Morton , David Rientjes , Rik van Riel List-ID: On Thu, Jul 9, 2009 at 4:20 PM, KOSAKI Motohiro wrote: >> > On Mon, 6 Jul 2009, Minchan Kim wrote: >> > >> > > Anyway, I think it's not a big cost in normal system. >> > > So If you want to add new accounting, I don't have any objection. :) >> > >> > Lets keep the counters to a mininum. If we can calculate the values from >> > something else then there is no justification for a new counter. >> > >> > A new counter increases the size of the per cpu structures that exist for >> > each zone and each cpu. 1 byte gets multiplies by the number of cpus and >> > that gets multiplied by the number of zones. >> >> OK. I'll implement this idea. > > Grr, sorry I cancel this opinion. Shem pages can't be calculated > by minchan's formula. > > if those page are mlocked, the page move to unevictable lru. then > this calculation don't account mlocked page. However mlocked tmpfs pages > also make OOM issue. Absolutely. You're right. But In my opinion, mlocked shmem pages are important ? Now we care only number of unevictable pages but don't care what kinds of pages there are in unevictable list. What we need is to decode OOM more easily. I think what kinds of pages there area unevictable lur list is not important. -- Kind regards, Minchan Kim -- 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