From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx184.postini.com [74.125.245.184]) by kanga.kvack.org (Postfix) with SMTP id CE3856B004F for ; Tue, 27 Dec 2011 08:33:06 -0500 (EST) Received: by wgbds13 with SMTP id ds13so17405702wgb.26 for ; Tue, 27 Dec 2011 05:33:05 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20111227092052.f2b02637.kamezawa.hiroyu@jp.fujitsu.com> References: <1324437036.4677.5.camel@hakkenden.homenet> <20111221095249.GA28474@tiehlicka.suse.cz> <20111221225512.GG23662@dastard> <1324630880.562.6.camel@rybalov.eng.ttk.net> <20111223102027.GB12731@dastard> <1324638242.562.15.camel@rybalov.eng.ttk.net> <20111223204503.GC12731@dastard> <1324808519.29243.8.camel@hakkenden.homenet> <20111227092052.f2b02637.kamezawa.hiroyu@jp.fujitsu.com> Date: Tue, 27 Dec 2011 21:33:04 +0800 Message-ID: Subject: Re: Kswapd in 3.2.0-rc5 is a CPU hog From: Hillf Danton Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: KAMEZAWA Hiroyuki Cc: "Nikolay S." , Dave Chinner , Michal Hocko , linux-kernel@vger.kernel.org, linux-mm@kvack.org On Tue, Dec 27, 2011 at 8:20 AM, KAMEZAWA Hiroyuki wrote: > On Mon, 26 Dec 2011 20:35:46 +0800 > Hillf Danton wrote: > >> On Sun, Dec 25, 2011 at 6:21 PM, Nikolay S. wrote: >> > >> > Uhm.., is this patch against 3.2-rc4? I can not apply it. There's no >> > mem_cgroup_lru_del_list(), but void mem_cgroup_del_lru_list(). Should I >> > place changes there? >> > >> > And also, -rc7 is here. May the problem be addressed as part of some >> > ongoing work? Is there any reason to try -rc7 (the problem requires >> > several days of uptime to become obvious)? >> > >> >> Sorry, Nikolay, it is not based on the -next, nor on the -rc5(I assumed it was). >> The following is based on -next, and if you want to test -rc5, please >> grep MEM_CGROUP_ZSTAT mm/memcontrol.c and change it. >> >> Best regard >> > > Hmm ? memcg is used ? Why do you consider this will be a help ? > Hi Kame Please see the livelock at https://lkml.org/lkml/2011/12/23/222 and if it is related to the hog here, please check if the following is in right direction. Thanks Hillf --- --- a/mm/memcontrol.c Mon Dec 26 20:34:38 2011 +++ b/mm/memcontrol.c Tue Dec 27 20:05:12 2011 @@ -3637,6 +3637,7 @@ static int mem_cgroup_force_empty_list(s list = &mz->lruvec.lists[lru]; loop = MEM_CGROUP_ZSTAT(mz, lru); + WARN_ON((long)loop < 0); /* give some margin against EBUSY etc...*/ loop += 256; busy = NULL; -- 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