From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta12.messagelabs.com (mail6.bemta12.messagelabs.com [216.82.250.247]) by kanga.kvack.org (Postfix) with ESMTP id 1DA036B002D for ; Fri, 21 Oct 2011 02:54:31 -0400 (EDT) Received: by vcbfk1 with SMTP id fk1so4567557vcb.14 for ; Thu, 20 Oct 2011 23:54:29 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <201110200830.22062.pluto@agmk.net> References: <201110122012.33767.pluto@agmk.net> <201110200830.22062.pluto@agmk.net> Date: Fri, 21 Oct 2011 14:54:29 +0800 Message-ID: Subject: Re: kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110 From: Nai Xia Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: =?ISO-8859-2?Q?Pawe=B3_Sikora?= Cc: Hugh Dickins , Linus Torvalds , Mel Gorman , Andrea Arcangeli , Andrew Morton , linux-mm@kvack.org, jpiszcz@lucidpixels.com, arekm@pld-linux.org, linux-kernel@vger.kernel.org 2011/10/20 Pawe=C5=82 Sikora : > On Wednesday 19 of October 2011 21:42:15 Hugh Dickins wrote: >> On Wed, 19 Oct 2011, Linus Torvalds wrote: >> > On Wed, Oct 19, 2011 at 12:43 AM, Mel Gorman wrote: >> > > >> > > My vote is with the migration change. While there are occasionally >> > > patches to make migration go faster, I don't consider it a hot path. >> > > mremap may be used intensively by JVMs so I'd loathe to hurt it. >> > >> > Ok, everybody seems to like that more, and it removes code rather than >> > adds it, so I certainly prefer it too. Pawel, can you test that other >> > patch (to mm/migrate.c) that Hugh posted? Instead of the mremap vma >> > locking patch that you already verified for your setup? >> > >> > Hugh - that one didn't have a changelog/sign-off, so if you could >> > write that up, and Pawel's testing is successful, I can apply it... >> > Looks like we have acks from both Andrea and Mel. >> >> Yes, I'm glad to have that input from Andrea and Mel, thank you. >> >> Here we go. =C2=A0I can't add a Tested-by since Pawel was reporting on t= he >> alternative patch, but perhaps you'll be able to add that in later. >> >> I may have read too much into Pawel's mail, but it sounded like he >> would have expected an eponymous find_get_pages() lockup by now, >> and was pleased that this patch appeared to have cured that. >> >> I've spent quite a while trying to explain find_get_pages() lockup by >> a missed migration entry, but I just don't see it: I don't expect this >> (or the alternative) patch to do anything to fix that problem. =C2=A0I w= on't >> mind if it magically goes away, but I expect we'll need more info from >> the debug patch I sent Justin a couple of days ago. > > the latest patch (mm/migrate.c) applied on 3.0.4 also survives points > 1) and 2) described previously (https://lkml.org/lkml/2011/10/18/427), > so please apply it to the upstream/stable git tree. > > from the other side, both patches don't help for 3.0.4+vserver host soft-= lock Hi Pawe=C5=82, Did your "both" mean that you applied each patch and run the tests separate= ly, or you applied the both patches and run them together? Maybe there were more than one bugs dancing but having a same effect, not fixing all of them wouldn't help at all. Thanks, Nai Xia > which dies in few hours of stressing. iirc this lock has started with 2.6= .38. > is there any major change in memory managment area in 2.6.38 that i can b= isect > and test with vserver? > > BR, > Pawe=C5=82. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@kvack.org. =C2=A0For 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 > -- 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