From: Pawel Sikora <pluto@agmk.net>
To: Nai Xia <nai.xia@gmail.com>
Cc: Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
Andrea Arcangeli <aarcange@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, jpiszcz@lucidpixels.com, arekm@pld-linux.org,
linux-kernel@vger.kernel.org
Subject: Re: kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110
Date: Fri, 21 Oct 2011 09:35:46 +0200 [thread overview]
Message-ID: <2082417.IAMpsykX5y@pawels> (raw)
In-Reply-To: <CAPQyPG5c1ADteP_rA2JRqLz88s7ZP_vWAKV-dp2hCSM9bRCpmg@mail.gmail.com>
On Friday 21 of October 2011 14:54:29 Nai Xia wrote:
> 2011/10/20 Paweł Sikora <pluto@agmk.net>:
> > 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 <mgorman@suse.de> 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. I can't add a Tested-by since Pawel was reporting on the
> >> 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. I won'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 Paweł,
>
> Did your "both" mean that you applied each patch and run the tests separately,
yes, i've tested Hugh's patches separately.
> Maybe there were more than one bugs dancing but having a same effect,
> not fixing all of them wouldn't help at all.
i suppose that vserver patch only exposes some tricky bug introduced in 2.6.38.
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next prev parent reply other threads:[~2011-10-21 7:36 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <201110122012.33767.pluto@agmk.net>
[not found] ` <alpine.LSU.2.00.1110131547550.1346@sister.anvils>
2011-10-13 23:30 ` kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110 Hugh Dickins
2011-10-16 16:11 ` Christoph Hellwig
2011-10-16 23:54 ` Andrea Arcangeli
2011-10-17 18:51 ` Hugh Dickins
2011-10-17 22:05 ` Andrea Arcangeli
2011-10-19 7:43 ` Mel Gorman
2011-10-19 13:39 ` Linus Torvalds
2011-10-19 19:42 ` Hugh Dickins
2011-10-20 6:30 ` Paweł Sikora
2011-10-20 6:51 ` Linus Torvalds
2011-10-21 6:54 ` Nai Xia
2011-10-21 7:35 ` Pawel Sikora [this message]
2011-10-20 12:51 ` Nai Xia
2011-10-20 18:36 ` Hugh Dickins
2011-10-21 6:22 ` Nai Xia
2011-10-21 8:07 ` Pawel Sikora
2011-10-21 9:07 ` Nai Xia
2011-10-21 21:36 ` Paweł Sikora
2011-10-22 6:21 ` Nai Xia
2011-10-22 16:42 ` Paweł Sikora
2011-10-20 9:11 ` Nai Xia
2011-10-21 15:56 ` Mel Gorman
2011-10-21 17:21 ` Nai Xia
2011-10-21 17:41 ` Andrea Arcangeli
2011-10-21 22:50 ` Andrea Arcangeli
2011-10-22 5:52 ` Nai Xia
2011-10-31 17:14 ` Andrea Arcangeli
2011-10-31 17:27 ` [PATCH] mremap: enforce rmap src/dst vma ordering in case of vma_merge succeeding in copy_vma Andrea Arcangeli
2011-11-01 12:07 ` Mel Gorman
2011-11-01 14:35 ` Nai Xia
2011-11-04 7:31 ` Hugh Dickins
2011-11-04 14:34 ` Nai Xia
2011-11-04 15:59 ` Pawel Sikora
2011-11-05 2:21 ` Nai Xia
2011-11-04 19:16 ` Hugh Dickins
2011-11-04 20:54 ` Andrea Arcangeli
2011-11-05 0:09 ` Nai Xia
2011-11-05 2:21 ` Hugh Dickins
2011-11-05 3:07 ` Andrea Arcangeli
2011-11-05 17:06 ` Andrea Arcangeli
2011-12-08 3:24 ` David Rientjes
2011-12-08 12:42 ` Andrea Arcangeli
2011-12-09 0:08 ` Andrew Morton
2011-12-09 1:55 ` Andrea Arcangeli
2011-11-04 23:56 ` Andrea Arcangeli
2011-11-05 0:21 ` Nai Xia
2011-11-05 0:59 ` Nai Xia
2011-11-05 1:33 ` Andrea Arcangeli
2011-11-05 2:00 ` Nai Xia
2011-11-07 13:14 ` Mel Gorman
2011-11-07 15:42 ` Andrea Arcangeli
2011-11-07 16:28 ` Mel Gorman
2011-11-09 1:25 ` Andrea Arcangeli
2011-11-11 9:14 ` Nai Xia
2011-11-16 14:00 ` Andrea Arcangeli
2011-11-17 0:16 ` Hugh Dickins
2011-11-17 2:49 ` Nai Xia
2011-11-17 6:21 ` Nai Xia
2011-11-17 18:42 ` Andrea Arcangeli
2011-11-18 1:42 ` Nai Xia
2011-11-18 2:17 ` Andrea Arcangeli
2011-11-19 9:15 ` Nai Xia
2011-10-22 5:07 ` kernel 3.0: BUG: soft lockup: find_get_pages+0x51/0x110 Nai Xia
2011-10-31 16:34 ` Andrea Arcangeli
2011-10-16 22:37 ` Linus Torvalds
2011-10-17 3:02 ` Hugh Dickins
2011-10-17 3:09 ` Linus Torvalds
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