From: Andrea Arcangeli <aarcange@redhat.com>
To: Nai Xia <nai.xia@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
Pawel Sikora <pluto@agmk.net>,
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: Mon, 31 Oct 2011 17:34:22 +0100 [thread overview]
Message-ID: <20111031163422.GC3466@redhat.com> (raw)
In-Reply-To: <201110221307.11615.nai.xia@gmail.com>
Hi Nai,
On Sat, Oct 22, 2011 at 01:07:11PM +0800, Nai Xia wrote:
> Yeah, anon_vma root lock is a big lock. And JFYI, actually I am doing
> some very nasty hacking on anon_vma and one of the side effects is
> breaking the root lock into pieces. But this area is pretty
> convolved by many racing conditions. I hope some day I will finally make
> my patch work and have your precious review of it. :-)
:) It's going to be not trivial, initially it was not a shared lock
but it wasn't safe that way (especially with migrate required a
reliable rmap_walk) and using a shared lock across all
same_anon_vma/same_vma lists was the only way to be safe and solve the
races.
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next prev parent reply other threads:[~2011-10-31 17:54 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
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 [this message]
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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