From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Izik Eidus <ieidus@redhat.com>, Rik van Riel <riel@redhat.com>,
Chris Wright <chrisw@redhat.com>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Andrew Morton <akpm@linux-foundation.org>,
"Justin M. Forbes" <jmforbes@linuxtx.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 13/12] ksm: fix munlock during exit_mmap deadlock
Date: Wed, 26 Aug 2009 21:29:07 +0100 (BST) [thread overview]
Message-ID: <Pine.LNX.4.64.0908262118470.4364@sister.anvils> (raw)
In-Reply-To: <20090826194444.GB14722@random.random>
On Wed, 26 Aug 2009, Andrea Arcangeli wrote:
> On Wed, Aug 26, 2009 at 08:17:50PM +0100, Hugh Dickins wrote:
> > Has anyone looked at why Rawhide's mlockall is not faulting in the
> > pages, I wonder if there's a separate bug there?)
>
> I reproduced only with self compiled mmotm kernel with full self
> compiled userland with just a mlockall and exit (not rawhide
> kernel/userland) so there's certainly no bug in rawhide, or at least
> nothing special about it.
I just tried again and got it myself: the faulting page is a PROT_NONE
page of libc, yes, that figures: mlocking would not fault it in, but
munlocking would (in its current implementation) insist on faulting it.
I don't know what my difficulty was yesterday: perhaps that page
isn't always PROT_NONE, perhaps I got confused and was testing the
wrong kernel, one without KSM or one with my follow_page munlock.
Hugh
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next prev parent reply other threads:[~2009-08-26 20:29 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-03 12:08 [PATCH 0/12] ksm: stats, oom, doc, misc Hugh Dickins
2009-08-03 12:10 ` [PATCH 1/12] ksm: rename kernel_pages_allocated Hugh Dickins
2009-08-03 14:21 ` Izik Eidus
2009-08-03 16:48 ` Andrea Arcangeli
2009-08-03 12:11 ` [PATCH 2/12] ksm: move pages_sharing updates Hugh Dickins
2009-08-03 14:34 ` Izik Eidus
2009-08-03 16:53 ` Andrea Arcangeli
2009-08-03 17:34 ` Hugh Dickins
2009-08-03 12:11 ` [PATCH 3/12] ksm: pages_unshared and pages_volatile Hugh Dickins
2009-08-03 14:54 ` Izik Eidus
2009-08-04 21:49 ` Andrew Morton
2009-08-05 11:39 ` Hugh Dickins
2009-08-05 15:11 ` Andrea Arcangeli
2009-08-03 12:12 ` [PATCH 4/12] ksm: break cow once unshared Hugh Dickins
2009-08-03 16:00 ` Izik Eidus
2009-08-03 12:14 ` [PATCH 5/12] ksm: keep quiet while list empty Hugh Dickins
2009-08-03 16:55 ` Izik Eidus
2009-08-04 21:59 ` Andrew Morton
2009-08-05 11:54 ` Hugh Dickins
2009-08-03 12:15 ` [PATCH 6/12] ksm: five little cleanups Hugh Dickins
2009-08-04 12:41 ` Izik Eidus
2009-08-03 12:16 ` [PATCH 7/12] ksm: fix endless loop on oom Hugh Dickins
2009-08-04 12:55 ` Izik Eidus
2009-08-03 12:17 ` [PATCH 8/12] ksm: distribute remove_mm_from_lists Hugh Dickins
2009-08-04 13:03 ` Izik Eidus
2009-08-03 12:18 ` [PATCH 9/12] ksm: fix oom deadlock Hugh Dickins
2009-08-04 19:32 ` Izik Eidus
2009-08-25 14:58 ` Andrea Arcangeli
2009-08-25 15:22 ` [PATCH 13/12] ksm: fix munlock during exit_mmap deadlock Andrea Arcangeli
2009-08-25 17:49 ` Hugh Dickins
2009-08-25 18:10 ` Andrea Arcangeli
2009-08-25 18:58 ` Hugh Dickins
2009-08-25 19:45 ` Andrea Arcangeli
2009-08-26 16:18 ` Justin M. Forbes
2009-08-26 19:17 ` Hugh Dickins
2009-08-26 19:44 ` Andrea Arcangeli
2009-08-26 19:57 ` Hugh Dickins
2009-08-26 20:28 ` Andrea Arcangeli
2009-08-26 20:54 ` Izik Eidus
2009-08-26 21:14 ` Andrea Arcangeli
2009-08-26 21:49 ` Izik Eidus
2009-08-27 19:11 ` Hugh Dickins
2009-08-27 19:35 ` Izik Eidus
2009-08-26 22:00 ` David Rientjes
2009-08-26 20:29 ` Hugh Dickins [this message]
2009-08-25 17:35 ` [PATCH 9/12] ksm: fix oom deadlock Hugh Dickins
2009-08-25 17:47 ` Andrea Arcangeli
2009-08-03 12:19 ` [PATCH 10/12] ksm: sysfs and defaults Hugh Dickins
2009-08-04 19:34 ` Izik Eidus
2009-08-03 12:21 ` [PATCH 11/12] ksm: add some documentation Hugh Dickins
2009-08-04 19:35 ` Izik Eidus
2009-08-03 12:22 ` [PATCH 12/12] ksm: remove VM_MERGEABLE_FLAGS Hugh Dickins
2009-08-04 19:35 ` Izik Eidus
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