From: Hugh Dickins <hughd@google.com>
To: Christoph Lameter <cl@linux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm: fix hang on anon_vma->root->lock
Date: Fri, 27 Aug 2010 14:33:35 -0700 [thread overview]
Message-ID: <AANLkTikML=HghpOVK0WZ0t6CRaNOKvu=57ebojZ+YCNS@mail.gmail.com> (raw)
In-Reply-To: <AANLkTim16oT13keYK_oz=7kmDmdG=ADfkGXMKp3_dEw_@mail.gmail.com>
Sorry, I seem to have hit some key which sent the mail off too soon, a
tab perhaps: finishing up...
On Fri, Aug 27, 2010 at 2:28 PM, Hugh Dickins <hughd@google.com> wrote:
> On Fri, Aug 27, 2010 at 1:56 PM, Christoph Lameter <cl@linux.com> wrote:
>>
>>> of that second check, then we know that we got the right anon_vma,
>>
>> I do not see a second check (*after* taking the lock) in the patch
if (page_mapped(page))
return anon_vma;
>> and the way the lock is taken can be a problem in itself.
No, that's what we rely upon SLAB_DESTROY_BY_RCU for.
Hugh
--
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/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-08-27 21:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-26 6:12 Hugh Dickins
2010-08-26 6:41 ` David Miller
2010-08-26 10:54 ` Hugh Dickins
2010-08-26 19:00 ` David Miller
2010-08-27 0:19 ` Andrea Arcangeli
2010-08-26 13:32 ` Rik van Riel
2010-08-26 23:50 ` Andrea Arcangeli
2010-08-27 1:43 ` Hugh Dickins
2010-08-27 9:55 ` Andrea Arcangeli
2010-08-27 16:43 ` Hugh Dickins
2010-08-27 17:13 ` Christoph Lameter
2010-08-27 17:55 ` Hugh Dickins
2010-08-27 19:29 ` Christoph Lameter
2010-08-27 20:14 ` Hugh Dickins
2010-08-27 20:56 ` Christoph Lameter
2010-08-27 21:28 ` Hugh Dickins
2010-08-27 21:33 ` Hugh Dickins [this message]
2010-08-27 23:06 ` Christoph Lameter
2010-08-28 1:07 ` Hugh Dickins
2010-08-28 2:47 ` Christoph Lameter
2010-08-28 10:17 ` Peter Zijlstra
2010-08-28 15:54 ` Andrea Arcangeli
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='AANLkTikML=HghpOVK0WZ0t6CRaNOKvu=57ebojZ+YCNS@mail.gmail.com' \
--to=hughd@google.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=cl@linux.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=peterz@infradead.org \
--cc=riel@redhat.com \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox