From: Christoph Lameter <clameter@sgi.com>
To: Andrea Arcangeli <andrea@qumranet.com>
Cc: Nick Piggin <npiggin@suse.de>,
steiner@sgi.com, Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-mm@kvack.org, Izik Eidus <izike@qumranet.com>,
Kanoj Sarcar <kanojsarcar@yahoo.com>,
Roland Dreier <rdreier@cisco.com>,
linux-kernel@vger.kernel.org, Avi Kivity <avi@qumranet.com>,
kvm-devel@lists.sourceforge.net, daniel.blueman@quadrics.com,
Robin Holt <holt@sgi.com>,
general@lists.openfabrics.org, Hugh Dickins <hugh@veritas.com>
Subject: [ofa-general] Re: EMM: disable other notifiers before register and unregister
Date: Thu, 3 Apr 2008 12:20:41 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0804031215050.7480@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20080403151908.GB9603@duo.random>
On Thu, 3 Apr 2008, Andrea Arcangeli wrote:
> My attempt to fix this once and for all is to walk all vmas of the
> "mm" inside mmu_notifier_register and take all anon_vma locks and
> i_mmap_locks in virtual address order in a row. It's ok to take those
> inside the mmap_sem. Supposedly if anybody will ever take a double
> lock it'll do in order too. Then I can dump all the other locking and
What about concurrent mmu_notifier registrations from two mm_structs
that have shared mappings? Isnt there a potential deadlock situation?
> faults). So it should be ok to take all those locks inside the
> mmap_sem and implement a lock_vm(mm) unlock_vm(mm). I'll think more
> about this hammer approach while I try to implement it...
Well good luck. Hopefully we will get to something that works.
next prev parent reply other threads:[~2008-04-03 19:20 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-01 20:55 [ofa-general] [patch 0/9] [RFC] EMM Notifier V2 Christoph Lameter
2008-04-01 20:55 ` [patch 1/9] EMM Notifier: The notifier calls Christoph Lameter
2008-04-02 6:49 ` [ofa-general] " Andrea Arcangeli
2008-04-02 10:59 ` Robin Holt
2008-04-02 11:16 ` Andrea Arcangeli
2008-04-02 14:26 ` Robin Holt
2008-04-02 17:59 ` [ofa-general] " Christoph Lameter
2008-04-02 19:03 ` [ofa-general] EMM: Fixup return value handling of emm_notify() Christoph Lameter
2008-04-02 21:25 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:33 ` Christoph Lameter
2008-04-03 10:40 ` Peter Zijlstra
2008-04-03 15:00 ` Andrea Arcangeli
2008-04-03 19:14 ` Christoph Lameter
2008-04-02 21:05 ` [ofa-general] EMM: Require single threadedness for registration Christoph Lameter
2008-04-02 22:01 ` [ofa-general] " Andrea Arcangeli
2008-04-02 22:06 ` Christoph Lameter
2008-04-02 22:17 ` Andrea Arcangeli
2008-04-02 22:41 ` Christoph Lameter
2008-04-03 1:24 ` EMM: disable other notifiers before register and unregister Christoph Lameter
2008-04-03 10:40 ` [ofa-general] " Peter Zijlstra
2008-04-03 15:29 ` Andrea Arcangeli
2008-04-03 19:20 ` Christoph Lameter [this message]
2008-04-03 20:23 ` Christoph Lameter
2008-04-04 12:30 ` Andrea Arcangeli
2008-04-04 20:20 ` [ofa-general] [PATCH] mmu notifier #v11 Andrea Arcangeli
2008-04-04 22:06 ` Christoph Lameter
2008-04-05 0:23 ` [ofa-general] " Andrea Arcangeli
2008-04-07 5:45 ` Christoph Lameter
2008-04-07 6:02 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:53 ` [ofa-general] Re: [patch 1/9] EMM Notifier: The notifier calls Andrea Arcangeli
2008-04-02 21:54 ` Christoph Lameter
2008-04-02 22:09 ` Andrea Arcangeli
2008-04-02 23:04 ` Christoph Lameter
2008-04-01 20:55 ` [ofa-general] [patch 2/9] Move tlb flushing into free_pgtables Christoph Lameter
2008-04-01 20:55 ` [ofa-general] [patch 3/9] Convert i_mmap_lock to i_mmap_sem Christoph Lameter
2008-04-01 20:55 ` [patch 4/9] Remove tlb pointer from the parameters of unmap vmas Christoph Lameter
2008-04-01 20:55 ` [patch 5/9] Convert anon_vma lock to rw_sem and refcount Christoph Lameter
2008-04-02 17:50 ` Andrea Arcangeli
2008-04-02 18:15 ` Christoph Lameter
2008-04-02 21:56 ` [ofa-general] " Andrea Arcangeli
2008-04-02 21:56 ` Christoph Lameter
2008-04-02 22:12 ` Andrea Arcangeli
2008-04-01 20:55 ` [patch 6/9] This patch exports zap_page_range as it is needed by XPMEM Christoph Lameter
2008-04-01 20:55 ` [patch 7/9] Locking rules for taking multiple mmap_sem locks Christoph Lameter
2008-04-01 20:55 ` [patch 8/9] XPMEM: The device driver Christoph Lameter
2008-04-01 20:55 ` [patch 9/9] XPMEM: Simple example Christoph Lameter
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=Pine.LNX.4.64.0804031215050.7480@schroedinger.engr.sgi.com \
--to=clameter@sgi.com \
--cc=a.p.zijlstra@chello.nl \
--cc=andrea@qumranet.com \
--cc=avi@qumranet.com \
--cc=daniel.blueman@quadrics.com \
--cc=general@lists.openfabrics.org \
--cc=holt@sgi.com \
--cc=hugh@veritas.com \
--cc=izike@qumranet.com \
--cc=kanojsarcar@yahoo.com \
--cc=kvm-devel@lists.sourceforge.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=npiggin@suse.de \
--cc=rdreier@cisco.com \
--cc=steiner@sgi.com \
/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