From: Christoph Lameter <clameter@sgi.com>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <andrea@suse.de>, Rik van Riel <riel@redhat.com>,
linux-mm@kvack.org
Subject: Re: [patch 4/9] oom: add per-zone locking
Date: Thu, 20 Sep 2007 15:26:36 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0709201522110.11627@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <alpine.DEB.0.9999.0709201508270.732@chino.kir.corp.google.com>
On Thu, 20 Sep 2007, David Rientjes wrote:
> It doesn't matter. You would then need the following in __alloc_pages():
>
> if (!try_set_zone_oom(zonelist)) {
> clear_zonelist_oom(zonelist);
> schedule_timeout_uninterruptible(1);
> goto restart;
> }
>
> or a call to clear_zonelist_oom() before returning 0 in
> try_set_zone_oom().
Yup.
> But that races with another thread that is also trying an allocation
> attempt and you end up clearing the ZONE_OOM_LOCKED bits that it has
> already set in its call to try_set_zone_oom().
Well if you remember how far you got with locking and just undo those
then you are fine.
The global lock there just spooks me. If a large number of processors get
in there (say 1000 or so in the case of a global oom) then there is
already an issue of getting the lock from node 0. The bits in the zone
are distributed over all of the nodes in the system.
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next prev parent reply other threads:[~2007-09-20 22:26 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-20 20:23 [patch 0/9] oom killer serialization David Rientjes
2007-09-20 20:23 ` [patch 1/9] oom: move prototypes to appropriate header file David Rientjes
2007-09-20 20:23 ` [patch 2/9] oom: move constraints to enum David Rientjes
2007-09-20 20:23 ` [patch 3/9] oom: change all_unreclaimable zone member to flags David Rientjes
2007-09-20 20:23 ` [patch 4/9] oom: add per-zone locking David Rientjes
2007-09-20 20:23 ` [patch 5/9] oom: serialize out of memory calls David Rientjes
2007-09-20 20:23 ` [patch 6/9] oom: add oom_kill_asking_task sysctl David Rientjes
2007-09-20 20:23 ` [patch 7/9] oom: suppress extraneous stack and memory dump David Rientjes
2007-09-20 20:23 ` [patch 8/9] oom: compare cpuset mems_allowed instead of exclusive ancestors David Rientjes
2007-09-20 20:23 ` [patch 9/9] oom: do not take callback_mutex David Rientjes
2007-09-20 22:04 ` Christoph Lameter
2007-09-20 22:01 ` [patch 8/9] oom: compare cpuset mems_allowed instead of exclusive ancestors Christoph Lameter
2007-09-20 22:00 ` [patch 7/9] oom: suppress extraneous stack and memory dump Christoph Lameter
2007-09-20 22:03 ` [patch 6/9] oom: add oom_kill_asking_task sysctl Christoph Lameter
2007-09-20 22:07 ` David Rientjes
2007-09-20 22:09 ` Christoph Lameter
2007-09-21 9:05 ` Andrew Morton
2007-09-20 21:59 ` [patch 5/9] oom: serialize out of memory calls Christoph Lameter
2007-09-21 9:01 ` Andrew Morton
2007-09-21 20:04 ` David Rientjes
2007-09-20 21:59 ` [patch 4/9] oom: add per-zone locking Christoph Lameter
2007-09-20 22:03 ` David Rientjes
2007-09-20 22:05 ` Christoph Lameter
2007-09-20 22:12 ` David Rientjes
2007-09-20 22:26 ` Christoph Lameter [this message]
2007-09-20 22:48 ` David Rientjes
2007-09-21 8:59 ` Andrew Morton
2007-09-20 21:56 ` [patch 3/9] oom: change all_unreclaimable zone member to flags Christoph Lameter
2007-09-20 21:58 ` David Rientjes
2007-09-21 8:55 ` Andrew Morton
2007-09-21 9:12 ` [patch 0/9] oom killer serialization Andrew Morton
2007-09-21 9:21 ` David Rientjes
2007-09-21 19:13 ` David Rientjes
2007-09-21 19:15 ` Christoph Lameter
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