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 15:05:43 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0709201504320.11226@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <alpine.DEB.0.9999.0709201500250.32266@chino.kir.corp.google.com>
On Thu, 20 Sep 2007, David Rientjes wrote:
> On Thu, 20 Sep 2007, Christoph Lameter wrote:
>
> > > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > > --- a/mm/oom_kill.c
> > > +++ b/mm/oom_kill.c
> > > @@ -27,6 +27,7 @@
> > > #include <linux/notifier.h>
> > >
> > > int sysctl_panic_on_oom;
> > > +static DEFINE_MUTEX(zone_scan_mutex);
> > > /* #define DEBUG */
> >
> > Use testset/testclear bitops instead of adding a lock?
> >
>
> That doesn't work nicely, unfortunately, because then we need to unlock
> all zones that we've locked so far in try_set_zone_oom() if we find one
> that is alredy ZONE_OOM_LOCKED during the scan of the zonelist.
You need that lock release function anyways to when the oom killing is
done.
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next prev parent reply other threads:[~2007-09-20 22:05 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 [this message]
2007-09-20 22:12 ` David Rientjes
2007-09-20 22:26 ` Christoph Lameter
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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