From: Michel Lespinasse <walken@google.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux.com>,
akpm@linux-foundation.org, npiggin@kernel.dk,
Pekka Enberg <penberg@cs.helsinki.fi>,
David Rientjes <rientjes@google.com>,
linux-mm@kvack.org, Andi Kleen <andi@firstfloor.org>
Subject: Re: shrinkers: Add node to indicate where to target shrinking
Date: Sun, 14 Nov 2010 03:05:36 -0800 [thread overview]
Message-ID: <AANLkTi=xPYe6KVVNM7y+tnDAWcVOMb_6jKo5Hq8QNSC8@mail.gmail.com> (raw)
In-Reply-To: <20101114161059.BED5.A69D9226@jp.fujitsu.com>
On Sat, Nov 13, 2010 at 11:10 PM, KOSAKI Motohiro
<kosaki.motohiro@jp.fujitsu.com> wrote:
>> On Thu, Oct 21, 2010 at 11:00 AM, Christoph Lameter <cl@linux.com> wrote:
>> > @@ -218,6 +218,7 @@ unsigned long shrink_slab(unsigned long
>> > unsigned long total_scan;
>> > unsigned long max_pass;
>> >
>> > + shrinker->node = node;
>> > max_pass = (*shrinker->shrink)(shrinker, 0, gfp_mask);
>> > delta = (4 * scanned) / shrinker->seeks;
>> > delta *= max_pass;
>>
>> Apologies for coming late to the party, but I have to ask - is there
>> anything protecting shrinker->node from concurrent modification if
>> several threads are trying to reclaim memory at once ?
>
> shrinker_rwsem? :)
Doesn't work - it protects shrink_slab() from concurrent modifications
of the shrinker_list in register_shrinker() or unregister_shrinker(),
but several shirnk_slab() calls can still execute in parallel since
they only grab shrinker_rwsem in shared (read) mode.
--
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
--
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next prev parent reply other threads:[~2010-11-14 11:05 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-21 17:59 vmscan: Do not run shrinkers for zones other than ZONE_NORMAL Christoph Lameter
2010-10-21 18:00 ` shrinkers: Add node to indicate where to target shrinking Christoph Lameter
2010-10-21 18:12 ` Andi Kleen
2010-10-21 20:57 ` David Rientjes
2010-10-21 21:07 ` Christoph Lameter
2010-10-22 13:27 ` Andi Kleen
2010-10-21 23:58 ` Nick Piggin
2010-10-22 12:12 ` Andi Kleen
2010-10-22 15:55 ` Christoph Hellwig
2010-10-22 16:32 ` Christoph Lameter
2010-10-24 1:42 ` Nick Piggin
2010-10-25 0:57 ` KOSAKI Motohiro
2010-10-25 14:59 ` Christoph Lameter
2010-11-09 4:03 ` Nick Piggin
2010-10-22 16:46 ` Andi Kleen
2010-10-24 1:31 ` Nick Piggin
2010-11-14 2:26 ` Michel Lespinasse
2010-11-14 7:10 ` KOSAKI Motohiro
2010-11-14 11:05 ` Michel Lespinasse [this message]
2010-11-15 0:29 ` KOSAKI Motohiro
2010-10-21 18:13 ` vmscan: Do not run shrinkers for zones other than ZONE_NORMAL Andi Kleen
2010-10-21 18:22 ` Christoph Lameter
2010-10-21 18:27 ` Christoph Lameter
2010-10-21 18:33 ` Andi Kleen
2010-10-21 20:48 ` David Rientjes
2010-10-21 20:54 ` Christoph Lameter
2010-10-21 19:40 ` Andrew Morton
2010-10-21 20:03 ` Christoph Lameter
2010-10-21 20:14 ` Andrew Morton
2010-10-21 20:28 ` Christoph Lameter
2010-10-21 20:36 ` Andrew Morton
2010-10-21 20:49 ` Christoph Lameter
2010-10-21 20:59 ` Andrew Morton
2010-10-21 21:13 ` Christoph Lameter
2010-10-21 21:21 ` Andrew Morton
2010-10-21 23:04 ` Christoph Lameter
2010-10-21 23:56 ` Nick Piggin
2010-10-22 1:37 ` KOSAKI Motohiro
2010-10-22 14:06 ` Christoph Lameter
2010-10-24 1:37 ` Nick Piggin
2010-10-25 1:22 ` KOSAKI Motohiro
2010-10-25 15:07 ` Christoph Lameter
2010-10-26 2:52 ` KOSAKI Motohiro
2010-10-26 12:42 ` KOSAKI Motohiro
2010-10-26 13:10 ` Christoph Lameter
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