From: Christoph Lameter <cl@linux.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Nick Piggin <npiggin@kernel.dk>,
akpm@linux-foundation.org, 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: Fri, 22 Oct 2010 11:32:37 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1010221121550.22051@router.home> (raw)
In-Reply-To: <20101022155513.GA26790@infradead.org>
On Fri, 22 Oct 2010, Christoph Hellwig wrote:
>
> I think making shrinking decision per-zone is fine. But do we need to
> duplicate all the lru lists and infrastructure per-zone for that instead
> of simply per-zone? Even with per-node lists we can easily skip over
> items from the wrong zone.
>
> Given that we have up to 6 zones per node currently, and we would mostly
> use one with a few fallbacks that seems like a lot of overkill.
Zones can also cause asymmetry in reclaim if per zone reclaim is done.
Look at the following zone setup of a Dell R910:
grep "^Node" /proc/zoneinfo
Node 0, zone DMA
Node 0, zone DMA32
Node 0, zone Normal
Node 1, zone Normal
Node 2, zone Normal
Node 3, zone Normal
A reclaim that does per zone reclaim (but in reality reclaims all objects
in a node (or worse as most shrinkers do today in the whole system) will
put 3x the pressure on node 0.
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next prev parent reply other threads:[~2010-10-22 16:32 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 [this message]
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
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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