From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Christoph Lameter <clameter@sgi.com>
Cc: netdev@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>
Subject: Re: [RFC][PATCH 1/6] mm: slab allocation fairness
Date: Thu, 30 Nov 2006 21:15:15 +0100 [thread overview]
Message-ID: <1164917715.6588.177.camel@twins> (raw)
In-Reply-To: <Pine.LNX.4.64.0611301210190.24331@schroedinger.engr.sgi.com>
On Thu, 2006-11-30 at 12:11 -0800, Christoph Lameter wrote:
> On Thu, 30 Nov 2006, Peter Zijlstra wrote:
>
> > Sure, but there is nothing wrong with using a slab page with a lower
> > allocation rank when there is memory aplenty.
>
> What does "a slab page with a lower allocation rank" mean? Slab pages have
> no allocation ranks that I am aware of.
I just added allocation rank and didn't you suggest tracking it for all
slab pages instead of per slab?
The rank is an expression of how hard it was to get that page, with 0
being the hardest allocation (ALLOC_NO_WATERMARK) and 16 the easiest
(ALLOC_WMARK_HIGH).
I store the rank of the last allocated page and retest the rank when a
gfp flag indicates a higher rank, that is when the current slab
allocation would have failed to grow the slab under the conditions of
the previous allocation.
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next prev parent reply other threads:[~2006-11-30 20:15 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-30 10:14 [RFC][PATCH 0/6] VM deadlock avoidance -v9 Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 1/6] mm: slab allocation fairness Peter Zijlstra
2006-11-30 18:52 ` Christoph Lameter
2006-11-30 18:55 ` Peter Zijlstra
2006-11-30 19:33 ` Christoph Lameter
2006-11-30 19:33 ` Peter Zijlstra
2006-12-01 11:28 ` Peter Zijlstra
2006-11-30 19:02 ` Peter Zijlstra
2006-11-30 19:37 ` Christoph Lameter
2006-11-30 19:40 ` Peter Zijlstra
2006-11-30 20:11 ` Christoph Lameter
2006-11-30 20:15 ` Peter Zijlstra [this message]
2006-11-30 20:29 ` Christoph Lameter
2006-11-30 10:14 ` [RFC][PATCH 2/6] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 3/6] mm: serialize access to min_free_kbytes Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 4/6] mm: emergency pool and __GFP_EMERGENCY Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 5/6] slab: kmem_cache_objs_to_pages() Peter Zijlstra
2006-11-30 18:55 ` Christoph Lameter
2006-11-30 18:55 ` Peter Zijlstra
2006-11-30 19:06 ` Christoph Lameter
2006-11-30 19:03 ` Peter Zijlstra
2006-12-01 12:14 ` Peter Zijlstra
2006-11-30 10:14 ` [RFC][PATCH 6/6] net: vm deadlock avoidance core Peter Zijlstra
2006-11-30 12:04 ` Peter Zijlstra
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