From: Christoph Lameter <clameter@sgi.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Matt Mackall <mpm@selenic.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>,
Daniel Phillips <phillips@google.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Steve Dickson <SteveD@redhat.com>
Subject: Re: [PATCH 04/10] mm: slub: add knowledge of reserve pages
Date: Wed, 8 Aug 2007 10:57:13 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0708081050590.12652@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070808103946.4cece16c.akpm@linux-foundation.org>
On Wed, 8 Aug 2007, Andrew Morton wrote:
> 3. Perform page reclaim from hard IRQ context. Pretty simple to
> implement, most of the work would be needed in the rmap code. It might be
> better to make it opt-in via a new __GFP_flag.
In a hardirq context one is bound to a processor and through the slab
allocator to a slab from which one allocates objects. The slab is per cpu
and so the slab is reserved for the current context. Nothing can take
objects away from it. The modifications here would not be needed for that
context.
I think in general irq context reclaim is doable. Cannot see obvious
issues on a first superficial pass through rmap.c. The irq holdoff would
be pretty long though which may make it unacceptable.
--
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next prev parent reply other threads:[~2007-08-08 17:57 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-06 10:29 [PATCH 00/10] foundations for reserve-based allocation Peter Zijlstra
2007-08-06 10:29 ` [PATCH 01/10] mm: gfp_to_alloc_flags() Peter Zijlstra
2007-08-06 10:29 ` [PATCH 02/10] mm: system wide ALLOC_NO_WATERMARK Peter Zijlstra
2007-08-06 18:11 ` Christoph Lameter
2007-08-06 18:21 ` Daniel Phillips
2007-08-06 18:31 ` Peter Zijlstra
2007-08-06 18:43 ` Daniel Phillips
2007-08-06 19:11 ` Christoph Lameter
2007-08-06 19:31 ` Peter Zijlstra
2007-08-06 20:12 ` Christoph Lameter
2007-08-06 18:42 ` Christoph Lameter
2007-08-06 18:48 ` Daniel Phillips
2007-08-06 18:51 ` Christoph Lameter
2007-08-06 19:15 ` Daniel Phillips
2007-08-06 20:12 ` Matt Mackall
2007-08-06 20:19 ` Christoph Lameter
2007-08-06 20:26 ` Peter Zijlstra
2007-08-06 21:05 ` Christoph Lameter
2007-08-06 22:59 ` Daniel Phillips
2007-08-06 23:14 ` Christoph Lameter
2007-08-06 23:49 ` Daniel Phillips
2007-08-07 22:18 ` Christoph Lameter
2007-08-08 7:24 ` Peter Zijlstra
2007-08-08 18:06 ` Christoph Lameter
2007-08-08 7:37 ` Daniel Phillips
2007-08-08 18:09 ` Christoph Lameter
2007-08-09 18:41 ` Daniel Phillips
2007-08-09 18:49 ` Christoph Lameter
2007-08-10 0:17 ` Daniel Phillips
2007-08-10 1:48 ` Christoph Lameter
2007-08-10 3:34 ` Daniel Phillips
2007-08-10 3:48 ` Christoph Lameter
2007-08-10 8:15 ` Daniel Phillips
2007-08-10 17:46 ` Christoph Lameter
2007-08-10 23:25 ` Daniel Phillips
2007-08-13 6:55 ` Daniel Phillips
2007-08-13 23:04 ` Christoph Lameter
2007-08-06 20:27 ` Andrew Morton
2007-08-06 23:16 ` Daniel Phillips
2007-08-06 22:47 ` Daniel Phillips
2007-08-06 10:29 ` [PATCH 03/10] mm: tag reseve pages Peter Zijlstra
2007-08-06 18:11 ` Christoph Lameter
2007-08-06 18:13 ` Daniel Phillips
2007-08-06 18:28 ` Peter Zijlstra
2007-08-06 19:34 ` Andi Kleen
2007-08-06 18:43 ` Christoph Lameter
2007-08-06 18:47 ` Peter Zijlstra
2007-08-06 18:59 ` Andi Kleen
2007-08-06 19:09 ` Christoph Lameter
2007-08-06 19:10 ` Andrew Morton
2007-08-06 19:16 ` Christoph Lameter
2007-08-06 19:38 ` Matt Mackall
2007-08-06 20:18 ` Andi Kleen
2007-08-06 10:29 ` [PATCH 04/10] mm: slub: add knowledge of reserve pages Peter Zijlstra
2007-08-08 0:13 ` Christoph Lameter
2007-08-08 1:44 ` Matt Mackall
2007-08-08 17:13 ` Christoph Lameter
2007-08-08 17:39 ` Andrew Morton
2007-08-08 17:57 ` Christoph Lameter [this message]
2007-08-08 18:46 ` Andrew Morton
2007-08-10 1:54 ` Daniel Phillips
2007-08-10 2:01 ` Christoph Lameter
2007-08-20 7:38 ` Peter Zijlstra
2007-08-20 7:43 ` Peter Zijlstra
2007-08-20 9:12 ` Pekka J Enberg
2007-08-20 9:17 ` Peter Zijlstra
2007-08-20 9:28 ` Pekka Enberg
2007-08-20 19:26 ` Christoph Lameter
2007-08-20 20:08 ` Peter Zijlstra
2007-08-06 10:29 ` [PATCH 05/10] mm: allow mempool to fall back to memalloc reserves Peter Zijlstra
2007-08-06 10:29 ` [PATCH 06/10] mm: kmem_estimate_pages() Peter Zijlstra
2007-08-06 10:29 ` [PATCH 07/10] mm: allow PF_MEMALLOC from softirq context Peter Zijlstra
2007-08-06 10:29 ` [PATCH 08/10] mm: serialize access to min_free_kbytes Peter Zijlstra
2007-08-06 10:29 ` [PATCH 09/10] mm: emergency pool Peter Zijlstra
2007-08-06 10:29 ` [PATCH 10/10] mm: __GFP_MEMALLOC Peter Zijlstra
2007-08-06 17:35 ` [PATCH 00/10] foundations for reserve-based allocation Daniel Phillips
2007-08-06 18:17 ` Peter Zijlstra
2007-08-06 18:40 ` Daniel Phillips
2007-08-06 19:31 ` Daniel Phillips
2007-08-06 19:36 ` Peter Zijlstra
2007-08-06 19:53 ` Daniel Phillips
2007-08-06 17:56 ` Christoph Lameter
2007-08-06 18:33 ` Peter Zijlstra
2007-08-06 20:23 ` Matt Mackall
2007-08-07 0:09 ` Daniel Phillips
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