From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <andi@firstfloor.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Miller <davem@davemloft.net>,
Andrew Morton <akpm@linux-foundation.org>,
Daniel Phillips <phillips@google.com>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Matt Mackall <mpm@selenic.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Steve Dickson <SteveD@redhat.com>
Subject: Re: [PATCH 03/10] mm: tag reseve pages
Date: Mon, 06 Aug 2007 20:47:59 +0200 [thread overview]
Message-ID: <1186426079.11797.88.camel@lappy> (raw)
In-Reply-To: <Pine.LNX.4.64.0708061143050.3152@schroedinger.engr.sgi.com>
On Mon, 2007-08-06 at 11:43 -0700, Christoph Lameter wrote:
> On Mon, 6 Aug 2007, Andi Kleen wrote:
>
> > > > pgoff_t index; /* Our offset within mapping. */
> > > > void *freelist; /* SLUB: freelist req. slab lock */
> > > > + int reserve; /* page_alloc: page is a reserve page */
> > >
> > > Extending page struct ???
> >
> > Note it's an union.
>
> Ok. Then under what conditions can we use reserve? Right after alloc?
Yes, its usually only observed right after alloc. Its basically an extra
return value.
Daniel suggested it was about saving page flags, _maybe_. The value is
1) rare and 2) usually only interesting right after alloc. So wasting a
precious page flag which would keep this state for the duration of the
whole allocation seemed like a waste.
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next prev parent reply other threads:[~2007-08-06 18:47 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 [this message]
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
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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