From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Martin Bligh <mbligh@mbligh.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
akpm@google.com, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
James Bottomley <James.Bottomley@steeleye.com>,
linux-mm@kvack.org
Subject: Re: More thoughts on getting rid of ZONE_DMA
Date: Sat, 23 Sep 2006 02:39:57 +0200 [thread overview]
Message-ID: <200609230239.57694.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0609221715520.10484@schroedinger.engr.sgi.com>
On Saturday 23 September 2006 02:23, Christoph Lameter wrote:
> On Sat, 23 Sep 2006, Andi Kleen wrote:
>
> > The problem is that if someone has a workload with lots of pinned pages
> > (e.g. lots of mlock) then the first 16MB might fill up completely and there
> > is no chance at all to free it because it's pinned
>
> Ok. That may be a problem for i386. After the removal of the GFP_DMA
> and ZONE_DMA stuff it is then be possible to redefine ZONE_DMA (or
> whatever we may call it ZONE_RESERVE?) to an arbitrary size a the
> beginning of memory. Then alloc_pages_range() can dynamically decide to
> tap that pool if necessary.
That's should work yes. Just we need the pool.
-Andi
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <clameter@sgi.com>
Cc: Martin Bligh <mbligh@mbligh.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
akpm@google.com, linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
James Bottomley <James.Bottomley@steeleye.com>,
linux-mm@kvack.org
Subject: Re: More thoughts on getting rid of ZONE_DMA
Date: Sat, 23 Sep 2006 02:39:57 +0200 [thread overview]
Message-ID: <200609230239.57694.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.64.0609221715520.10484@schroedinger.engr.sgi.com>
On Saturday 23 September 2006 02:23, Christoph Lameter wrote:
> On Sat, 23 Sep 2006, Andi Kleen wrote:
>
> > The problem is that if someone has a workload with lots of pinned pages
> > (e.g. lots of mlock) then the first 16MB might fill up completely and there
> > is no chance at all to free it because it's pinned
>
> Ok. That may be a problem for i386. After the removal of the GFP_DMA
> and ZONE_DMA stuff it is then be possible to redefine ZONE_DMA (or
> whatever we may call it ZONE_RESERVE?) to an arbitrary size a the
> beginning of memory. Then alloc_pages_range() can dynamically decide to
> tap that pool if necessary.
That's should work yes. Just we need the pool.
-Andi
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next prev parent reply other threads:[~2006-09-23 0:40 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-22 4:02 [RFC] Initial alpha-0 for new page allocator API Christoph Lameter
2006-09-22 4:02 ` Christoph Lameter
2006-09-22 6:17 ` Andi Kleen
2006-09-22 6:17 ` Andi Kleen
2006-09-22 16:35 ` Christoph Lameter
2006-09-22 16:35 ` Christoph Lameter
2006-09-22 19:10 ` Andi Kleen
2006-09-22 19:10 ` Andi Kleen
2006-09-22 19:17 ` Christoph Lameter
2006-09-22 19:17 ` Christoph Lameter
2006-09-22 19:24 ` Martin Bligh
2006-09-22 19:24 ` Martin Bligh
2006-09-22 20:10 ` Alan Cox
2006-09-22 20:10 ` Alan Cox
2006-09-22 20:02 ` Andi Kleen
2006-09-22 20:02 ` Andi Kleen
2006-09-22 20:14 ` Martin Bligh
2006-09-22 20:14 ` Martin Bligh
2006-09-22 20:23 ` Christoph Lameter
2006-09-22 20:23 ` Christoph Lameter
2006-09-22 20:41 ` Jesse Barnes
2006-09-22 20:41 ` Jesse Barnes
2006-09-22 21:01 ` Christoph Lameter
2006-09-22 21:01 ` Christoph Lameter
2006-09-22 21:14 ` Jesse Barnes
2006-09-22 21:14 ` Jesse Barnes
2006-09-22 21:21 ` Christoph Lameter
2006-09-22 21:21 ` Christoph Lameter
2006-09-22 20:48 ` Andi Kleen
2006-09-22 20:48 ` Andi Kleen
2006-09-22 21:13 ` Christoph Lameter
2006-09-22 21:13 ` Christoph Lameter
2006-09-22 21:32 ` Christoph Lameter
2006-09-22 21:32 ` Christoph Lameter
2006-09-22 23:34 ` More thoughts on getting rid of ZONE_DMA Andi Kleen
2006-09-22 23:34 ` Andi Kleen
2006-09-23 0:23 ` Christoph Lameter
2006-09-23 0:23 ` Christoph Lameter
2006-09-23 0:39 ` Andi Kleen [this message]
2006-09-23 0:39 ` Andi Kleen
2006-09-23 0:25 ` Christoph Lameter
2006-09-23 0:25 ` Christoph Lameter
2006-09-23 0:37 ` Andi Kleen
2006-09-23 0:37 ` Andi Kleen
2006-09-24 2:13 ` Christoph Lameter
2006-09-24 2:13 ` Christoph Lameter
2006-09-24 2:36 ` Martin J. Bligh
2006-09-24 2:36 ` Martin J. Bligh
2006-09-24 7:26 ` Andi Kleen
2006-09-24 7:26 ` Andi Kleen
2006-09-24 7:19 ` Andi Kleen
2006-09-24 7:19 ` Andi Kleen
2006-09-22 17:36 ` [RFC] Initial alpha-0 for new page allocator API Christoph Lameter
2006-09-22 17:36 ` Christoph Lameter
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