linux-kernel - Re: [PATCH 1/4] compcache: xvmalloc memory allocator

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Message-ID: <84144f020908260919ke9d6c34qb47c3015ee0ca89b@mail.gmail.com>
Date:	Wed, 26 Aug 2009 19:19:40 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Nitin Gupta <ngupta@...are.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-mm-cc@...top.org
Subject: Re: [PATCH 1/4] compcache: xvmalloc memory allocator

On Wed, 26 Aug 2009, Nitin Gupta wrote:
>> I went crazy. I meant 40 bits for PFN -- not 48. This 40-bit PFN should be
>> sufficient for all archs. For archs where 40 + PAGE_SHIFT < MAX_PHYSMEM_BITS
>> ramzswap will just issue a compiler error.

On Wed, Aug 26, 2009 at 7:10 PM, Christoph
Lameter<cl@...ux-foundation.org> wrote:
> How about restricting the xvmalloc memory allocator to 32 bit? If I
> understand correctly xvmalloc main use in on 32 bit in order to be
> able to use HIGHMEM?

That was the main reason for a specialized allocator rather than
trying to use SLOB. However, if "xvmalloc" is merged with ramzswap, it
makes sense to use it on desktop class 64-bit machines as well.

                                Pekka
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