linux-kernel - Re: [rfc] increase struct page size?!

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Message-ID: <Pine.LNX.4.64.0705191121480.17008@schroedinger.engr.sgi.com>
Date:	Sat, 19 May 2007 11:25:12 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	William Lee Irwin III <wli@...omorphy.com>
cc:	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-arch@...r.kernel.org
Subject: Re: [rfc] increase struct page size?!

On Sat, 19 May 2007, William Lee Irwin III wrote:

> However, there are numerous optimizations and features made possible
> with flag bits, which might as could be made cheap by padding struct
> page up to the next highest power of 2 bytes with space for flag bits.

Well the last time I tried to get this by Andi we became a bit concerned 
when we realized that the memory map would grow by 14% in size. Given 
that 4k page size challenged platforms have a huge amount of page structs 
that growth is significant. I think it would be fine to do it for IA64 
with 16k page size but not for x86_64.


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