linux-kernel - Re: [PATCH 1/2] mm: use list.h for vma list

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Message-Id: <20090312172619.43BA.A69D9226@jp.fujitsu.com>
Date:	Thu, 12 Mar 2009 17:32:49 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	kosaki.motohiro@...fujitsu.com,
	Daniel Lowengrub <lowdanie@...il.com>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...e.hu>, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: use list.h for vma list

> On Wednesday 11 March 2009 20:55:48 Daniel Lowengrub wrote:
> > Use the linked list defined list.h for the list of vmas that's stored
> > in the mm_struct structure.  Wrapper functions "vma_next" and
> > "vma_prev" are also implemented.  Functions that operate on more than
> > one vma are now given a list of vmas as input.
> 
> I'd love to be able to justify having a doubly linked list for vmas...
> It's easier than managing singly linked lists by hand :) So if you have
> such a good increase with lookups, it might be a good idea. I wouldn't
> like to see vm_area_struct go above 192 bytes on any config if possible
> though.

Currently, sizeof(struct vm_area_struct) on x86_64 is 176.
if we assume 32byte cache-line, 176byte is 6 cache-line.
then, making coubly linked list don't cause d-cache pollution. 

Therefore, We can merge this patch after some cleanups.
(of cource, your opining cleanups is obiously necessary...)



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