linux-kernel - [mm][RFC][PATCH 0/11] mm accessor updates.

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Message-Id: <20091216120011.3eecfe79.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 16 Dec 2009 12:00:11 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>, cl@...ux-foundation.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...e.hu" <mingo@...e.hu>, andi@...stfloor.org,
	minchan.kim@...il.com
Subject: [mm][RFC][PATCH 0/11] mm accessor updates.

This is from Christoph Lameter's mm_accessor patch posted 5/Nov.

Replacing all access to mm->mmap_sem with mm-accessor functions as
 mm_read_lock,
 mm_write_lock,
 etc...

This kind of function allows us to improve page fault performance etc..
For example, skil down_read(mmap_sem) in some situation.
(as: http://marc.info/?l=linux-mm&m=125809791306459&w=2)

Because I like this idea, I updated his patch. But the size of patch is
very big and mmap_sem is used in many place, some senario for merging
will be required. Spliting into small pieace and go ahead in step by step.

My plan is...
  1. leave  mm->mmap_sem as it is for a while.
  2. replace all mmap_sem access under /kernel /mm /fs etc..
  3. replace all mmap_sem callers under /driver
  4. And finally, post per-arch patches.

Now this set is organized as
 [1/11] mm_accessor definition
 [2/11] a patch for kernel, mm
 [3/11] a patch for fs (procfs and codes around get_user_page())
 [4/11] a patch for kvm
 [5/11] a patch for tomoyo
 [6/11] a patch for driver/gpu
 [7/11] a patch for infiniband
 [8/11] a patch for driver/media/video
 [9/11] a patch for sgi gru
 [10/11] a patch for misc drivers
 [11/11] a patch for x86.

I think, once I push [1/11] (and 2/11]), I can update other calls in each tree.
And finally successfully rename mm->mmap_sem to some other name.

Any comment is welcome.

Thanks,
-Kame

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