linux-kernel - sync_mm

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Message-ID: <30859.1268056796@redhat.com>
Date:	Mon, 08 Mar 2010 13:59:56 +0000
From:	David Howells <dhowells@...hat.com>
To:	kamezawa.hiroyu@...fujitsu.com, torvalds@...l.org
cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: sync_mm_rss() issues


There are a couple of issues with sync_mm_rss(), as added by patch:

	commit 34e55232e59f7b19050267a05ff1226e5cd122a5
	Author: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
	Date:   Fri Mar 5 13:41:40 2010 -0800
	Subject: mm: avoid false sharing of mm_counter

 (1) You haven't implemented it for NOMMU mode.  What's the right way to do
     this?  Just give an empty function?

 (2) linux/mm.h should carry the empty function as an inline when
     CONFIG_SPLIT_RSS_COUNTING=n, rather than it being defined as an empty
     function in mm/memory.c.

David
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