linux-kernel - Re: [PATCH 4/4] mm: introduce no

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Message-ID: <20110621133236.GP20843@redhat.com>
Date:	Tue, 21 Jun 2011 15:32:36 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	linux-mm@...ck.org
Subject: Re: [PATCH 4/4] mm: introduce no_ksm to disable totally KSM

On Tue, Jun 21, 2011 at 04:10:45PM +0800, Amerigo Wang wrote:
> Introduce a new kernel parameter "no_ksm" to totally disable KSM.

Here as well this is the wrong approach. If you want to save memory,
you should make ksmd quit when run=0 and start only when setting
ksm/run=1. And move the daemon hashes and slabs initializations to the
ksmd daemon start. Not registering in sysfs and crippling down the
feature despite you loaded the proper .text into memory isn't good.
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