linux-kernel - Re: [PATCH 2/3] mm: make the threshold of enabling THP configurable

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Message-ID: <4E01C80F.8070605@redhat.com>
Date:	Wed, 22 Jun 2011 18:46:39 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Andrea Arcangeli <aarcange@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/3] mm: make the threshold of enabling THP configurable

于 2011年06月22日 17:16, Mel Gorman 写道:
>
> What I meant was that there is a rational reason why 512M is the
> default for enabling THP by default. Tuning it lower than that by any
> means makes very little sense. Tuning it higher might make some sense
> but it is more likely that THP would simply be disabled via sysctl. I
> see very little advantage to introducing this Kconfig option other
> than as a source of confusion when running make oldconfig.
>

The tunable range is (512, 8192), so 512M is the minimum.

Sure, I knew it can be disabled via /sys, actually we can do even
more in user-space, that is totally move the 512M check out of kernel,
why we didn't?

In short, I think we should either remove the 512M from kernel, or
make 512M to be tunable.

Thanks.
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