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

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Message-ID: <4DFF8050.9070201@redhat.com>
Date:	Tue, 21 Jun 2011 01:16:00 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mel@....ul.ie>,
	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21日 00:59, Mel Gorman 写道:
> On Tue, Jun 21, 2011 at 12:34:29AM +0800, Amerigo Wang wrote:
>> Don't hard-code 512M as the threshold in kernel, make it configruable,
>> and set 512M by default.
>>
>
> I'm not seeing the gain here either. This is something that is going to
> be set by distributions and probably never by users. If the default of
> 512 is incorrect, what should it be? Also, the Kconfig help message has
> spelling errors.
>

Sorry for spelling errors, I am not an English speaker.

Hard-coding is almost never a good thing in kernel, enforcing 512
is not good either. Since the default is still 512, I don't think this
will affect much users.

I do agree to improve the help message, like Dave mentioned in his reply,
but I don't like enforcing a hard-coded number in kernel.

BTW, why do you think 512 is suitable for *all* users?

Thanks.
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