linux-kernel - Re: [PATCH v2 2/4] mm: make the threshold of enabling THP configurable

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Message-ID: <4E015C36.2050005@redhat.com>
Date:	Wed, 22 Jun 2011 11:06:30 +0800
From:	Cong Wang <amwang@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	dave@...ux.vnet.ibm.com, 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 v2 2/4] mm: make the threshold of enabling THP configurable

于 2011年06月22日 09:23, David Rientjes 写道:
> On Tue, 21 Jun 2011, Amerigo Wang wrote:
>
>> Don't hard-code 512M as the threshold in kernel, make it configruable,
>> and set 512M by default.
>>
>> And print info when THP is disabled automatically on small systems.
>>
>> V2: Add more description in help messages, correct some typos,
>> print the mini threshold too.
>>
>
> I like the printk that notifies users why THP was disabled because it
> could potentially be a source of confusion (and fixing the existing typos
> in hugepage_init() would also be good).  However, I disagree that we need
> to have this as a config option: you either want the feature for your
> systems or you don't.  Perhaps add a "transparent_hugepage=force" option
> that will act as "always" but also force it to be enabled in all
> scenarios, even without X86_FEATURE_PSE, that will override all the logic
> that thinks it knows better?

I think that is overkill, because we can still enable THP via /sys
for small systems.

Thanks.
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