linux-kernel - Re: [PATCH v2 1/4] mm: completely disable THP by transparent

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Date:	Wed, 22 Jun 2011 13:45:14 +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>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-doc@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 1/4] mm: completely disable THP by transparent_hugepage=0

于 2011年06月22日 11:24, David Rientjes 写道:
> On Wed, 22 Jun 2011, Cong Wang wrote:
>
>>>> Introduce "transparent_hugepage=0" to totally disable THP.
>>>> "transparent_hugepage=never" means setting THP to be partially
>>>> disabled, we need a new way to totally disable it.
>>>>
>>>
>>> Why can't you just compile it off so you never even compile
>>> mm/huge_memory.c in the first place and save the space in the kernel image
>>> as well?  Having the interface available to enable the feature at runtime
>>> is worth the savings this patch provides, in my opinion.
>>
>> https://lkml.org/lkml/2011/6/20/506
>>
>
> If you're proposing a patch for a specific purpose, it's appropriate to
> include that in the changelog.

Sorry, I can't put everything you don't see into the changelog.

>
> But now that I know what you're proposing this for, it's an easy NACK:
> transparent_hugepage=0 has no significant benefit over
> transparent_hugepage=never for kdump because the memory savings is
> negligible.

I hate to repeat things, sorry, please go for the other thread where I
replied to Andrea.

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