linux-kernel - Re: [PATCH 1/3] mm: completely disable THP by transparent

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Message-ID: <4E000CB5.3050201@redhat.com>
Date:	Tue, 21 Jun 2011 11:15:01 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/3] mm: completely disable THP by transparent_hugepage=never

于 2011年06月21日 03:43, Andrea Arcangeli 写道:
> On Tue, Jun 21, 2011 at 01:01:17AM +0800, Cong Wang wrote:
>> Without this patch, THP is still initialized (although khugepaged is not started),
>> that is what I don't want to see when I pass "transparent_hugepage=never",
>> because "never" for me means THP is totally unseen, even not initialized.
>
> The ram saving by not registering in sysfs is not worth the loss of
> generic functionality. You can try to make the hash and slab
> khugepaged allocations more dynamic if you want to microoptimize for
> RAM usage, that I wouldn't be against if you find a way to do it
> simply and without much complexity (and .text) added. But likely there
> are other places to optimize that may introduce less tricks and would
> give you a bigger saving than ~8kbytes, it's up to you.

But the THP functionality is not going to be used.

Yeah, sounds reasonable, I will try to check if I can make it.

Thanks for pointing this out!
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