linux-kernel - Re: [PATCH 2/6] thp: optimize away unnecessary page table locking

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Message-Id: <20120209111950.b3e626d1.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 9 Feb 2012 11:19:50 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] thp: optimize away unnecessary page table locking

On Wed,  8 Feb 2012 10:51:38 -0500
Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> Currently when we check if we can handle thp as it is or we need to
> split it into regular sized pages, we hold page table lock prior to
> check whether a given pmd is mapping thp or not. Because of this,
> when it's not "huge pmd" we suffer from unnecessary lock/unlock overhead.
> To remove it, this patch introduces a optimized check function and
> replace several similar logics with it.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: David Rientjes <rientjes@...gle.com>
> 

I prefer 'bool' for return type..but seems much better.

Thank you. I think this clean up is very good.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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