linux-kernel - Re: [PATCH 3/9] kstaled: page_referenced_kstaled() and supporting infrastructure.

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Message-ID: <CANN689GuZHzCa4Xr-YwPrpvy8Fcff4pQLrDQ+a+G_56mvBMwMQ@mail.gmail.com>
Date:	Wed, 28 Sep 2011 17:09:32 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Balbir Singh <bsingharora@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michael Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 3/9] kstaled: page_referenced_kstaled() and supporting infrastructure.

On Wed, Sep 28, 2011 at 12:18 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> 2 questions.
>
> What happens at Transparent HugeTLB pages are splitted/collapsed ?

Nothing special - at the next scan, pages are counted again
considering their new size.

> Does this feature can ignore page migration i.e. flags should not be copied ?

We're not doing it currently. As I understand, the migrate code does
not copy the PTE young bits either, nor does it try to preserve page
order in the LRU lists. So it's not transparent to the LRU algorithms,
but it does not cause incorrect behavior either.

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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