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

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Message-Id: <20110928161805.8acb33c5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 28 Sep 2011 16:18:05 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michel Lespinasse <walken@...gle.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 Tue, 27 Sep 2011 17:49:01 -0700
Michel Lespinasse <walken@...gle.com> wrote:

> Add a new page_referenced_kstaled() interface. The desired behavior
> is that page_referenced() returns page references since the last
> page_referenced() call, and page_referenced_kstaled() returns page
> references since the last page_referenced_kstaled() call, but they
> are both independent of each other and do not influence each other.
> 
> The following events are counted as kstaled page references:
> - CPU data access to the page (as noticed through pte_young());
> - mark_page_accessed() calls;
> - page being freed / reallocated.
> 
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

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

2 questions.

What happens at Transparent HugeTLB pages are splitted/collapsed ?
Does this feature can ignore page migration i.e. flags should not be copied ?

Thanks,
-Kame

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