linux-kernel - Re: [RFC] respect the referenced bit of KVM guest pages?

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Message-ID: <20090806210955.GA14201@c2.user-mode-linux.org>
Date:	Thu, 6 Aug 2009 17:09:55 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Avi Kivity <avi@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	"Yu, Wilfred" <wilfred.yu@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [RFC] respect the referenced bit of KVM guest pages?

Side question -
	Is there a good reason for this to be in shrink_active_list()
as opposed to __isolate_lru_page?

		if (unlikely(!page_evictable(page, NULL))) {
			putback_lru_page(page);
			continue;
		}

Maybe we want to minimize the amount of code under the lru lock or
avoid duplicate logic in the isolate_page functions.

But if there are important mlock-heavy workloads, this could make the
scan come up empty, or at least emptier than we might like.

				Jeff

-- 
Work email - jdike at linux dot intel dot com
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