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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 5 Aug 2009 09:12:39 -0700
From:	"Dike, Jeffrey G" <jeffrey.g.dike@...el.com>
To:	Andrea Arcangeli <aarcange@...hat.com>, Avi Kivity <avi@...hat.com>
CC:	"Wu, Fengguang" <fengguang.wu@...el.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?

> It can't distinguish. Besides the pages being refaulted (as minor
> faults) implies they weren't collected yet. So the fact they are
> allowed to stay on active list or not can't matter or alter the
> refaulting issue.

Sounds like there's some terminology confusion.  A refault is a page being discarded due to memory pressure and subsequently being faulted back in.  I was counting the number of faults between the discard and faulting back in for each affected page.  For a large number of predominately stack pages, that number was very small.

					Jeff
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/