linux-kernel - Re: How kernel applies LRU to swap out physical 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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Wed, 12 Nov 2008 09:36:43 +0800
From:	"Pan ruochen" <panruochen@...il.com>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: How kernel applies LRU to swap out physical pages?

Thanks to all, I've have a study.

2008/11/11 Peter Zijlstra <peterz@...radead.org>:
> On Tue, 2008-11-11 at 18:56 +0900, KOSAKI Motohiro wrote:
>> > On Tue, 2008-11-11 at 16:22 +0800, Pan ruochen wrote:
>> > > Hi All,
>> > > I'm reading the linux kernel 2.6.14. But can't understand how LRU algorithm
>> > > is applied to page swapping. what is the 'USED' of LRU referred to? The
>> > > reference counter which the page is mapped by processes, or the frequency that
>> > > CPU reads/writes in the page. In common sense, the LRU algorithm will be more
>> > > optimal for the second case. But it depends on CPU capability.
>> > > I will be very appreciated if somebody can explain that in details.
>> >
>> > We don't actually use LRU but something like CLOCK.
>
> FWIW in case you hadn't found it yet:
>
>  http://en.wikipedia.org/wiki/Page_replacement_algorithm
>
> is a fairly decent page on the subject.
>
--
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/