linux-kernel - Re: [PATCH 2/5] lumpy: isolate_lru_pages wants to specifically take active or inactive 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:	Fri, 02 Mar 2007 15:57:14 +0000
From:	Andy Whitcroft <apw@...dowen.org>
To:	Christoph Lameter <clameter@...r.sgi.com>
CC:	Andrew Morton <akpm@...l.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH 2/5] lumpy: isolate_lru_pages wants to specifically take
 active or inactive pages

Christoph Lameter wrote:
> On Tue, 27 Feb 2007, Andy Whitcroft wrote:
> 
>> The caller of isolate_lru_pages specifically knows whether it wants
>> to take either inactive or active pages.  Currently we take the
>> state of the LRU page at hand and use that to scan for matching
>> pages in the order sized block.  If that page is transiting we
>> can scan for the wrong type.  The caller knows what they want and
>> should be telling us.  Pass in the required active/inactive state
>> and match against that.
> 
> The page cannot be transiting since we hold the lru lock?

As you say it should be gated by lru_lock and we should not expect to
see pages with the wrong type on the list.  I would swear that I was
seeing pages on the wrong list there for a bit in testing and mistakenly
thought they were in transition.  A quick review at least says thats
false.  So I'll reinstate the BUG() and retest to see if I am smoking
crack or there is a bigger bug out there.

-apw
-
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/