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
| ||
|
Date: Tue, 10 Jul 2007 14:24:59 +0100 From: mel@...net.ie (Mel Gorman) To: Peter Zijlstra <a.p.zijlstra@...llo.nl> Cc: Andrew Morton <akpm@...ux-foundation.org>, npiggin@...e.de, kenchen@...gle.com, jschopp@...tin.ibm.com, apw@...dowen.org, kamezawa.hiroyu@...fujitsu.com, y-goto@...fujitsu.com, clameter@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: -mm merge plans -- anti-fragmentation On (10/07/07 13:04), Peter Zijlstra didst pronounce: > On Tue, 2007-07-10 at 11:20 +0100, Mel Gorman wrote: > > <snip> > > > > lumpy-reclaim-v4.patch > > > > This patch is really what lumpy reclaim is. I believe Peter has looked > > at this and was happy enough at the time although he is cc'd here again > > in case this has changed. This is mainly useful with either grouping > > pages by mobility or the ZONE_MOVABLE stuff. However, at the time the > > patch was proposed, there was a feeling that it might help jumbo frame > > allocation on e1000's and maybe if fsblock optimistically uses > > contiguous pages it would have an application. I would like to see it go > > through to see does it help e1000 at least. > > I'm not seeing how this will help e1000 (and other jumbo drivers). They > typically allocate using GFP_ATOMIC, so in order to satisfy those you'd > need to either have a higher order watermark or do atomic defrag of the > free space. > It does help somewhat indirectly and in an unsatisfactory manner. When the higher watermarks are breached, the atomic allocation will still succeeed but kswapd will be poked to reclaim at a given order. This is similar to the problems SLUB hits when it uses high-orders frequently. -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab - 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/
Powered by blists - more mailing lists