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Date: Tue, 19 Aug 2008 21:46:35 +0900 (JST) From: Hirokazu Takahashi <taka@...inux.co.jp> To: balbir@...ux.vnet.ibm.com Cc: ryov@...inux.co.jp, kamezawa.hiroyu@...fujitsu.com, xen-devel@...ts.xensource.com, containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, dm-devel@...hat.com, agk@...rceware.org, xemul@...nvz.org, fernando@....ntt.co.jp Subject: Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into two parts Hi, > >> I'm now writing remove-lock-page-cgroup patches. it works well. > >> please wait for a while... > > > > I'm looking forward to those patches. > > > > By the way, I'm glad if memory-cgroup has a feature which can make a > > page_cgroup move between cgroups with small overhead. It makes > > bio-cgroup improve the accuracy of tracking down pages. > > Page movement can be a very expensive operation and is proportional to the size > of the control group. I think movement should be an optional feature, if we ever > add it. Yes, we should avoid moving pages as far as it is balanced fairly well between groups. But I want to move pages between bio-cgoups in case it started charging quite a few I/O requests to a wrong bio-cgroup. I think it will be okay if pages moves between bio-cgroups, but they don't need to move between memory cgroups. I know the latter is really heavy and the effect seems to be so limited. Thanks, Hirokazu Takahashi. -- 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/
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