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xen-devel
[Xen-devel] Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsyste
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To: |
balbir@xxxxxxxxxxxxxxxxxx |
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Subject: |
[Xen-devel] Re: [PATCH 4/7] bio-cgroup: Split the cgroup memory subsystem into two parts |
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From: |
Hirokazu Takahashi <taka@xxxxxxxxxxxxx> |
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Date: |
Tue, 19 Aug 2008 21:46:35 +0900 (JST) |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, containers@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxx, agk@xxxxxxxxxxxxxx, ryov@xxxxxxxxxxxxx, fernando@xxxxxxxxxxxxx, kamezawa.hiroyu@xxxxxxxxxxxxxx, xemul@xxxxxxxxxx |
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Tue, 19 Aug 2008 05:47:01 -0700 |
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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.
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