Messages in this thread | | | Date | Fri, 17 Apr 2009 15:34:53 +0800 | From | Gui Jianfeng <> | Subject | Re: [PATCH 1/9] io-throttle documentation |
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KAMEZAWA Hiroyuki wrote: > On Tue, 14 Apr 2009 22:21:12 +0200 > Andrea Righi <righi.andrea@gmail.com> wrote: > >> +Example: >> +* Create an association between an io-throttle group and a bio-cgroup group >> + with "bio" and "blockio" subsystems mounted in different mount points: >> + # mount -t cgroup -o bio bio-cgroup /mnt/bio-cgroup/ >> + # cd /mnt/bio-cgroup/ >> + # mkdir bio-grp >> + # cat bio-grp/bio.id >> + 1 >> + # mount -t cgroup -o blockio blockio /mnt/io-throttle >> + # cd /mnt/io-throttle >> + # mkdir foo >> + # echo 1 > foo/blockio.bio_id > > Why do we need multiple cgroups at once to track I/O ? > Seems complicated to me.
Hi Kamezawa-san,
The original thought to implement this function is for sharing a bio-cgroup with other subsystems, such as dm-ioband. If the bio-cgroup is already mounted, and used by dm-ioband or others, we just need to create a association between io-throttle and bio-cgroup by echo a bio-cgroup id, just like what dm-ioband does.
> > Thanks, > -Kame > > > >
-- Regards Gui Jianfeng
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