Messages in this thread | | | Date | Thu, 24 Jan 2008 01:21:03 +0900 (JST) | Subject | Re: [dm-devel] [PATCH 0/2] dm-band: The I/O bandwidth controller: Overview | From | Hirokazu Takahashi <> |
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Hi,
> On Wed, Jan 23, 2008 at 09:53:50PM +0900, Ryo Tsuruta wrote: > > Dm-band gives bandwidth to each job according to its weight, > > which each job can set its own value to. > > At this time, a job is a group of processes with the same pid or pgrp or uid. > > It seems to rely on 'current' to classify bios and doesn't do it until the map > function is called, possibly in a different process context, so it won't > always identify the original source of the I/O correctly:
Yes, this should be mentioned in the document with the current implementation as you pointed out.
By the way, I think once a memory controller of cgroup is introduced, it will help to track down which cgroup is the original source.
> people need to take > this into account when designing their group configuration and so this should > be mentioned in the documentation. > > I've uploaded it here while we consider ways we might refine the architecture and > interfaces etc.: > > http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/dm-add-band-target.patch > > Alasdair > -- > agk@redhat.com
Thank you, Hirokazu Takahashi.
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