Re: [PATCH 08/17] blkcg: shoot down blkio_groups on elevator switch

[Tejun Heo]

On Mon, Jan 23, 2012 at 01:32:07PM -0500, Vivek Goyal wrote:
> This is not just specific to blk-throttle. If in future throttling policy
> is removable like elevator, then it will be fine to reset the throttling
> related configuration upon removal of throttling policy. But resetting
> throttling configuration without policy going anywhere does not sound good.

Yeah, that is a compromise.  As long as those configurations are
per-queue, which is the way it's gonna be after the clean up, I don't
think it's a big deal tho.  We'll be saying "if you make changes to
the set of blkcg policies applied to a device, all blkcg
configurations regarding the device will be reset" instead of "if any
change to blkcg policies happen system-wide, all blkcg configurations
will be reset", and the former doesn't sound crazy to me.  Anyways,
let's see how complex doing the finer grained thing gets.

-- 
tejun
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