Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

[Mike Galbraith]

On Tue, 2015-08-18 at 13:31 -0700, Tejun Heo wrote:

> So, this is a trade-off we're consciously making.  If there are
> common-enough use cases which require jumping across different cgroup
> domains, we'll try to figure out a way to accomodate those but by
> default migration is a very cold and expensive path.

Hm.  I know of a big data outfit to which attach/detach performance was
important enough for them to have plucked an old experimental overhead
reduction hack (mine) off lkml, and shipped it.  It must have mattered a
LOT for them (not suicidal crash test dummies) to have done that.

	-Mike

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