Re: [patch 00/16] CFS Bandwidth Control v7

Peter Zijlstra
2011-06-23T12:07:51Z

On Wed, 2011-06-22 at 19:05 +0900, Hidetoshi Seto wrote:
> I'll continue my test/benchmark on this v7 for a while.
> Though I believe no more bug is there, I'll let you know if there is
> something.

Would that testing include performance of a kernel without these patches
vs one with these patches in a configuration where the new feature is
compiled in but not used?

It does add a number of if (!cfs_rq->runtime_enabled) return branches
all over the place, some possibly inside a function call (depending on
what the auto-inliner does). So while the impact should be minimal, it
would be very good to test it is indeed so.