From: Michal Hocko <redacted>
Date: Tue, 27 Oct 2015 13:26:47 +0100

On Mon 26-10-15 12:56:19, Johannes Weiner wrote:
[...]

quoted

Or any other combination of pick-and-choose consumers. But
honestly, nowadays all our paths are lockless, and the counting is an
atomic-add-return with a per-cpu batch cache.

You are still hooking into hot paths and there are users who want to
squeeze every single cycle from the HW.

Yeah, you're basically probably undoing a half year of work by another
developer who was able to remove an atomic from these paths.