tree 20030c728af441a4efa01c2612be4883bd431115
parent ef557180447fa9a7a0affd3abb21ecceb4b5e125
author Tejun Heo <tj@kernel.org> 1455058778 -0500
committer Tejun Heo <tj@kernel.org> 1455058778 -0500

workqueue: implement "workqueue.debug_force_rr_cpu" debug feature

Workqueue used to guarantee local execution for work items queued
without explicit target CPU.  The guarantee is gone now which can
break some usages in subtle ways.  To flush out those cases, this
patch implements a debug feature which forces round-robin CPU
selection for all such work items.

The debug feature defaults to off and can be enabled with a kernel
parameter.  The default can be flipped with a debug config option.

If you hit this commit during bisection, please refer to 041bd12e272c
("Revert "workqueue: make sure delayed work run in local cpu"") for
more information and ping me.

Signed-off-by: Tejun Heo <tj@kernel.org>