[PATCH v2 0/2] sched: blk: Handle HMP systems when completing IO

[Qais Yousef]

Due to recent changes in how topology is represented on asymmetric multi
processing systems like big.LITTLE where all cpus share the last LLC, there is
a performance regression as cpus with different compute capacities appear under
the same LLC and we no longer send an IPI when the requester is running on
a different cluster with different compute capacity.

Restore the old behavior by adding a new cpus_equal_capacity() function to help
check for the new condition for these systems.

Changes since v1:

	* Split the patch per subsystem.
	* Convert cpus_gte_capacity() to cpus_equal_capacity()
	* Make cpus_equal_capacity() return immediately for SMP systems.

Qais Yousef (2):
  sched: Add a new function to compare if two cpus have the same
    capacity
  block/blk-mq: Don't complete locally if capacities are different

 block/blk-mq.c                 |  5 +++--
 include/linux/sched/topology.h |  6 ++++++
 kernel/sched/core.c            | 11 +++++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

-- 
2.34.1