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From: Qais Yousef <qyousef@layalina.io>
To: Jens Axboe <axboe@kernel.dk>,
	Ingo Molnar <mingo@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: linux-kernel@vger.kernel.org,
	linux-block@vger.kernel.org,
	Sudeep Holla <sudeep.holla@arm.com>,
	Wei Wang <wvw@google.com>,
	Jaegeuk Kim <jaegeuk@kernel.org>,
	Bart Van Assche <bvanassche@acm.org>,
	Christoph Hellwig <hch@infradead.org>,
	Qais Yousef <qyousef@layalina.io>
Subject: [PATCH v2 0/2] sched: blk: Handle HMP systems when completing IO
Date: Fri, 23 Feb 2024 15:57:47 +0000
Message-Id: <20240223155749.2958009-1-qyousef@layalina.io>
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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