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

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Date: Sat, 24 Feb 2024 12:48:56 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
 Vincent Guittot <vincent.guittot@...aro.org>, 
 Dietmar Eggemann <dietmar.eggemann@....com>, 
 Qais Yousef <qyousef@...alina.io>
Cc: linux-kernel@...r.kernel.org, linux-block@...r.kernel.org, 
 Sudeep Holla <sudeep.holla@....com>, Wei Wang <wvw@...gle.com>, 
 Jaegeuk Kim <jaegeuk@...nel.org>, Bart Van Assche <bvanassche@....org>, 
 Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v2 0/2] sched: blk: Handle HMP systems when completing
 IO


On Fri, 23 Feb 2024 15:57:47 +0000, Qais Yousef wrote:
> 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.
> 
> [...]

Applied, thanks!

[1/2] sched: Add a new function to compare if two cpus have the same capacity
      commit: b361c9027b4e4159e7bcca4eb64fd26507c19994
[2/2] block/blk-mq: Don't complete locally if capacities are different
      commit: af550e4c968294398fc76b075f12d51c76caf753

Best regards,
-- 
Jens Axboe