linux-kernel - Re: [PATCHv2] cpufreq/schedutil: Only bind threads if needed

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Message-ID: <20241001100150.ecefg4spoo2snv66@vireshk-i7>
Date: Tue, 1 Oct 2024 15:31:50 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Christian Loehle <christian.loehle@....com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Qais Yousef <qyousef@...alina.io>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Pierre Gondois <pierre.gondois@....com>
Subject: Re: [PATCHv2] cpufreq/schedutil: Only bind threads if needed

On 27-09-24, 09:59, Christian Loehle wrote:
> Remove the unconditional binding of sugov kthreads to the affected CPUs
> if the cpufreq driver indicates that updates can happen from any CPU.
> This allows userspace to set affinities to either save power (waking up
> bigger CPUs on HMP can be expensive) or increasing performance (by
> letting the utilized CPUs run without preemption of the sugov kthread).
> 
> Signed-off-by: Christian Loehle <christian.loehle@....com>
> ---
> - v2: Add comment for the dl_task_check_affinity return (Juri)
> v1: https://lore.kernel.org/lkml/480f2140-ea59-4e1d-a68d-18cbcec10941@arm.com/
> 
>  kernel/sched/cpufreq_schedutil.c | 6 +++++-
>  kernel/sched/syscalls.c          | 7 +++++++
>  2 files changed, 12 insertions(+), 1 deletion(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh