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From: Andrea Righi <arighi@nvidia.com>
To: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Christian Loehle <christian.loehle@arm.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	Phil Auld <pauld@redhat.com>, Breno Leitao <leitao@debian.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection
Date: Sat, 12 Sep 2026 00:34:35 +0200	[thread overview]
Message-ID: <aqSB-zn9_ji_Ekc8@gpd4> (raw)
In-Reply-To: <1529268b-8e10-4fef-be6e-60b6dd1e74a0@arm.com>

On Fri, Sep 11, 2026 at 04:11:38PM +0200, Dietmar Eggemann wrote:
> On 09.09.26 08:26, Andrea Righi wrote:
> 
> [...]
> 
> > +static bool has_asym_smt_domain(int cpu)
> > +{
> > +	struct sched_domain *sd;
> > +
> > +	for_each_domain(cpu, sd) {
> > +		if (!(sd->flags & SD_SHARE_CPUCAPACITY))
> > +			break;
> > +
> > +		if (sd->flags & SD_ASYM_PACKING)
> > +			return true;
> > +	}
> > +
> > +	return false;
> > +}
> 
> Replace for_each_domain() w/ sd = rcu_dereference_all(cpu_rq(cpu)->sd)
> here as well?

Correct, I've changed it locally already to inspect the lowest scheduling domain
directly.

Thanks,
-Andrea

  reply	other threads:[~2026-09-11 22:34 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-09  6:26 [PATCH v5 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus Andrea Righi
2026-09-09  6:26 ` [PATCH 1/2] arm64: topology: Prefer PE0 on NVIDIA Olympus SMT cores Andrea Righi
2026-09-09 15:19   ` Dietmar Eggemann
2026-09-09 16:17     ` Andrea Righi
2026-09-10 10:11       ` Dietmar Eggemann
2026-09-11  9:11         ` Andrea Righi
2026-09-11 14:15           ` Dietmar Eggemann
2026-09-09 15:34   ` Will Deacon
2026-09-09 16:07     ` Andrea Righi
2026-09-10  8:53       ` Will Deacon
2026-09-11  6:50         ` Andrea Righi
2026-09-09  6:26 ` [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection Andrea Righi
2026-09-11 14:11   ` Dietmar Eggemann
2026-09-11 22:34     ` Andrea Righi [this message]
2026-09-09  6:36 ` [PATCH v5 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus K Prateek Nayak
2026-09-09  6:41   ` Andrea Righi
2026-09-09 13:14 ` Peter Zijlstra
2026-09-09 15:36   ` Will Deacon
2026-09-09 21:51     ` Peter Zijlstra
  -- strict thread matches above, loose matches on Subject: below --
2026-09-08  8:23 [PATCH v4 " Andrea Righi
2026-09-08  8:23 ` [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection Andrea Righi
2026-09-08 19:40   ` K Prateek Nayak
2026-09-08 20:49     ` Andrea Righi
2026-09-09  6:32       ` K Prateek Nayak
2026-09-09 14:42   ` Vincent Guittot
2026-09-09 15:18     ` Andrea Righi
2026-09-09 15:42       ` Vincent Guittot
2026-09-09 16:22         ` Andrea Righi
2026-09-07 16:30 [PATCH v3 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus Andrea Righi
2026-09-07 16:30 ` [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection Andrea Righi
2026-09-04  9:18 [PATCH v2 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus Andrea Righi
2026-09-04  9:18 ` [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection Andrea Righi
2026-09-07  3:57   ` K Prateek Nayak
2026-09-07  9:11     ` Andrea Righi
2026-09-07  9:40       ` K Prateek Nayak
2026-09-07  9:50         ` Andrea Righi
2026-09-07 16:48     ` Shrikanth Hegde
2026-09-08  5:37   ` Srikar Dronamraju
2026-09-08  6:12     ` Andrea Righi
2026-08-31 18:10 [PATCH 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus Andrea Righi
2026-08-31 18:10 ` [PATCH 2/2] sched/fair: Honor asymmetric SMT priority in idle selection Andrea Righi
2026-09-03 10:59   ` Dietmar Eggemann
2026-09-04  5:59     ` Andrea Righi

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