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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>,
	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>,
	Christian Loehle <christian.loehle@arm.com>,
	Koba Ko <kobak@nvidia.com>,
	Felix Abecassis <fabecassis@nvidia.com>,
	Balbir Singh <balbirs@nvidia.com>,
	Joel Fernandes <joelagnelf@nvidia.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] sched/fair: Drop redundant RCU read lock in NOHZ kick path
Date: Tue, 5 May 2026 11:22:06 +0200	[thread overview]
Message-ID: <afm2vuTvUEsKe-4T@gpd4> (raw)
In-Reply-To: <4b4aadb2-a159-4ed9-852e-8aeb53d798ab@arm.com>

Hi Dietmar,

On Tue, May 05, 2026 at 11:15:12AM +0200, Dietmar Eggemann wrote:
> On 28.04.26 16:41, Andrea Righi wrote:
> 
> [...]
> 
> > @@ -12799,10 +12795,10 @@ static void nohz_balancer_kick(struct rq *rq)
> >  		 *
> >  		 * Skip the LLC logic because it's not relevant in that case.
> >  		 */
> > -		goto unlock;
> > +		goto out;
> >  	}
> >  
> > -	sds = rcu_dereference_all(per_cpu(sd_llc_shared, cpu));
> > +	sds = rcu_dereference_all(per_cpu(sd_balance_shared, cpu));
> 
> nit: sd_balance_shared is only defined in 2/5.

Ah, good catch! Apparently I forgot to test-build each individual patch, I'll
fix this.

Thanks,
-Andrea

  reply	other threads:[~2026-05-05  9:22 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-28 14:41 [PATCH v5 0/5] sched/fair: SMT-aware asymmetric CPU capacity Andrea Righi
2026-04-28 14:41 ` [PATCH 1/5] sched/fair: Drop redundant RCU read lock in NOHZ kick path Andrea Righi
2026-04-28 16:29   ` K Prateek Nayak
2026-04-29 16:07     ` [PATCH v2 " Andrea Righi
2026-05-05  9:15   ` [PATCH " Dietmar Eggemann
2026-05-05  9:22     ` Andrea Righi [this message]
2026-04-28 14:41 ` [PATCH 2/5] sched/fair: Attach sched_domain_shared to sd_asym_cpucapacity Andrea Righi
2026-05-05 12:48   ` Dietmar Eggemann
2026-05-06  9:45   ` Vincent Guittot
2026-05-06 10:19     ` K Prateek Nayak
2026-05-06 10:30       ` Vincent Guittot
2026-04-28 14:41 ` [PATCH 3/5] sched/fair: Prefer fully-idle SMT cores in asym-capacity idle selection Andrea Righi
2026-05-05 17:20   ` Dietmar Eggemann
2026-05-06 18:31     ` Andrea Righi
2026-05-06 10:29   ` Vincent Guittot
2026-05-06 12:34     ` Vincent Guittot
2026-05-06 18:15     ` Andrea Righi
2026-04-28 14:41 ` [PATCH 4/5] sched/fair: Reject misfit pulls onto busy SMT siblings on asym-capacity Andrea Righi
2026-04-28 14:41 ` [PATCH 5/5] sched/fair: Add SIS_UTIL support to select_idle_capacity() Andrea Righi
2026-05-06 12:59   ` Vincent Guittot
2026-05-06 17:01     ` Dietmar Eggemann
2026-05-06 18:11       ` Andrea Righi
2026-05-07  6:47         ` Vincent Guittot
2026-05-08 14:49           ` Dietmar Eggemann
2026-05-08 22:05             ` Andrea Righi
2026-05-05 20:40 ` [PATCH v5 0/5] sched/fair: SMT-aware asymmetric CPU capacity Dietmar Eggemann
  -- strict thread matches above, loose matches on Subject: below --
2026-05-09 18:01 Andrea Righi
2026-05-09 18:01 ` [PATCH 1/5] sched/fair: Drop redundant RCU read lock in NOHZ kick path Andrea Righi
2026-05-09 18:07 [PATCH v6 0/5 RESEND] sched/fair: SMT-aware asymmetric CPU capacity Andrea Righi
2026-05-09 18:07 ` [PATCH 1/5] sched/fair: Drop redundant RCU read lock in NOHZ kick path Andrea Righi
2026-05-11 13:04   ` Vincent Guittot
2026-05-15  6:49   ` Shrikanth Hegde
2026-05-16  5:45     ` Andrea Righi
2026-05-16 17:15       ` Shrikanth Hegde
2026-05-21 19:47   ` Marek Szyprowski
2026-05-21 20:13     ` Andrea Righi

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