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From: K Prateek Nayak <kprateek.nayak@amd.com>
To: Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Frederic Weisbecker <frederic@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: <linux-kernel@vger.kernel.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	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>,
	"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
	Swapnil Sapkal <swapnil.sapkal@amd.com>,
	Shrikanth Hegde <sshegde@linux.ibm.com>,
	Chen Yu <yu.c.chen@intel.com>,
	"Yury Norov" <yury.norov@gmail.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>
Subject: [RESEND RFC PATCH v2 08/29] sched/fair: Use for_each_cpu_and_wrap() in select_idle_cpu()
Date: Mon, 8 Dec 2025 09:26:54 +0000	[thread overview]
Message-ID: <20251208092744.32737-8-kprateek.nayak@amd.com> (raw)
In-Reply-To: <20251208083602.31898-1-kprateek.nayak@amd.com>

Avoid the "cpumask_test() + continue" pattern for cluster cpumask
traversal in select_idle_cpu().

No functional changes intended.

Cc: Yury Norov <yury.norov@gmail.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
---
 kernel/sched/fair.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5abe0ccecef3..8f5745495974 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -7652,10 +7652,7 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, bool
 		struct sched_group *sg = sd->groups;
 
 		if (sg->flags & SD_CLUSTER) {
-			for_each_cpu_wrap(cpu, sched_group_span(sg), target + 1) {
-				if (!cpumask_test_cpu(cpu, cpus))
-					continue;
-
+			for_each_cpu_and_wrap(cpu, sched_group_span(sg), cpus, target + 1) {
 				if (has_idle_core) {
 					i = select_idle_core(p, cpu, cpus, &idle_cpu);
 					if ((unsigned int)i < nr_cpumask_bits)
-- 
2.43.0


  parent reply	other threads:[~2025-12-08  9:30 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-12-08  9:26 [RESEND RFC PATCH v2 00/29] sched/fair: Push-based load balancing K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 01/29] sched/fair: Simplify set_cpu_sd_state_*() with guards K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 02/29] sched/fair: Use rq->nohz_tick_stopped in update_nohz_stats() K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 03/29] sched/topology: Optimize sd->shared allocation and assignment K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 04/29] sched/fair: Simplify the entry condition for update_idle_cpu_scan() K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 05/29] sched/fair: Simplity SIS_UTIL handling in select_idle_cpu() K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 06/29] cpumask: Introduce for_each_cpu_and_wrap() and bitfield helpers K Prateek Nayak
2025-12-12 21:03   ` Yury Norov
2025-12-08  9:26 ` [RESEND RFC PATCH v2 07/29] sched/fair: Use for_each_cpu_and_wrap() in select_idle_capacity() K Prateek Nayak
2025-12-08  9:26 ` K Prateek Nayak [this message]
2025-12-08  9:26 ` [RESEND RFC PATCH v2 09/29] sched/fair: Rotate the CPU resposible for busy load balancing K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 10/29] sched/fair: Use xchg() to set sd->nohz_idle state K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 11/29] sched/topology: Attach new hierarchy in rq_attach_root() K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 12/29] sched/fair: Fixup sd->nohz_idle state during hotplug / cpuset K Prateek Nayak
2025-12-08  9:26 ` [RESEND RFC PATCH v2 13/29] sched/fair: Account idle cpus instead of busy cpus in sd->shared K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 14/29] sched/topology: Introduce fallback sd->shared assignment K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 15/29] sched/topology: Introduce percpu sd_nohz for nohz state tracking K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 16/29] sched/topology: Introduce "nohz_idle_cpus_mask" in sd->shared K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 17/29] sched/topology: Introduce "nohz_shared_list" to keep track of sd->shared K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 18/29] sched/fair: Reorder the barrier in nohz_balance_enter_idle() K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 19/29] sched/fair: Extract the main _nohz_idle_balance() loop into a helper K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 20/29] sched/fair: Convert find_new_ilb() to use nohz_shared_list K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 21/29] sched/fair: Introduce sched_asym_prefer_idle() for ILB kick K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 22/29] sched/fair: Convert sched_balance_nohz_idle() to use nohz_shared_list K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 23/29] sched/fair: Remove "nohz.idle_cpus_mask" K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 24/29] sched/fair: Optimize global "nohz.nr_cpus" tracking K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 25/29] sched/topology: Add basic debug information for "nohz_shared_list" K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 26/29] [EXPERIMENTAL] sched/fair: Add push task framework K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 27/29] [EXPERIMENTAL] sched/fair: Proactive idle balance using push mechanism K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 28/29] [EXPERIMENTAL] sched/fair: Add a local counter to rate limit task push K Prateek Nayak
2025-12-08 12:33   ` Christian Loehle
2025-12-08 17:35     ` K Prateek Nayak
2025-12-08  9:27 ` [RESEND RFC PATCH v2 29/29] [EXPERIMENTAL] sched/fair: Faster alternate for intra-NUMA newidle balance K Prateek Nayak
2025-12-08 14:04 ` [RESEND RFC PATCH v2 00/29] sched/fair: Push-based load balancing Shrikanth Hegde
2025-12-08 17:36   ` K Prateek Nayak

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