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From: Mel Gorman <mgorman@techsingularity.net>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>,
	Li Aubrey <aubrey.li@linux.intel.com>,
	Qais Yousef <qais.yousef@arm.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 3/4] sched/fair: Remove select_idle_smt()
Date: Mon, 25 Jan 2021 08:59:08 +0000	[thread overview]
Message-ID: <20210125085909.4600-4-mgorman@techsingularity.net> (raw)
In-Reply-To: <20210125085909.4600-1-mgorman@techsingularity.net>

From: Peter Zijlstra <peterz@infradead.org>

From: Peter Zijlstra (Intel) <peterz@infradead.org>

In order to make the next patch more readable, and to quantify the
actual effectiveness of this pass, start by removing it.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 kernel/sched/fair.c | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c8d8e185cf3b..fe587350ea14 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6101,27 +6101,6 @@ static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int
 	return -1;
 }
 
-/*
- * Scan the local SMT mask for idle CPUs.
- */
-static int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
-{
-	int cpu;
-
-	if (!static_branch_likely(&sched_smt_present))
-		return -1;
-
-	for_each_cpu(cpu, cpu_smt_mask(target)) {
-		if (!cpumask_test_cpu(cpu, p->cpus_ptr) ||
-		    !cpumask_test_cpu(cpu, sched_domain_span(sd)))
-			continue;
-		if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
-			return cpu;
-	}
-
-	return -1;
-}
-
 #else /* CONFIG_SCHED_SMT */
 
 static inline int select_idle_core(struct task_struct *p, struct sched_domain *sd, int target)
@@ -6129,11 +6108,6 @@ static inline int select_idle_core(struct task_struct *p, struct sched_domain *s
 	return -1;
 }
 
-static inline int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
-{
-	return -1;
-}
-
 #endif /* CONFIG_SCHED_SMT */
 
 /*
@@ -6323,10 +6297,6 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
 	if ((unsigned)i < nr_cpumask_bits)
 		return i;
 
-	i = select_idle_smt(p, sd, target);
-	if ((unsigned)i < nr_cpumask_bits)
-		return i;
-
 	return target;
 }
 
-- 
2.26.2


  parent reply	other threads:[~2021-01-26 20:39 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25  8:59 [PATCH v4 0/4] Scan for an idle sibling in a single pass Mel Gorman
2021-01-25  8:59 ` [PATCH 1/4] sched/fair: Remove SIS_AVG_CPU Mel Gorman
2021-01-25  8:59 ` [PATCH 2/4] sched/fair: Move avg_scan_cost calculations under SIS_PROP Mel Gorman
2021-01-27 10:39   ` Vincent Guittot
2021-01-25  8:59 ` Mel Gorman [this message]
2021-01-27 10:39   ` [PATCH 3/4] sched/fair: Remove select_idle_smt() Vincent Guittot
2021-02-17 13:17   ` [tip: sched/core] " tip-bot2 for Mel Gorman
2021-01-25  8:59 ` [PATCH 4/4] sched/fair: Merge select_idle_core/cpu() Mel Gorman
2021-01-27 10:43   ` Vincent Guittot
2021-01-27 12:02     ` Mel Gorman
2021-01-27 13:07       ` Vincent Guittot
2021-01-27 13:21         ` Mel Gorman
2021-01-27 13:26           ` Vincent Guittot
2021-01-27 13:51 [PATCH v5 0/4] Scan for an idle sibling in a single pass Mel Gorman
2021-01-27 13:52 ` [PATCH 3/4] sched/fair: Remove select_idle_smt() Mel Gorman

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