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Message-Id: <20220712082036.5130-4-wuyun.abel@bytedance.com>
Date: Tue, 12 Jul 2022 16:20:34 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Peter Zijlstra <peterz@...radead.org>,
Mel Gorman <mgorman@...e.de>,
Vincent Guittot <vincent.guittot@...aro.org>
Cc: Josh Don <joshdon@...gle.com>, Chen Yu <yu.c.chen@...el.com>,
linux-kernel@...r.kernel.org, Abel Wu <wuyun.abel@...edance.com>
Subject: [PATCH 3/5] sched/fair: remove redundant check in select_idle_smt
If two cpus share LLC cache, then the two cores they belong to
are also in the same LLC domain.
Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
Reviewed-by: Josh Don <joshdon@...gle.com>
---
kernel/sched/fair.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c72093f282ec..0d7e8555bcf9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6339,14 +6339,11 @@ static int select_idle_core(struct task_struct *p, int core, struct cpumask *cpu
/*
* Scan the local SMT mask for idle CPUs.
*/
-static int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
+static int select_idle_smt(struct task_struct *p, int target)
{
int cpu;
- 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;
+ for_each_cpu_and(cpu, cpu_smt_mask(target), p->cpus_ptr) {
if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
return cpu;
}
@@ -6370,7 +6367,7 @@ static inline int select_idle_core(struct task_struct *p, int core, struct cpuma
return __select_idle_cpu(core, p);
}
-static inline int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
+static inline int select_idle_smt(struct task_struct *p, int target)
{
return -1;
}
@@ -6607,7 +6604,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
has_idle_core = test_idle_cores(target);
if (!has_idle_core && cpus_share_cache(prev, target)) {
- i = select_idle_smt(p, sd, prev);
+ i = select_idle_smt(p, prev);
if ((unsigned int)i < nr_cpumask_bits)
return i;
}
--
2.31.1
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