[PATCH 4/5] sched/fair: Remove select_idle_smt()

Mel Gorman
2021-01-19T11:39:49Z

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 0811e2fe4f19..12e08da90024 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6103,27 +6103,6 @@ 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 */

#define sched_smt_weight 1
@@ -6133,11 +6112,6 @@ 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 */

#define sis_min_cores 2
@@ -6331,10 +6305,6 @@ 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