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sched/fair: Remove select_idle_smt()

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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: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210125085909.4600-4-mgorman@techsingularity.net
This commit is contained in:
Mel Gorman 2021-01-25 08:59:08 +00:00 • committed by Ingo Molnar
parent ed3cd45f8c
commit 6cd56ef1df
1 changed files with 0 additions and 30 deletions
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30
kernel/sched/fair.c
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@ -6114,27 +6114,6 @@ static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int
return -1; 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 */ #else /* CONFIG_SCHED_SMT */
static inline int select_idle_core(struct task_struct *p, struct sched_domain *sd, int target) static inline int select_idle_core(struct task_struct *p, struct sched_domain *sd, int target)
@ -6142,11 +6121,6 @@ static inline int select_idle_core(struct task_struct *p, struct sched_domain *s
return -1; return -1;
} }
static inline int select_idle_smt(struct task_struct *p, struct sched_domain *sd, int target)
{
return -1;
}
#endif /* CONFIG_SCHED_SMT */ #endif /* CONFIG_SCHED_SMT */
/* /*
@ -6336,10 +6310,6 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
if ((unsigned)i < nr_cpumask_bits) if ((unsigned)i < nr_cpumask_bits)
return i; return i;
i = select_idle_smt(p, sd, target);
if ((unsigned)i < nr_cpumask_bits)
return i;
return target; return target;
} }