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| author |   Abel Wu <wuyun.abel@bytedance.com> | 2022-09-07 19:19:56 +0800 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2022-09-07 21:53:46 +0200 |
| commit | 3e6efe87cd5ccabf0f1d4e3ef25881ca0fd337e7 (patch) | |
| tree | 94f321aeaa8b48861875c8d44dad301e5e481d6c /kernel/sched/fair.c | |
| parent | sched/deadline: Move __dl_clear_params out of dl_bw lock (diff) | |
| download | linux-dev-3e6efe87cd5ccabf0f1d4e3ef25881ca0fd337e7.tar.xz linux-dev-3e6efe87cd5ccabf0f1d4e3ef25881ca0fd337e7.zip | |
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@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Don <joshdon@google.com>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Link: https://lore.kernel.org/r/20220907112000.1854-2-wuyun.abel@bytedance.com
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/fair.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index efceb670e755..9657c7de5f57 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6350,14 +6350,11 @@ 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; } @@ -6381,7 +6378,7 @@ 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; } @@ -6615,7 +6612,7 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target) has_idle_core = test_idle_cores(target, false); 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; } |