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| author | Barry Song <song.bao.hua@hisilicon.com> | 2023-10-19 06:33:21 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2023-10-24 11:38:42 +0300 |
| commit | b95303e0aeaf446b65169dd4142cacdaeb7d4c8b (patch) | |
| tree | 448ae9f3ea16e3d4593686bc929c059a8b8bd9f0 /kernel/sched/core.c | |
| parent | 5ebde09d91707a4a9bec1e3d213e3c12ffde348f (diff) | |
| download | linux-b95303e0aeaf446b65169dd4142cacdaeb7d4c8b.tar.xz | |
sched: Add cpus_share_resources API
Add cpus_share_resources() API. This is the preparation for the
optimization of select_idle_cpu() on platforms with cluster scheduler
level.
On a machine with clusters cpus_share_resources() will test whether
two cpus are within the same cluster. On a non-cluster machine it
will behaves the same as cpus_share_cache(). So we use "resources"
here for cache resources.
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-and-reviewed-by: Chen Yu <yu.c.chen@intel.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lkml.kernel.org/r/20231019033323.54147-2-yangyicong@huawei.com
Diffstat (limited to 'kernel/sched/core.c')
| -rw-r--r-- | kernel/sched/core.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index dc724f59e495..5e1fb8a63b2e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3939,6 +3939,18 @@ bool cpus_share_cache(int this_cpu, int that_cpu) return per_cpu(sd_llc_id, this_cpu) == per_cpu(sd_llc_id, that_cpu); } +/* + * Whether CPUs are share cache resources, which means LLC on non-cluster + * machines and LLC tag or L2 on machines with clusters. + */ +bool cpus_share_resources(int this_cpu, int that_cpu) +{ + if (this_cpu == that_cpu) + return true; + + return per_cpu(sd_share_id, this_cpu) == per_cpu(sd_share_id, that_cpu); +} + static inline bool ttwu_queue_cond(struct task_struct *p, int cpu) { /* |