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sched/core: Optimize core cookie matching check

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Early return true if the core cookie matches. This avoids the SMT mask
loop to check for an idle core, which might be more expensive on wide
platforms.

Signed-off-by: Fernand Sieber <sieberf@amazon.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Reviewed-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Link: https://patch.msgid.link/20251105152538.470586-1-sieberf@amazon.com
This commit is contained in:
Fernand Sieber 2025-11-05 17:25:37 +02:00 committed by Peter Zijlstra
parent 127b90315c
commit 7f829bde94
1 changed files with 4 additions and 1 deletions
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5
kernel/sched/sched.h
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@ -1432,6 +1432,9 @@ static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
if (!sched_core_enabled(rq))
return true;
if (rq->core->core_cookie == p->core_cookie)
return true;
for_each_cpu(cpu, cpu_smt_mask(cpu_of(rq))) {
if (!available_idle_cpu(cpu)) {
idle_core = false;
@ -1443,7 +1446,7 @@ static inline bool sched_core_cookie_match(struct rq *rq, struct task_struct *p)
* A CPU in an idle core is always the best choice for tasks with
* cookies.
*/
return idle_core || rq->core->core_cookie == p->core_cookie;
return idle_core;
}
static inline bool sched_group_cookie_match(struct rq *rq,