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authorPat Somaru <patso@likewhatevs.io>2024-09-20 15:41:59 -0400
committerTejun Heo <tj@kernel.org>2024-09-23 05:40:53 -1000
commitedf1c586e92675c4e0eb27758fcdb55a56838de1 (patch)
treee981b9657b28e02d4209b83fb0dc25f8395ce44f /kernel/sched
parent7ebd84d627e40cb9fb12b338588e81b6cca371e3 (diff)
sched, sched_ext: Disable SM_IDLE/rq empty path when scx_enabled()
Disable the rq empty path when scx is enabled. SCX must consult the BPF scheduler (via the dispatch path in balance) to determine if rq is empty. This fixes stalls when scx is enabled. Signed-off-by: Pat Somaru <patso@likewhatevs.io> Fixes: 3dcac251b066 ("sched/core: Introduce SM_IDLE and an idle re-entry fast-path in __schedule()") Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/core.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index b6cc1cf499d6..43e453ab7e20 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6591,7 +6591,8 @@ static void __sched notrace __schedule(int sched_mode)
*/
prev_state = READ_ONCE(prev->__state);
if (sched_mode == SM_IDLE) {
- if (!rq->nr_running) {
+ /* SCX must consult the BPF scheduler to tell if rq is empty */
+ if (!rq->nr_running && !scx_enabled()) {
next = prev;
goto picked;
}