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sched_ext: Improve SCX_KF_DISPATCH comment

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The comment for SCX_KF_DISPATCH was incomplete and didn't explain that
ops.dispatch() may temporarily release the rq lock, allowing ENQUEUE and
SELECT_CPU operations to be nested inside DISPATCH contexts.

Update the comment to clarify this nesting behavior and provide better
context for when these operations can occur within dispatch.

Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2025-09-23 09:03:26 -10:00
parent c8191ee8e6
commit edf005fa27
1 changed files with 5 additions and 1 deletions
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6
include/linux/sched/ext.h
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@ -108,7 +108,11 @@ enum scx_kf_mask {
SCX_KF_UNLOCKED = 0, /* sleepable and not rq locked */
/* ENQUEUE and DISPATCH may be nested inside CPU_RELEASE */
SCX_KF_CPU_RELEASE = 1 << 0, /* ops.cpu_release() */
/* ops.dequeue (in REST) may be nested inside DISPATCH */
/*
* ops.dispatch() may release rq lock temporarily and thus ENQUEUE and
* SELECT_CPU may be nested inside. ops.dequeue (in REST) may also be
* nested inside DISPATCH.
*/
SCX_KF_DISPATCH = 1 << 1, /* ops.dispatch() */
SCX_KF_ENQUEUE = 1 << 2, /* ops.enqueue() and ops.select_cpu() */
SCX_KF_SELECT_CPU = 1 << 3, /* ops.select_cpu() */