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sched/core: Mark wakeups completed through ttwu_runnable()

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ttwu_runnable() completes a wakeup for a task which remains queued
without calling activate_task() or its scheduling-class enqueue
callback. Scheduling classes currently cannot distinguish this path
from wakeups which performed a full activation.

Add WF_TTWU_RQ to identify wakeups completed through ttwu_runnable().
A later sched_ext change uses it to reconsider retained proxy donors
which wake without another ops.enqueue() call.

No functional change.

Signed-off-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260922165445.943315-4-arighi@nvidia.com
This commit is contained in:
Andrea Righi 2026-09-22 18:51:42 +02:00 committed by Peter Zijlstra
parent 8f8c0417e9
commit a49653d0ab
2 changed files with 2 additions and 1 deletions
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2
kernel/sched/core.c
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@ -3919,7 +3919,7 @@ static int ttwu_runnable(struct task_struct *p, int wake_flags)
* When on_rq && !on_cpu the task is preempted, see if
* it should preempt the task that is current now.
*/
wakeup_preempt(rq, p, wake_flags);
wakeup_preempt(rq, p, wake_flags | WF_TTWU_RQ);
}
ttwu_do_wakeup(p);
return 1;

1
kernel/sched/sched.h
View File

@ -2545,6 +2545,7 @@ static inline int task_on_rq_migrating(struct task_struct *p)
#define WF_MIGRATED 0x20 /* Internal use, task got migrated */
#define WF_CURRENT_CPU 0x40 /* Prefer to move the wakee to the current CPU. */
#define WF_RQ_SELECTED 0x80 /* ->select_task_rq() was called */
#define WF_TTWU_RQ 0x100 /* Wakeup completed through ttwu_runnable() */
static_assert(WF_EXEC == SD_BALANCE_EXEC);
static_assert(WF_FORK == SD_BALANCE_FORK);