diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2024-05-31 15:49:40 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2024-08-17 11:06:45 +0200 |
| commit | 82e9d0456e06cebe2c89f3c73cdbc9e3805e9437 (patch) | |
| tree | e13b9ee47e5d1ad45104110d714bbe52e3be612e /kernel/sched/features.h | |
| parent | fc1892becd5672f52329a75c73117b60ac7841b7 (diff) | |
sched/fair: Avoid re-setting virtual deadline on 'migrations'
During OSPM24 Youssef noted that migrations are re-setting the virtual
deadline. Notably everything that does a dequeue-enqueue, like setting
nice, changing preferred numa-node, and a myriad of other random crap,
will cause this to happen.
This shouldn't be. Preserve the relative virtual deadline across such
dequeue/enqueue cycles.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <vschneid@redhat.com>
Tested-by: Valentin Schneider <vschneid@redhat.com>
Link: https://lkml.kernel.org/r/20240727105030.625119246@infradead.org
Diffstat (limited to 'kernel/sched/features.h')
| -rw-r--r-- | kernel/sched/features.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 7fdeb5576188..caa4d7221d52 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -10,6 +10,10 @@ SCHED_FEAT(PLACE_LAG, true) */ SCHED_FEAT(PLACE_DEADLINE_INITIAL, true) /* + * Preserve relative virtual deadline on 'migration'. + */ +SCHED_FEAT(PLACE_REL_DEADLINE, true) +/* * Inhibit (wakeup) preemption until the current task has either matched the * 0-lag point or until is has exhausted it's slice. */ |