diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2023-05-31 13:58:42 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-07-19 09:43:58 +0200 |
| commit | 86bfbb7ce4f67a88df2639198169b685668e7349 (patch) | |
| tree | 43d0a9352919a405cae0586c7c38e8caca081f76 /kernel/sched/features.h | |
| parent | e0c2ff903c320d3fd3c2c604dc401b3b7c0a1d13 (diff) | |
sched/fair: Add lag based placement
With the introduction of avg_vruntime, it is possible to approximate
lag (the entire purpose of introducing it in fact). Use this to do lag
based placement over sleep+wake.
Specifically, the FAIR_SLEEPERS thing places things too far to the
left and messes up the deadline aspect of EEVDF.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230531124603.794929315@infradead.org
Diffstat (limited to 'kernel/sched/features.h')
| -rw-r--r-- | kernel/sched/features.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/sched/features.h b/kernel/sched/features.h index fa828b36533d..7958a10fe23b 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -1,12 +1,20 @@ /* SPDX-License-Identifier: GPL-2.0 */ + /* * Only give sleepers 50% of their service deficit. This allows * them to run sooner, but does not allow tons of sleepers to * rip the spread apart. */ +SCHED_FEAT(FAIR_SLEEPERS, false) SCHED_FEAT(GENTLE_FAIR_SLEEPERS, true) /* + * Using the avg_vruntime, do the right thing and preserve lag across + * sleep+wake cycles. EEVDF placement strategy #1, #2 if disabled. + */ +SCHED_FEAT(PLACE_LAG, true) + +/* * Prefer to schedule the task we woke last (assuming it failed * wakeup-preemption), since its likely going to consume data we * touched, increases cache locality. |