linux-kernel - [tip: sched/core] sched/fair: Propagate enqueue flags into place

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Date:   Thu, 10 Aug 2023 07:10:52 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: Propagate enqueue flags into place_entity()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     d07f09a1f99cabbc86bc5c97d962eb8a466106b5
Gitweb:        https://git.kernel.org/tip/d07f09a1f99cabbc86bc5c97d962eb8a466106b5
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Wed, 31 May 2023 13:58:49 +02:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 19 Jul 2023 09:43:59 +02:00

sched/fair: Propagate enqueue flags into place_entity()

This allows place_entity() to consider ENQUEUE_WAKEUP and
ENQUEUE_MIGRATED.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20230531124604.274010996@infradead.org
---
 kernel/sched/fair.c  | 10 +++++-----
 kernel/sched/sched.h |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 61747a2..5c8c9f7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4909,7 +4909,7 @@ static inline void update_misfit_status(struct task_struct *p, struct rq *rq) {}
 #endif /* CONFIG_SMP */
 
 static void
-place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
+place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 {
 	u64 vslice = calc_delta_fair(se->slice, se);
 	u64 vruntime = avg_vruntime(cfs_rq);
@@ -4998,7 +4998,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
 	 * on average, halfway through their slice, as such start tasks
 	 * off with half a slice to ease into the competition.
 	 */
-	if (sched_feat(PLACE_DEADLINE_INITIAL) && initial)
+	if (sched_feat(PLACE_DEADLINE_INITIAL) && (flags & ENQUEUE_INITIAL))
 		vslice /= 2;
 
 	/*
@@ -5022,7 +5022,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	 * update_curr().
 	 */
 	if (curr)
-		place_entity(cfs_rq, se, 0);
+		place_entity(cfs_rq, se, flags);
 
 	update_curr(cfs_rq);
 
@@ -5049,7 +5049,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 	 * we can place the entity.
 	 */
 	if (!curr)
-		place_entity(cfs_rq, se, 0);
+		place_entity(cfs_rq, se, flags);
 
 	account_entity_enqueue(cfs_rq, se);
 
@@ -12280,7 +12280,7 @@ static void task_fork_fair(struct task_struct *p)
 	curr = cfs_rq->curr;
 	if (curr)
 		update_curr(cfs_rq);
-	place_entity(cfs_rq, se, 1);
+	place_entity(cfs_rq, se, ENQUEUE_INITIAL);
 	rq_unlock(rq, &rf);
 }
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 7ff9965..db58537 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2199,6 +2199,7 @@ extern const u32		sched_prio_to_wmult[40];
 #else
 #define ENQUEUE_MIGRATED	0x00
 #endif
+#define ENQUEUE_INITIAL		0x80
 
 #define RETRY_TASK		((void *)-1UL)