Re: [PATCH 4/4] sched/fair: Rework/fix task_h_load()

[Peter Zijlstra <peterz@infradead.org>]

On Wed, Sep 02, 2026 at 10:13:01AM +0200, Peter Zijlstra wrote:

> Let me go and try and reproduce.

Different physical machine.. *splat*, virtual machine it lives. Argh I
hate computers.

Anyway, confirmed on physical machine that triggered it, the blow seems
to cure things. I'll fold it in.

---
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -15287,9 +15287,6 @@ static void set_next_task_fair(struct rq
 			weight = __calc_prop_weight(cfs_rq, se, weight);
 	}
 
-	for_each_sched_entity_bl(se, cfs_rq)
-		update_cfs_rq_h_load(group_cfs_rq(se), se, cfs_rq);
-
 	if (throttled)
 		task_throttle_setup_work(p);
 
@@ -15309,11 +15306,15 @@ static void set_next_task_fair(struct rq
 		 */
 		list_move(&se->group_node, &rq->cfs_tasks);
 	}
-	if (!first)
-		return;
 
 	WARN_ON_ONCE(se->sched_delayed);
 
+	for_each_sched_entity_bl(se, cfs_rq)
+		update_cfs_rq_h_load(group_cfs_rq(se), se, cfs_rq);
+
+	if (!first)
+		return;
+
 	if (hrtick_enabled_fair(rq))
 		hrtick_start_fair(rq, p);