[tip: sched/core] sched: Move update_curr_task logic into update_curr_se

[tip-bot2 for John Stultz]

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

Commit-ID:     865d8cfb1672089e4b628d6899ac5c6e49787150
Gitweb:        https://git.kernel.org/tip/865d8cfb1672089e4b628d6899ac5c6e49787150
Author:        John Stultz <jstultz@xxxxxxxxxx>
AuthorDate:    Sat, 12 Jul 2025 03:33:45 
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 14 Jul 2025 17:16:32 +02:00

sched: Move update_curr_task logic into update_curr_se

Absorb update_curr_task() into update_curr_se(), and
in the process simplify update_curr_common().

This will make the next step a bit easier.

Signed-off-by: John Stultz <jstultz@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Link: https://lkml.kernel.org/r/20250712033407.2383110-5-jstultz@xxxxxxxxxx
---
 kernel/sched/fair.c | 26 +++++++++-----------------
 1 file changed, 9 insertions(+), 17 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b9b4bbb..8334580 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1164,6 +1164,14 @@ static s64 update_curr_se(struct rq *rq, struct sched_entity *curr)
 	curr->exec_start = now;
 	curr->sum_exec_runtime += delta_exec;
 
+	if (entity_is_task(curr)) {
+		struct task_struct *p = task_of(curr);
+
+		trace_sched_stat_runtime(p, delta_exec);
+		account_group_exec_runtime(p, delta_exec);
+		cgroup_account_cputime(p, delta_exec);
+	}
+
 	if (schedstat_enabled()) {
 		struct sched_statistics *stats;
 
@@ -1175,26 +1183,14 @@ static s64 update_curr_se(struct rq *rq, struct sched_entity *curr)
 	return delta_exec;
 }
 
-static inline void update_curr_task(struct task_struct *p, s64 delta_exec)
-{
-	trace_sched_stat_runtime(p, delta_exec);
-	account_group_exec_runtime(p, delta_exec);
-	cgroup_account_cputime(p, delta_exec);
-}
-
 /*
  * Used by other classes to account runtime.
  */
 s64 update_curr_common(struct rq *rq)
 {
 	struct task_struct *donor = rq->donor;
-	s64 delta_exec;
 
-	delta_exec = update_curr_se(rq, &donor->se);
-	if (likely(delta_exec > 0))
-		update_curr_task(donor, delta_exec);
-
-	return delta_exec;
+	return update_curr_se(rq, &donor->se);
 }
 
 /*
@@ -1219,10 +1215,6 @@ static void update_curr(struct cfs_rq *cfs_rq)
 	update_min_vruntime(cfs_rq);
 
 	if (entity_is_task(curr)) {
-		struct task_struct *p = task_of(curr);
-
-		update_curr_task(p, delta_exec);
-
 		/*
 		 * If the fair_server is active, we need to account for the
 		 * fair_server time whether or not the task is running on