linux-kernel - [PATCH] sched: core: Optimize the structure of 'tg_cfs_schedulable

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Date:   Mon, 20 Mar 2023 04:02:55 +0800
From:   Li kunyu <kunyu@...china.com>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org, Li kunyu <kunyu@...china.com>
Subject: [PATCH] sched: core: Optimize the structure of 'tg_cfs_schedulable_down' function

Optimize if branches and define  in the branch statement
block　parent_quota variable.

Signed-off-by: Li kunyu <kunyu@...china.com>
---
 kernel/sched/core.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 488655f2319f..7e8535d2e36d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -10915,15 +10915,12 @@ static int tg_cfs_schedulable_down(struct task_group *tg, void *data)
 {
 	struct cfs_schedulable_data *d = data;
 	struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
-	s64 quota = 0, parent_quota = -1;
+	s64 quota = RUNTIME_INF;
 
-	if (!tg->parent) {
-		quota = RUNTIME_INF;
-	} else {
+	if (tg->parent) {
 		struct cfs_bandwidth *parent_b = &tg->parent->cfs_bandwidth;
-
+		s64 parent_quota = parent_b->hierarchical_quota;
 		quota = normalize_cfs_quota(tg, d);
-		parent_quota = parent_b->hierarchical_quota;
 
 		/*
 		 * Ensure max(child_quota) <= parent_quota.  On cgroup2,
-- 
2.18.2