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sched/fair: Small cleanup to update_newidle_cost()

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JIRA: https://issues.redhat.com/browse/RHEL-147187

commit 08d473dd8718e4a4d698b1113a14a40ad64a909b
Author: Peter Zijlstra <peterz@infradead.org>
Date:   Fri Nov 7 17:01:27 2025 +0100

    sched/fair: Small cleanup to update_newidle_cost()

    Simplify code by adding a few variables.

    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
    Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
    Tested-by: Chris Mason <clm@meta.com>
    Link: https://patch.msgid.link/20251107161739.655208666@infradead.org

(cherry picked from commit 08d473dd8718e4a4d698b1113a14a40ad64a909b)
Assisted-by: Patchpal
Signed-off-by: Herton R. Krzesinski <herton@redhat.com>
This commit is contained in:
Herton R. Krzesinski
2026-03-10 11:43:35 -03:00
parent 30b5472709
commit 113ada785e
1 changed files with 7 additions and 4 deletions
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kernel/sched/fair.c
+7 -4
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@@ -11686,22 +11686,25 @@ void update_max_interval(void)
static inline bool update_newidle_cost(struct sched_domain *sd, u64 cost)
{
unsigned long next_decay = sd->last_decay_max_lb_cost + HZ;
unsigned long now = jiffies;
if (cost > sd->max_newidle_lb_cost) {
/*
* Track max cost of a domain to make sure to not delay the
* next wakeup on the CPU.
*/
sd->max_newidle_lb_cost = cost;
sd->last_decay_max_lb_cost = jiffies;
} else if (time_after(jiffies, sd->last_decay_max_lb_cost + HZ)) {
sd->last_decay_max_lb_cost = now;
} else if (time_after(now, next_decay)) {
/*
* Decay the newidle max times by ~1% per second to ensure that
* it is not outdated and the current max cost is actually
* shorter.
*/
sd->max_newidle_lb_cost = (sd->max_newidle_lb_cost * 253) / 256;
sd->last_decay_max_lb_cost = jiffies;
sd->last_decay_max_lb_cost = now;
return true;
}