linux-kernel - [PATCH v12 7/8] sched/core: Support latency priority with sched core

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Date:   Fri, 24 Feb 2023 10:34:53 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
        mgorman@...e.de, bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org, parth@...ux.ibm.com, tj@...nel.org,
        lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, corbet@....net, linux-doc@...r.kernel.org
Cc:     qyousef@...alina.io, chris.hyser@...cle.com,
        patrick.bellasi@...bug.net, David.Laight@...lab.com,
        pjt@...gle.com, pavel@....cz, qperret@...gle.com,
        tim.c.chen@...ux.intel.com, joshdon@...gle.com, timj@....org,
        kprateek.nayak@....com, yu.c.chen@...el.com,
        youssefesmat@...omium.org, joel@...lfernandes.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v12 7/8] sched/core: Support latency priority with sched core

Take into account wakeup_latency_gran() when ordering the cfs threads.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Tested-by: K Prateek Nayak <kprateek.nayak@....com>
---
 kernel/sched/fair.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index dc7570f43ebe..125a6ff53378 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -11949,6 +11949,9 @@ bool cfs_prio_less(const struct task_struct *a, const struct task_struct *b,
 	delta = (s64)(sea->vruntime - seb->vruntime) +
 		(s64)(cfs_rqb->min_vruntime_fi - cfs_rqa->min_vruntime_fi);
 
+	/* Take into account latency offset */
+	delta -= wakeup_latency_gran(sea, seb);
+
 	return delta > 0;
 }
 #else
-- 
2.34.1