From:   Vincent Guittot <vincent.guittot@linaro.org>
To:     mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
        dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com,
        mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com,
        linux-kernel@vger.kernel.org, parth@linux.ibm.com, tj@kernel.org,
        lizefan.x@bytedance.com, hannes@cmpxchg.org,
        cgroups@vger.kernel.org, corbet@lwn.net, linux-doc@vger.kernel.org
Cc:     qyousef@layalina.io, chris.hyser@oracle.com,
        patrick.bellasi@matbug.net, David.Laight@aculab.com,
        pjt@google.com, pavel@ucw.cz, qperret@google.com,
        tim.c.chen@linux.intel.com, joshdon@google.com, timj@gnu.org,
        kprateek.nayak@amd.com, yu.c.chen@intel.com,
        youssefesmat@chromium.org, joel@joelfernandes.org,
        Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v12 7/8] sched/core: Support latency priority with sched core
Date:   Fri, 24 Feb 2023 10:34:53 +0100
Message-Id: <20230224093454.956298-8-vincent.guittot@linaro.org>
In-Reply-To: <20230224093454.956298-1-vincent.guittot@linaro.org>
References: <20230224093454.956298-1-vincent.guittot@linaro.org>
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Take into account wakeup_latency_gran() when ordering the cfs threads.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.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