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Message-Id: <20230223191041.577305-4-vincent.guittot@linaro.org>
Date: Thu, 23 Feb 2023 20:10:36 +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,
lizefan.x@...edance.com, hannes@...xchg.org,
cgroups@...r.kernel.org, corbet@....net, linux-doc@...r.kernel.org
Cc: tj@...nel.org, 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 v11 3/8] sched/core: Propagate parent task's latency requirements to the child task
From: Parth Shah <parth@...ux.ibm.com>
Clone parent task's latency_nice attribute to the forked child task.
Reset the latency_nice value to default value when the child task is
set to sched_reset_on_fork.
Also, initialize init_task.latency_nice value with DEFAULT_LATENCY_NICE
value
Signed-off-by: Parth Shah <parth@...ux.ibm.com>
[rebase]
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Tested-by: K Prateek Nayak <kprateek.nayak@....com>
---
init/init_task.c | 1 +
kernel/sched/core.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/init/init_task.c b/init/init_task.c
index ff6c4b9bfe6b..7dd71dd2d261 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -78,6 +78,7 @@ struct task_struct init_task
.prio = MAX_PRIO - 20,
.static_prio = MAX_PRIO - 20,
.normal_prio = MAX_PRIO - 20,
+ .latency_nice = DEFAULT_LATENCY_NICE,
.policy = SCHED_NORMAL,
.cpus_ptr = &init_task.cpus_mask,
.user_cpus_ptr = NULL,
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4580fe3e1d0c..28b397f9698b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4681,6 +4681,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
p->prio = p->normal_prio = p->static_prio;
set_load_weight(p, false);
+ p->latency_nice = DEFAULT_LATENCY_NICE;
/*
* We don't need the reset flag anymore after the fork. It has
* fulfilled its duty:
--
2.34.1
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