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
Cc: qais.yousef@arm.com, chris.hyser@oracle.com,
valentin.schneider@arm.com, patrick.bellasi@matbug.net,
David.Laight@aculab.com, pjt@google.com, pavel@ucw.cz,
tj@kernel.org, qperret@google.com, tim.c.chen@linux.intel.com,
joshdon@google.com, timj@gnu.org,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v5 2/7] sched/core: Propagate parent task's latency requirements to the child task
Date: Sun, 25 Sep 2022 16:39:03 +0200 [thread overview]
Message-ID: <20220925143908.10846-3-vincent.guittot@linaro.org> (raw)
In-Reply-To: <20220925143908.10846-1-vincent.guittot@linaro.org>
From: Parth Shah <parth@linux.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@linux.ibm.com>
[rebase]
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
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 4fa4a3ddb4f4..ada2d05bd894 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4559,6 +4559,7 @@ 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:
--
2.17.1
next prev parent reply other threads:[~2022-09-25 14:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-25 14:39 [PATCH v5 0/7] Add latency priority for CFS class Vincent Guittot
2022-09-25 14:39 ` [PATCH v5 1/7] sched: Introduce latency-nice as a per-task attribute Vincent Guittot
2022-09-25 14:39 ` Vincent Guittot [this message]
2022-09-25 14:39 ` [PATCH v5 3/7] sched: Allow sched_{get,set}attr to change latency_nice of the task Vincent Guittot
2022-10-12 15:07 ` K Prateek Nayak
2022-10-12 15:44 ` Vincent Guittot
2022-09-25 14:39 ` [PATCH v5 4/7] sched/fair: Take into account latency priority at wakeup Vincent Guittot
2022-10-22 15:08 ` Chen Yu
2022-10-24 22:36 ` Vincent Guittot
2022-09-25 14:39 ` [PATCH v5 5/7] sched/fair: Add sched group latency support Vincent Guittot
2022-10-12 14:22 ` Qais Yousef
2022-10-12 15:42 ` Vincent Guittot
2022-10-12 16:07 ` Qais Yousef
2022-09-25 14:39 ` [PATCH v5 6/7] sched/core: Support latency priority with sched core Vincent Guittot
2022-09-25 14:39 ` [PATCH v5 7/7] sched/fair: Add latency list Vincent Guittot
2022-10-08 1:04 ` Youssef Esmat
2022-10-08 21:14 ` David Laight
2022-10-08 21:59 ` Steven Rostedt
2022-10-11 17:10 ` Vincent Guittot
2022-10-11 23:54 ` Youssef Esmat
2022-10-12 15:21 ` Vincent Guittot
2022-10-13 17:19 ` Youssef Esmat
2022-10-14 15:22 ` Vincent Guittot
2022-10-19 16:53 ` Vincent Guittot
2022-10-20 15:20 ` Vincent Guittot
2022-10-26 10:44 ` Dietmar Eggemann
2022-10-26 13:55 ` Vincent Guittot
2022-10-12 14:53 ` [PATCH v5 0/7] Add latency priority for CFS class K Prateek Nayak
2022-10-13 15:24 ` Vincent Guittot
2022-10-17 6:47 ` K Prateek Nayak
2022-10-25 6:36 ` K Prateek Nayak
2022-10-27 16:34 ` Vincent Guittot
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