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: qyousef@layalina.io, chris.hyser@oracle.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,
kprateek.nayak@amd.com, yu.c.chen@intel.com,
youssefesmat@chromium.org, joel@joelfernandes.org,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v9 3/9] sched/core: Propagate parent task's latency requirements to the child task
Date: Tue, 15 Nov 2022 18:18:45 +0100 [thread overview]
Message-ID: <20221115171851.835-4-vincent.guittot@linaro.org> (raw)
In-Reply-To: <20221115171851.835-1-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 07ac08caf019..8c84c652853b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4592,6 +4592,7 @@ 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:[~2022-11-15 17:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-15 17:18 [PATCH v9 0/9] Add latency priority for CFS class Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 1/9] sched/fair: fix unfairness at wakeup Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 2/9] sched: Introduce latency-nice as a per-task attribute Vincent Guittot
2022-11-15 17:18 ` Vincent Guittot [this message]
2022-11-15 17:18 ` [PATCH v9 4/9] sched: Allow sched_{get,set}attr to change latency_nice of the task Vincent Guittot
2022-11-15 17:18 ` [PATCH 5/9] sched/fair: Take into account latency priority at wakeup Vincent Guittot
2022-11-29 4:25 ` Joel Fernandes
2022-11-29 8:58 ` Vincent Guittot
2022-11-29 15:45 ` Joel Fernandes
2022-11-29 17:20 ` Vincent Guittot
2022-11-30 3:09 ` Joel Fernandes
2022-11-30 13:42 ` Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 6/9] sched/fair: Add sched group latency support Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 7/9] sched/core: Support latency priority with sched core Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 8/9] sched/fair: Add latency list Vincent Guittot
2022-11-15 17:18 ` [PATCH v9 9/9] sched/fair: remove check_preempt_from_others Vincent Guittot
2022-11-28 11:51 ` [PATCH v9 0/9] Add latency priority for CFS class K Prateek Nayak
2022-11-28 17:19 ` Vincent Guittot
2022-12-07 16:26 ` K Prateek Nayak
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