From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>,
Qais Yousef <qais.yousef@arm.com>, Scott Wood <swood@redhat.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
Vincent Donnefort <vincent.donnefort@arm.com>
Subject: [patch 08/10] sched: Add update_migratory() callback to scheduler classes
Date: Thu, 17 Sep 2020 11:42:10 +0200 [thread overview]
Message-ID: <20200917101624.708629719@linutronix.de> (raw)
In-Reply-To: 20200917094202.301694311@linutronix.de
Provide a mechanism to update the number or migratory tasks in the RT and
deadline scheduler classes.
This will be used by the upcoming migrate_disable/enable() functionality on
RT kernels.
Originally-by: Daniel Bristot de Oliveira <bristot@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
kernel/sched/deadline.c | 10 ++++++++++
kernel/sched/rt.c | 10 ++++++++++
kernel/sched/sched.h | 4 ++++
3 files changed, 24 insertions(+)
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -479,6 +479,13 @@ static void dec_dl_migration(struct sche
update_dl_migration(dl_rq);
}
+#ifdef CONFIG_PREEMPT_RT
+static void update_migratory_dl(struct task_struct *p, long delta)
+{
+ task_rq(p)->dl.dl_nr_migratory += delta;
+}
+#endif
+
/*
* The list of pushable -deadline task is not a plist, like in
* sched_rt.c, it is an rb-tree with tasks ordered by deadline.
@@ -2499,6 +2506,9 @@ const struct sched_class dl_sched_class
.rq_online = rq_online_dl,
.rq_offline = rq_offline_dl,
.task_woken = task_woken_dl,
+#ifdef CONFIG_PREEMPT_RT
+ .update_migratory = update_migratory_dl,
+#endif
#endif
.task_tick = task_tick_dl,
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -2272,6 +2272,13 @@ static void switched_from_rt(struct rq *
rt_queue_pull_task(rq);
}
+#ifdef CONFIG_PREEMPT_RT
+static void update_migratory_rt(struct task_struct *p, long delta)
+{
+ task_rq(p)->rt.rt_nr_migratory += delta;
+}
+#endif
+
void __init init_sched_rt_class(void)
{
unsigned int i;
@@ -2449,6 +2456,9 @@ const struct sched_class rt_sched_class
.rq_offline = rq_offline_rt,
.task_woken = task_woken_rt,
.switched_from = switched_from_rt,
+#ifdef CONFIG_PREEMPT_RT
+ .update_migratory = update_migratory_rt,
+#endif
#endif
.task_tick = task_tick_rt,
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1808,6 +1808,10 @@ struct sched_class {
void (*set_cpus_allowed)(struct task_struct *p,
const struct cpumask *newmask);
+#ifdef CONFIG_PREEMPT_RT
+ void (*update_migratory)(struct task_struct *p, long delta);
+#endif
+
void (*rq_online)(struct rq *rq);
void (*rq_offline)(struct rq *rq);
#endif
next prev parent reply other threads:[~2020-09-17 10:52 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 9:42 [patch 00/10] sched: Migrate disable support for RT Thomas Gleixner
2020-09-17 9:42 ` [patch 01/10] sched: Fix balance_callback() Thomas Gleixner
2020-09-17 9:42 ` [patch 02/10] sched/hotplug: Ensure only per-cpu kthreads run during hotplug Thomas Gleixner
2020-09-17 9:42 ` [patch 03/10] sched/core: Wait for tasks being pushed away on hotplug Thomas Gleixner
2020-09-17 9:42 ` [patch 04/10] sched/hotplug: Consolidate task migration on CPU unplug Thomas Gleixner
2020-09-17 9:42 ` [patch 05/10] sched/core: Split __set_cpus_allowed_ptr() Thomas Gleixner
2020-09-17 9:42 ` [patch 06/10] sched: Add task components for migration control Thomas Gleixner
2020-09-17 9:42 ` [patch 07/10] sched/core: Add mechanism to wait for affinity setting to complete Thomas Gleixner
2020-09-17 9:42 ` Thomas Gleixner [this message]
2020-09-17 9:42 ` [patch 09/10] sched/core: Add migrate_disable/enable() Thomas Gleixner
2020-09-17 14:24 ` peterz
2020-09-17 14:38 ` Sebastian Siewior
2020-09-17 14:49 ` peterz
2020-09-17 15:13 ` Sebastian Siewior
2020-09-17 15:54 ` peterz
2020-09-17 16:30 ` Sebastian Siewior
2020-09-18 8:22 ` peterz
2020-09-18 8:48 ` Sebastian Siewior
2020-09-18 7:00 ` Thomas Gleixner
2020-09-18 8:28 ` peterz
2020-09-17 9:42 ` [patch 10/10] sched/core: Make migrate disable and CPU hotplug cooperative Thomas Gleixner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200917101624.708629719@linutronix.de \
--to=tglx@linutronix.de \
--cc=bigeasy@linutronix.de \
--cc=bristot@redhat.com \
--cc=bsegall@google.com \
--cc=dietmar.eggemann@arm.com \
--cc=juri.lelli@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mgorman@suse.de \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=qais.yousef@arm.com \
--cc=rostedt@goodmis.org \
--cc=swood@redhat.com \
--cc=valentin.schneider@arm.com \
--cc=vincent.donnefort@arm.com \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox