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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 00/10] sched: Migrate disable support for RT
Date: Thu, 17 Sep 2020 11:42:02 +0200	[thread overview]
Message-ID: <20200917094202.301694311@linutronix.de> (raw)

On RT enabled kernels most of the code including spin/rw lock held sections
are preemptible, which also makes the tasks migrateable. That violates the
per CPU constraints. RT needs therefore a mechanism to control migration
independent of preemption.

This series is providing a mostly rewritten version of the RT code based on
the newest scheduler bits and includes and depends on Peter's 'let tasks
kick themself off the outgoing CPU' feature.

While migrate disable/enable are trivial in principle the tricky part is
the coordination and serialization against concurrent affinity changes,
e.g. sched_setaffinity(2), and CPU hotplug.

Thanks,

	tglx

             reply	other threads:[~2020-09-17 10:49 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-17  9:42 Thomas Gleixner [this message]
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 ` [patch 08/10] sched: Add update_migratory() callback to scheduler classes Thomas Gleixner
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

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