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Commit 083c6eea authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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sched/isolation: Update nohz documentation to explain tick offload 



Update the documentation to reflect the 1Hz tick offload changes.

Signed-off-by: default avatarFrederic Weisbecker <frederic@kernel.org>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1519186649-3242-8-git-send-email-frederic@kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent dcdedb24

Documentation/admin-guide/kernel-parameters.txt

+11 −0
Original line number Diff line number Diff line
@@ -1766,6 +1766,17 @@ 


			nohz

			  Disable the tick when a single task runs.



			  A residual 1Hz tick is offloaded to workqueues, which you

			  need to affine to housekeeping through the global

			  workqueue's affinity configured via the

			  /sys/devices/virtual/workqueue/cpumask sysfs file, or

			  by using the 'domain' flag described below.



			  NOTE: by default the global workqueue runs on all CPUs,

			  so to protect individual CPUs the 'cpumask' file has to

			  be configured manually after bootup.



			domain

			  Isolate from the general SMP balancing and scheduling

			  algorithms. Note that performing domain isolation this way