From: Frederic Weisbecker <frederic@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <frederic@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Chris Metcalf <cmetcalf@mellanox.com>,
Thomas Gleixner <tglx@linutronix.de>,
Luiz Capitulino <lcapitulino@redhat.com>,
Christoph Lameter <cl@linux.com>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Wanpeng Li <kernellwp@gmail.com>, Mike Galbraith <efault@gmx.de>,
Rik van Riel <riel@redhat.com>
Subject: [PATCH 6/6] sched/isolation: Update nohz documentation to explain tick offload
Date: Thu, 15 Feb 2018 01:48:14 +0100 [thread overview]
Message-ID: <1518655694-8057-7-git-send-email-frederic@kernel.org> (raw)
In-Reply-To: <1518655694-8057-1-git-send-email-frederic@kernel.org>
Update the documentation to reflect the 1Hz tick offload changes.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wanpeng Li <kernellwp@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 1d1d53f..50b9837 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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
--
2.7.4
next prev parent reply other threads:[~2018-02-15 0:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 0:48 [PATCH 0/6] isolation: 1Hz residual tick offloading v6 Frederic Weisbecker
2018-02-15 0:48 ` [PATCH 1/6] sched: Rename init_rq_hrtick to hrtick_rq_init Frederic Weisbecker
2018-02-17 10:22 ` Thomas Gleixner
2018-02-15 0:48 ` [PATCH 2/6] nohz: Allow to check if remote CPU tick is stopped Frederic Weisbecker
2018-02-17 10:27 ` Thomas Gleixner
2018-02-15 0:48 ` [PATCH 3/6] sched/isolation: Isolate workqueues when "nohz_full=" is set Frederic Weisbecker
2018-02-17 10:31 ` Thomas Gleixner
2018-02-15 0:48 ` [PATCH 4/6] sched/isolation: Offload residual 1Hz scheduler tick Frederic Weisbecker
2018-02-17 10:50 ` Thomas Gleixner
2018-02-20 15:44 ` Frederic Weisbecker
2018-02-15 0:48 ` [PATCH 5/6] sched/nohz: Remove the 1 Hz tick code Frederic Weisbecker
2018-02-17 10:51 ` Thomas Gleixner
2018-02-15 0:48 ` Frederic Weisbecker [this message]
2018-02-17 10:53 ` [PATCH 6/6] sched/isolation: Update nohz documentation to explain tick offload Thomas Gleixner
2018-02-20 16:40 ` Frederic Weisbecker
2018-02-16 13:38 ` [PATCH 0/6] isolation: 1Hz residual tick offloading v6 Peter Zijlstra
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