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Subject[tip:sched/core] sched/isolation: Document the isolcpus= flags
Commit-ID:  98a06af93784a6ae541e9fc6292ef26177832543
Gitweb: https://git.kernel.org/tip/98a06af93784a6ae541e9fc6292ef26177832543
Author: Frederic Weisbecker <frederic@kernel.org>
AuthorDate: Fri, 27 Oct 2017 04:42:39 +0200
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 27 Oct 2017 09:55:32 +0200

sched/isolation: Document the isolcpus= flags

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Link: http://lkml.kernel.org/r/1509072159-31808-13-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
Documentation/admin-guide/kernel-parameters.txt | 33 +++++++++++++++----------
1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 6b99c8b..5853618 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1727,20 +1727,27 @@
isapnp= [ISAPNP]
Format: <RDP>,<reset>,<pci_scan>,<verbosity>

- isolcpus= [KNL,SMP] Isolate CPUs from the general scheduler.
- The argument is a cpu list, as described above.
+ isolcpus= [KNL,SMP] Isolate a given set of CPUs from disturbance.
+ Format: [flag-list,]<cpu-list>
+
+ Specify one or more CPUs to isolate from disturbances
+ specified in the flag list (default: domain):
+
+ nohz
+ Disable the tick when a single task runs.
+ domain
+ Isolate from the general SMP balancing and scheduling
+ algorithms. This option is the preferred way to isolate
+ CPUs from tasks. The alternative -- manually setting the
+ CPU mask of all tasks in the system, can cause problems
+ and suboptimal load balancer performance. You can move a
+ process onto or off an "isolated" CPU via the CPU
+ affinity syscalls or cpuset. <cpu number> begins at 0
+ and the maximum value is "number of CPUs in system - 1".
+
+ The format of <cpu-list> is described above.
+

- This option can be used to specify one or more CPUs
- to isolate from the general SMP balancing and scheduling
- algorithms. You can move a process onto or off an
- "isolated" CPU via the CPU affinity syscalls or cpuset.
- <cpu number> begins at 0 and the maximum value is
- "number of CPUs in system - 1".
-
- This option is the preferred way to isolate CPUs. The
- alternative -- manually setting the CPU mask of all
- tasks in the system -- can cause problems and
- suboptimal load balancer performance.

iucv= [HW,NET]

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