Commit-ID: 98a06af93784a6ae541e9fc6292ef26177832543 Gitweb: https://git.kernel.org/tip/98a06af93784a6ae541e9fc6292ef26177832543 Author: Frederic Weisbecker <[email protected]> AuthorDate: Fri, 27 Oct 2017 04:42:39 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Fri, 27 Oct 2017 09:55:32 +0200
sched/isolation: Document the isolcpus= flags Signed-off-by: Frederic Weisbecker <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Luiz Capitulino <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Wanpeng Li <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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]
