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Date:   Thu, 21 Dec 2017 18:14:49 +0100
From:   Frederic Weisbecker <>
To:     LKML <>
Cc:     Frederic Weisbecker <>,
        Peter Zijlstra <>,
        Chris Metcalf <>,
        Thomas Gleixner <>,
        Luiz Capitulino <>,
        Christoph Lameter <>,
        "Paul E . McKenney" <>,
        Ingo Molnar <>,
        Wanpeng Li <>,
        Mike Galbraith <>, Rik van Riel <>
Subject: [PATCH 5/5] sched/isolation: Document "nohz_offload" flag

Document the interface to offload the 1Hz scheduler tick in full
dynticks mode. Also improve the comment about the existing "nohz" flag
in order to differentiate its behaviour.

Signed-off-by: Frederic Weisbecker <>
Cc: Chris Metcalf <>
Cc: Christoph Lameter <>
Cc: Luiz Capitulino <>
Cc: Mike Galbraith <>
Cc: Paul E. McKenney <>
Cc: Peter Zijlstra <>
Cc: Rik van Riel <>
Cc: Thomas Gleixner <>
Cc: Wanpeng Li <>
Cc: Ingo Molnar <>
 Documentation/admin-guide/kernel-parameters.txt | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 1683107..fcc5fd9 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1745,7 +1745,12 @@
 			specified in the flag list (default: domain):
-			  Disable the tick when a single task runs.
+			  Disable the tick when a single task runs. A residual 1Hz
+			  tick remains to maintain scheduler stats alive.
+			nohz_offload
+			  Like nohz but the residual 1Hz tick is offloaded to
+			  housekeeping CPUs, leaving the CPU free of any tick if
+			  nothing else requests it.
 			  Isolate from the general SMP balancing and scheduling
 			  algorithms. Note that performing domain isolation this way

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