summaryrefslogtreecommitdiff
path: root/kernel/time
diff options
context:
space:
mode:
authorFrederic Weisbecker <frederic@kernel.org>2021-05-13 01:29:19 +0200
committerIngo Molnar <mingo@kernel.org>2021-05-13 14:21:21 +0200
commit176b8906c399a170886ea4bad5b24763c6713d61 (patch)
treee7ed308fa41557beff3f67b05a4a30a90b1e6ebf /kernel/time
parent96c9b90396f9ab6caf13b4ebf00095818ac53b7f (diff)
tick/nohz: Update nohz_full Kconfig help
CONFIG_NO_HZ_FULL behaves just like CONFIG_NO_HZ_IDLE by default. Reassure distros about it. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20210512232924.150322-6-frederic@kernel.org
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/Kconfig11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 83e158d016ba..7df71ef0e1fd 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -117,13 +117,14 @@ config NO_HZ_FULL
the task mostly runs in userspace and has few kernel activity.
You need to fill up the nohz_full boot parameter with the
- desired range of dynticks CPUs.
+ desired range of dynticks CPUs to use it. This is implemented at
+ the expense of some overhead in user <-> kernel transitions:
+ syscalls, exceptions and interrupts.
- This is implemented at the expense of some overhead in user <-> kernel
- transitions: syscalls, exceptions and interrupts. Even when it's
- dynamically off.
+ By default, without passing the nohz_full parameter, this behaves just
+ like NO_HZ_IDLE.
- Say N.
+ If you're a distro say Y.
endchoice