From: Frederic Weisbecker Date: Wed, 12 May 2021 23:29:19 +0000 (+0200) Subject: tick/nohz: Update nohz_full Kconfig help X-Git-Tag: v5.14-rc1~177^2~5 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=176b8906c399a170886ea4bad5b24763c6713d61;p=thirdparty%2Flinux.git 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 Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra Link: https://lore.kernel.org/r/20210512232924.150322-6-frederic@kernel.org --- diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 83e158d016bad..7df71ef0e1fd9 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