The following commit has been merged into the timers/nohz branch of tip: Commit-ID: 176b8906c399a170886ea4bad5b24763c6713d61 Gitweb: https://git.kernel.org/tip/176b8906c399a170886ea4bad5b24763c6713d61 Author: Frederic Weisbecker <frederic@xxxxxxxxxx> AuthorDate: Thu, 13 May 2021 01:29:19 +02:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitterDate: Thu, 13 May 2021 14:21:21 +02:00 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@xxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210512232924.150322-6-frederic@xxxxxxxxxx --- kernel/time/Kconfig | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 83e158d..7df71ef 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
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