Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 5/8] tick/nohz: Update nohz_full Kconfig help | Date | Thu, 22 Apr 2021 14:01:55 +0200 |
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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> Cc: Yunfeng Ye <yeyunfeng@huawei.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> --- kernel/time/Kconfig | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 83e158d016ba..6649e1d2dba5 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 nohz_full parameter, this behaves just + like NO_HZ_IDLE. - Say N. + If you're a distro say Y. endchoice -- 2.25.1
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