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tick/nohz: Update nohz_full Kconfig help

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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>
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
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Frederic Weisbecker 2021-05-13 01:29:19 +02:00 committed by Ingo Molnar
parent 96c9b90396
commit 176b8906c3
1 changed files with 6 additions and 5 deletions
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kernel/time/Kconfig
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@ -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