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| author | Frederic Weisbecker <frederic@kernel.org> | 2021-05-13 01:29:19 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-05-13 14:21:21 +0200 |
| commit | 176b8906c399a170886ea4bad5b24763c6713d61 (patch) | |
| tree | e7ed308fa41557beff3f67b05a4a30a90b1e6ebf /kernel/time | |
| parent | 96c9b90396f9ab6caf13b4ebf00095818ac53b7f (diff) | |
| download | linux-176b8906c399a170886ea4bad5b24763c6713d61.tar.bz2 | |
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/Kconfig | 11 |
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 |