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| author | Paul E. McKenney <paulmck@kernel.org> | 2021-09-27 23:18:51 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-12-01 02:24:47 +0100 |
| commit | e2c73a6860bdf54f2c6bf8cddc34ddc91a1343e1 (patch) | |
| tree | d8b4e1ad9c9a7131bfe6fe50235e4d66465364cc /Documentation/admin-guide/kernel-parameters.txt | |
| parent | torture: Remove RCU_FAST_NO_HZ from rcu scenarios (diff) | |
| download | linux-e2c73a6860bdf54f2c6bf8cddc34ddc91a1343e1.tar.xz linux-e2c73a6860bdf54f2c6bf8cddc34ddc91a1343e1.zip | |
rcu: Remove the RCU_FAST_NO_HZ Kconfig option
All of the uses of CONFIG_RCU_FAST_NO_HZ=y that I have seen involve
systems with RCU callbacks offloaded. In this situation, all that this
Kconfig option does is slow down idle entry/exit with an additional
allways-taken early exit. If this is the only use case, then this
Kconfig option nothing but an attractive nuisance that needs to go away.
This commit therefore removes the RCU_FAST_NO_HZ Kconfig option.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 9725c546a0d4..36b83a47e54a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4489,10 +4489,6 @@ on rcutree.qhimark at boot time and to zero to disable more aggressive help enlistment. - rcutree.rcu_idle_gp_delay= [KNL] - Set wakeup interval for idle CPUs that have - RCU callbacks (RCU_FAST_NO_HZ=y). - rcutree.rcu_kick_kthreads= [KNL] Cause the grace-period kthread to get an extra wake_up() if it sleeps three times longer than |