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| author |   Paul E. McKenney <paulmck@kernel.org> | 2021-09-27 10:54:22 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2021-11-30 17:23:06 -0800 |
| commit | db4cb76861282604cf14fb362f507bb587d676ba (patch) | |
| tree | 279a84f3c698df8ad01e3dbeef50362f6aed2d99 /scripts/gdb/linux/utils.py | |
| parent | rcutorture: Add CONFIG_PREEMPT_DYNAMIC=n to tiny scenarios (diff) | |
| download | linux-dev-db4cb76861282604cf14fb362f507bb587d676ba.tar.xz linux-dev-db4cb76861282604cf14fb362f507bb587d676ba.zip | |
doc: Remove obsolete kernel-per-CPU-kthreads RCU_FAST_NO_HZ advice
This document advises building with both CONFIG_NO_HZ=y and
CONFIG_RCU_FAST_NO_HZ=y. However, CONFIG_NO_HZ=y offloads callbacks from
all nohz_full CPUs, and CPUs with offloaded callbacks do not benefit from
CONFIG_RCU_FAST_NO_HZ=y. Quite the opposite: CONFIG_RCU_FAST_NO_HZ=y
simply adds a bit of idle entry/exit overhead.
This commit therefore changes that advice to only CONFIG_NO_HZ=y.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'scripts/gdb/linux/utils.py')
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