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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-06-02 20:26:43 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2017-07-25 01:00:15 +0200 |
| commit | f99bcb2cdb5843548a2b0b78157cb7a0b4c7ccac (patch) | |
| tree | 5ac6ecbfcf517eca466a3c57fe1654ae9180c5ee /Documentation | |
| parent | Linux 4.13-rc2 (diff) | |
| download | linux-f99bcb2cdb5843548a2b0b78157cb7a0b4c7ccac.tar.xz linux-f99bcb2cdb5843548a2b0b78157cb7a0b4c7ccac.zip | |
documentation: Fix relation between nohz_full and rcu_nocbs
If a CPU is specified in the nohz_full= kernel boot parameter to a
kernel built with CONFIG_NO_HZ_FULL=y, then that CPU's callbacks will
be offloaded, just as if that CPU had also been specified in the
rcu_nocbs= kernel boot parameter. But the current documentation
states that the user must keep these two boot parameters manually
synchronized. This commit therefore updates the documentation to
reflect reality.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index d9c171ce4190..3a99cc96b6b1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2633,9 +2633,10 @@ In kernels built with CONFIG_NO_HZ_FULL=y, set the specified list of CPUs whose tick will be stopped whenever possible. The boot CPU will be forced outside - the range to maintain the timekeeping. - The CPUs in this range must also be included in the - rcu_nocbs= set. + the range to maintain the timekeeping. Any CPUs + in this list will have their RCU callbacks offloaded, + just as if they had also been called out in the + rcu_nocbs= boot parameter. noiotrap [SH] Disables trapped I/O port accesses. |