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doc: Now jiffies_till_sched_qs solicits help from cond_resched() 

The rcutree.jiffies_till_sched_qs kernel boot parameter used to solicit
help only from rcu_note_context_switch(), but now also solicits help
from cond_resched().  This commit therefore updates kernel-parameters.txt
accordingly.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-11-20 10:22:00 -08:00
parent 7a968bb26a
commit 1a4762b927
1 changed files with 14 additions and 13 deletions
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27
Documentation/admin-guide/kernel-parameters.txt
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@ -3654,19 +3654,6 @@
latencies, which will choose a value aligned
with the appropriate hardware boundaries.
rcutree.jiffies_till_sched_qs= [KNL]
Set required age in jiffies for a
given grace period before RCU starts
soliciting quiescent-state help from
rcu_note_context_switch(). If not specified, the
kernel will calculate a value based on the most
recent settings of rcutree.jiffies_till_first_fqs
and rcutree.jiffies_till_next_fqs.
This calculated value may be viewed in
rcutree.jiffies_to_sched_qs. Any attempt to
set rcutree.jiffies_to_sched_qs will be
cheerfully overwritten.
rcutree.jiffies_till_first_fqs= [KNL]
Set delay from grace-period initialization to
first attempt to force quiescent states.
@ -3678,6 +3665,20 @@
quiescent states. Units are jiffies, minimum
value is one, and maximum value is HZ.
rcutree.jiffies_till_sched_qs= [KNL]
Set required age in jiffies for a
given grace period before RCU starts
soliciting quiescent-state help from
rcu_note_context_switch() and cond_resched().
If not specified, the kernel will calculate
a value based on the most recent settings
of rcutree.jiffies_till_first_fqs
and rcutree.jiffies_till_next_fqs.
This calculated value may be viewed in
rcutree.jiffies_to_sched_qs. Any attempt to set
rcutree.jiffies_to_sched_qs will be cheerfully
overwritten.
rcutree.kthread_prio= [KNL,BOOT]
Set the SCHED_FIFO priority of the RCU per-CPU
kthreads (rcuc/N). This value is also used for