doc: Now jiffies_till_sched_qs solicits help from cond_resched()
authorPaul E. McKenney <paulmck@linux.ibm.com>
Tue, 20 Nov 2018 18:22:00 +0000 (10:22 -0800)
committerPaul E. McKenney <paulmck@linux.ibm.com>
Fri, 25 Jan 2019 23:34:17 +0000 (15:34 -0800)
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>
Documentation/admin-guide/kernel-parameters.txt

index b0dbb2f..bec49d5 100644 (file)
                        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.
                        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