linux-kernel - [PATCH tip/core/rcu 1/3] doc: Now jiffies_till_sched_qs solicits help from cond

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Date:   Wed,  9 Jan 2019 13:37:33 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: [PATCH tip/core/rcu 1/3] 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@...ux.ibm.com>
---
 .../admin-guide/kernel-parameters.txt         | 27 ++++++++++---------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index b799bcf67d7b..4974966451e2 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -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
-- 
2.17.1