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Message-Id: <1495749601-21574-75-git-send-email-paulmck@linux.vnet.ibm.com>
Date: Thu, 25 May 2017 14:59:48 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.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, bobby.prani@...il.com,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Rik van Riel <riel@...hat.com>
Subject: [PATCH tip/core/rcu 75/88] rcu: Remove the RCU_KTHREAD_PRIO Kconfig option
Anything that can be done with the RCU_KTHREAD_PRIO Kconfig option can
also be done with the rcutree.kthread_prio kernel boot parameter.
This commit therefore removes this Kconfig option.
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Rik van Riel <riel@...hat.com>
---
init/Kconfig | 31 ----------------------
kernel/rcu/tree.c | 4 ---
.../selftests/rcutorture/configs/rcu/TREE03 | 1 -
.../selftests/rcutorture/configs/rcu/TREE03.boot | 1 +
.../selftests/rcutorture/doc/TREE_RCU-kconfig.txt | 1 -
5 files changed, 1 insertion(+), 37 deletions(-)
diff --git a/init/Kconfig b/init/Kconfig
index a2cfde19e8b8..6f257d51f582 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -697,37 +697,6 @@ config RCU_BOOST
Say Y here if you are working with real-time apps or heavy loads
Say N here if you are unsure.
-config RCU_KTHREAD_PRIO
- int "Real-time priority to use for RCU worker threads"
- range 1 99 if RCU_BOOST
- range 0 99 if !RCU_BOOST
- default 1 if RCU_BOOST
- default 0 if !RCU_BOOST
- depends on RCU_EXPERT
- help
- This option specifies the SCHED_FIFO priority value that will be
- assigned to the rcuc/n and rcub/n threads and is also the value
- used for RCU_BOOST (if enabled). If you are working with a
- real-time application that has one or more CPU-bound threads
- running at a real-time priority level, you should set
- RCU_KTHREAD_PRIO to a priority higher than the highest-priority
- real-time CPU-bound application thread. The default RCU_KTHREAD_PRIO
- value of 1 is appropriate in the common case, which is real-time
- applications that do not have any CPU-bound threads.
-
- Some real-time applications might not have a single real-time
- thread that saturates a given CPU, but instead might have
- multiple real-time threads that, taken together, fully utilize
- that CPU. In this case, you should set RCU_KTHREAD_PRIO to
- a priority higher than the lowest-priority thread that is
- conspiring to prevent the CPU from running any non-real-time
- tasks. For example, if one thread at priority 10 and another
- thread at priority 5 are between themselves fully consuming
- the CPU time on a given CPU, then RCU_KTHREAD_PRIO should be
- set to priority 6 or higher.
-
- Specify the real-time priority, or take the default if unsure.
-
config RCU_BOOST_DELAY
int "Milliseconds to delay boosting after RCU grace-period start"
range 0 3000
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index bbbddd85906b..187ac3f41526 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -168,11 +168,7 @@ static void rcu_report_exp_rdp(struct rcu_state *rsp,
static void sync_sched_exp_online_cleanup(int cpu);
/* rcuc/rcub kthread realtime priority */
-#ifdef CONFIG_RCU_KTHREAD_PRIO
-static int kthread_prio = CONFIG_RCU_KTHREAD_PRIO;
-#else /* #ifdef CONFIG_RCU_KTHREAD_PRIO */
static int kthread_prio = IS_ENABLED(CONFIG_RCU_BOOST) ? 1 : 0;
-#endif /* #else #ifdef CONFIG_RCU_KTHREAD_PRIO */
module_param(kthread_prio, int, 0644);
/* Delay in jiffies for grace-period initialization delays, debug only. */
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE03 b/tools/testing/selftests/rcutorture/configs/rcu/TREE03
index 7a17c503b382..2dc31b16e506 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/TREE03
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE03
@@ -14,6 +14,5 @@ CONFIG_RCU_FANOUT_LEAF=2
CONFIG_RCU_NOCB_CPU=n
CONFIG_DEBUG_LOCK_ALLOC=n
CONFIG_RCU_BOOST=y
-CONFIG_RCU_KTHREAD_PRIO=2
CONFIG_DEBUG_OBJECTS_RCU_HEAD=n
CONFIG_RCU_EXPERT=y
diff --git a/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot b/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot
index 9ef3aed126e9..5d2cc0bd50a0 100644
--- a/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot
+++ b/tools/testing/selftests/rcutorture/configs/rcu/TREE03.boot
@@ -2,3 +2,4 @@ rcutorture.onoff_interval=1 rcutorture.onoff_holdoff=30
rcutree.gp_preinit_delay=3
rcutree.gp_init_delay=3
rcutree.gp_cleanup_delay=3
+rcutree.kthread_prio=2
diff --git a/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
index 1dfec4657d95..b5ea8489969a 100644
--- a/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
+++ b/tools/testing/selftests/rcutorture/doc/TREE_RCU-kconfig.txt
@@ -16,7 +16,6 @@ CONFIG_PROVE_LOCKING -- Do several, covering CONFIG_DEBUG_LOCK_ALLOC=y and not.
CONFIG_PROVE_RCU -- Hardwired to CONFIG_PROVE_LOCKING.
CONFIG_PROVE_RCU_REPEATEDLY -- Do one.
CONFIG_RCU_BOOST -- one of PREEMPT_RCU.
-CONFIG_RCU_KTHREAD_PRIO -- set to 2 for _BOOST testing.
CONFIG_RCU_FANOUT -- Cover hierarchy, but overlap with others.
CONFIG_RCU_FANOUT_LEAF -- Do one non-default.
CONFIG_RCU_FAST_NO_HZ -- Do one, but not with CONFIG_RCU_NOCB_CPU_ALL.
--
2.5.2
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