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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com,
	akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
	josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de,
	peterz@infradead.org, rostedt@goodmis.org,
	Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
	eric.dumazet@gmail.com, darren@dvhart.com, fweisbec@gmail.com,
	sbw@mit.edu, patches@linaro.org,
	Alessio Igor Bogani <abogani@kernel.org>,
	Avi Kivity <avi@redhat.com>, Chris Metcalf <cmetcalf@tilera.com>,
	Christoph Lameter <cl@linux.com>,
	Geoff Levand <geoff@infradead.org>,
	Gilad Ben Yossef <gilad@benyossef.com>,
	Hakan Akkan <hakanakkan@gmail.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
	Kevin Hilman <khilman@ti.com>,
	Max Krasnyansky <maxk@qualcomm.com>,
	Stephen Hemminger <shemminger@vyatta.com>,
	Sven-Thorsten Dietrich <thebigcorporation@gmail.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 14/26] rcu: Userspace RCU extended QS selftest
Date: Thu, 30 Aug 2012 14:05:31 -0700	[thread overview]
Message-ID: <1346360743-3628-14-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <1346360743-3628-1-git-send-email-paulmck@linux.vnet.ibm.com>

From: Frederic Weisbecker <fweisbec@gmail.com>

Provide a config option that enables the userspace
RCU extended quiescent state on every CPUs by default.

This is for testing purpose.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Alessio Igor Bogani <abogani@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Avi Kivity <avi@redhat.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Kevin Hilman <khilman@ti.com>
Cc: Max Krasnyansky <maxk@qualcomm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
 init/Kconfig     |    8 ++++++++
 kernel/rcutree.c |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index f6a1830..c26b8a1 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -451,6 +451,14 @@ config RCU_USER_QS
 	  excluded from the global RCU state machine and thus doesn't
 	  to keep the timer tick on for RCU.
 
+config RCU_USER_QS_FORCE
+	bool "Force userspace extended QS by default"
+	depends on RCU_USER_QS
+	help
+	  Set the hooks in user/kernel boundaries by default in order to
+	  test this feature that treats userspace as an extended quiescent
+	  state until we have a real user like a full adaptive nohz option.
+
 config RCU_FANOUT
 	int "Tree-based hierarchical RCU fanout value"
 	range 2 64 if 64BIT
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index af92681..ccf3cbf 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -210,7 +210,7 @@ EXPORT_SYMBOL_GPL(rcu_note_context_switch);
 DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {
 	.dynticks_nesting = DYNTICK_TASK_EXIT_IDLE,
 	.dynticks = ATOMIC_INIT(1),
-#ifdef CONFIG_RCU_USER_QS
+#if defined(CONFIG_RCU_USER_QS) && !defined(CONFIG_RCU_USER_QS_FORCE)
 	.ignore_user_qs = true,
 #endif
 };
-- 
1.7.8


  parent reply	other threads:[~2012-08-30 21:14 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-08-30 21:05 [PATCH tip/core/rcu 0/26] idle-related changes Paul E. McKenney
2012-08-30 21:05 ` [PATCH tip/core/rcu 01/26] rcu: New rcu_user_enter() and rcu_user_exit() APIs Paul E. McKenney
2012-08-30 21:05   ` [PATCH tip/core/rcu 02/26] rcu: New rcu_user_enter_irq() and rcu_user_exit_irq() APIs Paul E. McKenney
2012-08-31 19:13     ` Josh Triplett
2012-08-31 19:54       ` Frederic Weisbecker
2012-08-31 21:38         ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 03/26] rcu: Make RCU_FAST_NO_HZ handle adaptive ticks Paul E. McKenney
2012-08-31 23:40     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 04/26] rcu: Settle config for userspace extended quiescent state Paul E. McKenney
2012-08-31 23:44     ` Josh Triplett
2012-09-05  0:34       ` Paul E. McKenney
2012-09-05  0:46         ` Josh Triplett
2012-09-10 21:35           ` Frederic Weisbecker
2012-08-30 21:05   ` [PATCH tip/core/rcu 05/26] rcu: Allow rcu_user_enter()/exit() to nest Paul E. McKenney
2012-08-31 23:45     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 06/26] rcu: Ignore userspace extended quiescent state by default Paul E. McKenney
2012-08-31 23:46     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 07/26] rcu: Switch task's syscall hooks on context switch Paul E. McKenney
2012-08-31 23:48     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 08/26] x86: Syscall hooks for userspace RCU extended QS Paul E. McKenney
2012-08-31 23:59     ` Josh Triplett
2012-09-10 21:30       ` Frederic Weisbecker
2012-08-30 21:05   ` [PATCH tip/core/rcu 09/26] x86: Exception " Paul E. McKenney
2012-08-31 23:51     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 10/26] rcu: Exit RCU extended QS on kernel preemption after irq/exception Paul E. McKenney
2012-08-31 23:51     ` Josh Triplett
2012-09-06 16:52     ` Peter Zijlstra
2012-09-10 20:31       ` Frederic Weisbecker
2012-08-30 21:05   ` [PATCH tip/core/rcu 11/26] rcu: Exit RCU extended QS on user preemption Paul E. McKenney
2012-08-31 23:52     ` Josh Triplett
2012-09-06 17:02     ` Peter Zijlstra
2012-09-06 17:13       ` Peter Zijlstra
2012-09-10 20:26         ` Frederic Weisbecker
2012-09-12  9:33           ` Peter Zijlstra
2012-09-12 12:06             ` Frederic Weisbecker
2012-09-12 12:41               ` Peter Zijlstra
2012-09-12 12:52                 ` Peter Zijlstra
2012-09-12 13:54                   ` Frederic Weisbecker
2012-09-12 14:09                     ` Peter Zijlstra
2012-09-12 13:52                 ` Frederic Weisbecker
2012-09-12 15:21                 ` Paul E. McKenney
2012-08-30 21:05   ` [PATCH tip/core/rcu 12/26] x86: Use the new schedule_user API on userspace preemption Paul E. McKenney
2012-08-31 23:53     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 13/26] x86: Exit RCU extended QS on notify resume Paul E. McKenney
2012-08-31 23:54     ` Josh Triplett
2012-08-30 21:05   ` Paul E. McKenney [this message]
2012-08-31 23:54     ` [PATCH tip/core/rcu 14/26] rcu: Userspace RCU extended QS selftest Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 15/26] alpha: Fix preemption handling in idle loop Paul E. McKenney
2012-08-31 23:55     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 16/26] alpha: Add missing RCU idle APIs on " Paul E. McKenney
2012-09-01  0:00     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 17/26] cris: " Paul E. McKenney
2012-09-01  0:01     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 18/26] frv: " Paul E. McKenney
2012-09-01  0:01     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 19/26] h8300: " Paul E. McKenney
2012-09-01  0:02     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 20/26] m32r: " Paul E. McKenney
2012-09-01  0:02     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 21/26] m68k: " Paul E. McKenney
2012-09-01  0:02     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 22/26] mn10300: " Paul E. McKenney
2012-09-01  0:03     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 23/26] parisc: " Paul E. McKenney
2012-09-01  0:03     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 24/26] score: " Paul E. McKenney
2012-09-01  0:04     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 25/26] xtensa: " Paul E. McKenney
2012-09-01  0:05     ` Josh Triplett
2012-08-30 21:05   ` [PATCH tip/core/rcu 26/26] ia64: " Paul E. McKenney
2012-09-01  0:05     ` Josh Triplett
2012-08-31 19:07   ` [PATCH tip/core/rcu 01/26] rcu: New rcu_user_enter() and rcu_user_exit() APIs Josh Triplett
2012-09-05  1:04     ` Paul E. McKenney

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