Merge branch 'rcu/next' of... (01c9db82) · Commits · e / devices / android_kernel_teracube_2e

Documentation/RCU/RTFP.txt

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		@@ -2451,8 +2451,8 @@ lot of {Linux} into your technology!!!"
		,month="February"
		,year="2010"
		,note="Available:
		\url{http://kerneltrap.com/mailarchive/linux-netdev/2010/2/26/6270589}
		[Viewed March 20, 2011]"
		\url{http://thread.gmane.org/gmane.linux.network/153338}
		[Viewed June 9, 2014]"
		,annotation={
		Use a pair of list_head structures to support RCU-protected
		resizable hash tables.

Documentation/RCU/rcuref.txt

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		Reference-count design for elements of lists/arrays protected by RCU.


		Please note that the percpu-ref feature is likely your first
		stop if you need to combine reference counts and RCU. Please see
		include/linux/percpu-refcount.h for more information. However, in
		those unusual cases where percpu-ref would consume too much memory,
		please read on.

		------------------------------------------------------------------------

		Reference counting on elements of lists which are protected by traditional
		reader/writer spinlocks or semaphores are straightforward:

Documentation/kernel-parameters.txt

+13 −0

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		@@ -2790,6 +2790,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
		leaf rcu_node structure. Useful for very large
		systems.

		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().

		rcutree.jiffies_till_first_fqs= [KNL]
		Set delay from grace-period initialization to
		first attempt to force quiescent states.
		@@ -2801,6 +2807,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
		quiescent states. Units are jiffies, minimum
		value is one, and maximum value is HZ.

		rcutree.rcu_nocb_leader_stride= [KNL]
		Set the number of NOCB kthread groups, which
		defaults to the square root of the number of
		CPUs. Larger numbers reduces the wakeup overhead
		on the per-CPU grace-period kthreads, but increases
		that same overhead on each group's leader.

		rcutree.qhimark= [KNL]
		Set threshold of queued RCU callbacks beyond which
		batch limiting is disabled.

Documentation/memory-barriers.txt

+23 −4

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		@@ -757,10 +757,14 @@ SMP BARRIER PAIRING
		When dealing with CPU-CPU interactions, certain types of memory barrier should
		always be paired. A lack of appropriate pairing is almost certainly an error.

		A write barrier should always be paired with a data dependency barrier or read
		barrier, though a general barrier would also be viable. Similarly a read
		barrier or a data dependency barrier should always be paired with at least an
		write barrier, though, again, a general barrier is viable:
		General barriers pair with each other, though they also pair with
		most other types of barriers, albeit without transitivity. An acquire
		barrier pairs with a release barrier, but both may also pair with other
		barriers, including of course general barriers. A write barrier pairs
		with a data dependency barrier, an acquire barrier, a release barrier,
		a read barrier, or a general barrier. Similarly a read barrier or a
		data dependency barrier pairs with a write barrier, an acquire barrier,
		a release barrier, or a general barrier:

		CPU 1 CPU 2
		=============== ===============
		@@ -1893,6 +1897,21 @@ between the STORE to indicate the event and the STORE to set TASK_RUNNING:
		<general barrier> STORE current->state
		LOAD event_indicated

		To repeat, this write memory barrier is present if and only if something
		is actually awakened. To see this, consider the following sequence of
		events, where X and Y are both initially zero:

		CPU 1 CPU 2
		=============================== ===============================
		X = 1; STORE event_indicated
		smp_mb(); wake_up();
		Y = 1; wait_event(wq, Y == 1);
		wake_up(); load from Y sees 1, no memory barrier
		load from X might see 0

		In contrast, if a wakeup does occur, CPU 2's load from X would be guaranteed
		to see 1.

		The available waker functions include:

		complete();

MAINTAINERS

+15 −3

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		@@ -70,6 +70,8 @@ Descriptions of section entries:

		P: Person (obsolete)
		M: Mail patches to: FullName <address@domain>
		R: Designated reviewer: FullName <address@domain>
		These reviewers should be CCed on patches.
		L: Mailing list that is relevant to this area
		W: Web-page with status/info
		Q: Patchwork web based patch tracking system site
		@@ -7426,10 +7428,14 @@ L: linux-kernel@vger.kernel.org
		S: Supported
		T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
		F: Documentation/RCU/torture.txt
		F: kernel/rcu/torture.c
		F: kernel/rcu/rcutorture.c

		RCUTORTURE TEST FRAMEWORK
		M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
		M: Josh Triplett <josh@joshtriplett.org>
		R: Steven Rostedt <rostedt@goodmis.org>
		R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
		R: Lai Jiangshan <laijs@cn.fujitsu.com>
		L: linux-kernel@vger.kernel.org
		S: Supported
		T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
		@@ -7452,8 +7458,11 @@ S: Supported
		F: net/rds/

		READ-COPY UPDATE (RCU)
		M: Dipankar Sarma <dipankar@in.ibm.com>
		M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
		M: Josh Triplett <josh@joshtriplett.org>
		R: Steven Rostedt <rostedt@goodmis.org>
		R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
		R: Lai Jiangshan <laijs@cn.fujitsu.com>
		L: linux-kernel@vger.kernel.org
		W: http://www.rdrop.com/users/paulmck/RCU/
		S: Supported
		@@ -7463,7 +7472,7 @@ X: Documentation/RCU/torture.txt
		F: include/linux/rcu*
		X: include/linux/srcu.h
		F: kernel/rcu/
		X: kernel/rcu/torture.c
		X: kernel/torture.c

		REAL TIME CLOCK (RTC) SUBSYSTEM
		M: Alessandro Zummo <a.zummo@towertech.it>
		@@ -8236,6 +8245,9 @@ F: mm/sl?b*
		SLEEPABLE READ-COPY UPDATE (SRCU)
		M: Lai Jiangshan <laijs@cn.fujitsu.com>
		M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
		M: Josh Triplett <josh@joshtriplett.org>
		R: Steven Rostedt <rostedt@goodmis.org>
		R: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
		L: linux-kernel@vger.kernel.org
		W: http://www.rdrop.com/users/paulmck/RCU/
		S: Supported