Commit 29ce8310 authored May 04, 2011 by Gleb Natapov Committed by Paul E. McKenney May 05, 2011

rcu: provide rcu_virt_note_context_switch() function.



Provide rcu_virt_note_context_switch() for vitalization use to note
quiescent state during guest entry.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent bad6e139

include/linux/rcutiny.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -99,6 +99,14 @@ static inline void rcu_note_context_switch(int cpu)
		rcu_preempt_note_context_switch();
		}

		/*
		* Take advantage of the fact that there is only one CPU, which
		* allows us to ignore virtualization-based context switches.
		*/
		static inline void rcu_virt_note_context_switch(int cpu)
		{
		}

		/*
		* Return the number of grace periods.
		*/

include/linux/rcutree.h

+10 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,16 @@ extern void rcu_note_context_switch(int cpu);
		extern int rcu_needs_cpu(int cpu);
		extern void rcu_cpu_stall_reset(void);

		/*
		* Note a virtualization-based context switch. This is simply a
		* wrapper around rcu_note_context_switch(), which allows TINY_RCU
		* to save a few bytes.
		*/
		static inline void rcu_virt_note_context_switch(int cpu)
		{
		rcu_note_context_switch(cpu);
		}

		#ifdef CONFIG_TREE_PREEMPT_RCU

		extern void exit_rcu(void);

kernel/rcutree.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -157,6 +157,7 @@ void rcu_note_context_switch(int cpu)
		rcu_sched_qs(cpu);
		rcu_preempt_note_context_switch(cpu);
		}
		EXPORT_SYMBOL_GPL(rcu_note_context_switch);

		#ifdef CONFIG_NO_HZ
		DEFINE_PER_CPU(struct rcu_dynticks, rcu_dynticks) = {