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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-03-27 16:02:08 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-05-02 14:43:23 -0700
commit616c310e83b872024271c915c1b9ab505b9efad9 (patch)
tree1339bc7b3bef920b4641a5af2f182e9dfa2a6632 /kernel/rcutree.h
parent66f75a5d028beaf67c931435fdc3e7823125730c (diff)
rcu: Move PREEMPT_RCU preemption to switch_to() invocation
Currently, PREEMPT_RCU readers are enqueued upon entry to the scheduler. This is inefficient because enqueuing is required only if there is a context switch, and entry to the scheduler does not guarantee a context switch. The commit therefore moves the enqueuing to immediately precede the call to switch_to() from the scheduler. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/rcutree.h')
-rw-r--r--kernel/rcutree.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index cdd1be0a4072..d6b70b08a01a 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -423,7 +423,6 @@ DECLARE_PER_CPU(char, rcu_cpu_has_work);
/* Forward declarations for rcutree_plugin.h */
static void rcu_bootup_announce(void);
long rcu_batches_completed(void);
-static void rcu_preempt_note_context_switch(int cpu);
static int rcu_preempt_blocked_readers_cgp(struct rcu_node *rnp);
#ifdef CONFIG_HOTPLUG_CPU
static void rcu_report_unblock_qs_rnp(struct rcu_node *rnp,