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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-03-27 23:02:08 (GMT)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-05-02 21:43:23 (GMT)
commit616c310e83b872024271c915c1b9ab505b9efad9 (patch)
tree1339bc7b3bef920b4641a5af2f182e9dfa2a6632 /kernel/rcutree.c
parent66f75a5d028beaf67c931435fdc3e7823125730c (diff)
downloadlinux-616c310e83b872024271c915c1b9ab505b9efad9.tar.xz
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.c')
-rw-r--r--kernel/rcutree.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 1050d6d..6135150 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -192,7 +192,6 @@ void rcu_note_context_switch(int cpu)
{
trace_rcu_utilization("Start context switch");
rcu_sched_qs(cpu);
- rcu_preempt_note_context_switch(cpu);
trace_rcu_utilization("End context switch");
}
EXPORT_SYMBOL_GPL(rcu_note_context_switch);