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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-03-28 01:02:08 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2012-05-02 23:43:23 +0200 |
| commit | 616c310e83b872024271c915c1b9ab505b9efad9 (patch) | |
| tree | 1339bc7b3bef920b4641a5af2f182e9dfa2a6632 /kernel/rcutree.c | |
| parent | Linux 3.4-rc4 (diff) | |
| download | linux-616c310e83b872024271c915c1b9ab505b9efad9.tar.xz linux-616c310e83b872024271c915c1b9ab505b9efad9.zip | |
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.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/rcutree.c b/kernel/rcutree.c index 1050d6d3922c..61351505ec78 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); |