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| author | Christoph Lameter <cl@linux-foundation.org> | 2009-10-03 19:48:23 +0900 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2009-10-03 19:48:23 +0900 |
| commit | e800879d50c5a528d40191528557b1bdfbccbd42 (patch) | |
| tree | 5cf00a68df5c0b63dcb8c84f00b0ecb48910c0fa | |
| parent | 4dac3e98840f11bb2d8d52fd375150c7c1912117 (diff) | |
| download | op-kernel-dev-e800879d50c5a528d40191528557b1bdfbccbd42.zip op-kernel-dev-e800879d50c5a528d40191528557b1bdfbccbd42.tar.gz | |
this_cpu: Use this_cpu operations in RCU
RCU does not do dynamic allocations but it increments per cpu variables
a lot. These instructions results in a move to a register and then back
to memory. This patch will make it use the inc/dec instructions on x86
that do not need a register.
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | kernel/rcutorture.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/rcutorture.c b/kernel/rcutorture.c index 233768f..178967b 100644 --- a/kernel/rcutorture.c +++ b/kernel/rcutorture.c @@ -731,13 +731,13 @@ static void rcu_torture_timer(unsigned long unused) /* Should not happen, but... */ pipe_count = RCU_TORTURE_PIPE_LEN; } - ++__get_cpu_var(rcu_torture_count)[pipe_count]; + __this_cpu_inc(per_cpu_var(rcu_torture_count)[pipe_count]); completed = cur_ops->completed() - completed; if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } - ++__get_cpu_var(rcu_torture_batch)[completed]; + __this_cpu_inc(per_cpu_var(rcu_torture_batch)[completed]); preempt_enable(); cur_ops->readunlock(idx); } @@ -786,13 +786,13 @@ rcu_torture_reader(void *arg) /* Should not happen, but... */ pipe_count = RCU_TORTURE_PIPE_LEN; } - ++__get_cpu_var(rcu_torture_count)[pipe_count]; + __this_cpu_inc(per_cpu_var(rcu_torture_count)[pipe_count]); completed = cur_ops->completed() - completed; if (completed > RCU_TORTURE_PIPE_LEN) { /* Should not happen, but... */ completed = RCU_TORTURE_PIPE_LEN; } - ++__get_cpu_var(rcu_torture_batch)[completed]; + __this_cpu_inc(per_cpu_var(rcu_torture_batch)[completed]); preempt_enable(); cur_ops->readunlock(idx); schedule(); |
