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rcu: Improve srcu_readers_active_idx()'s cache locality 

Expand the calls to srcu_readers_active_idx() from srcu_readers_active()
inline.  This change improves cache locality by interating over the CPUs
once rather than twice.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Lai Jiangshan 2012-03-06 17:57:34 +08:00 committed by Paul E. McKenney
parent 966f58c2f6
commit dc87917501
1 changed files with 8 additions and 1 deletions
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9
kernel/srcu.c
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@ -193,7 +193,14 @@ static bool srcu_readers_active_idx_check(struct srcu_struct *sp, int idx)
*/
static int srcu_readers_active(struct srcu_struct *sp)
{
return srcu_readers_active_idx(sp, 0) + srcu_readers_active_idx(sp, 1);
int cpu;
unsigned long sum = 0;
for_each_possible_cpu(cpu) {
sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[0]);
sum += ACCESS_ONCE(per_cpu_ptr(sp->per_cpu_ref, cpu)->c[1]);
}
return sum;
}
/**