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percpu_counter: use this_cpu_ptr() instead of per_cpu_ptr()

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this_cpu_ptr() avoids an array lookup and can use the percpu offset of the
local cpu directly.

Signed-off-by: Christoph Lameter <cl@linux.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2010-10-26 14:23:09 -07:00 committed by Linus Torvalds
parent 041b78f232
commit ea00c30b5b
1 changed files with 3 additions and 3 deletions
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6
lib/percpu_counter.c
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@ -73,9 +73,9 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
{
s64 count;
s32 *pcount;
int cpu = get_cpu();
pcount = per_cpu_ptr(fbc->counters, cpu);
preempt_disable();
pcount = this_cpu_ptr(fbc->counters);
count = *pcount + amount;
if (count >= batch || count <= -batch) {
spin_lock(&fbc->lock);
@ -85,7 +85,7 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
} else {
*pcount = count;
}
put_cpu();
preempt_enable();
}
EXPORT_SYMBOL(__percpu_counter_add);