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Commit ea00c30b authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

percpu_counter: use this_cpu_ptr() instead of per_cpu_ptr() 



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

Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 041b78f2

lib/percpu_counter.c

+3 −3
Original line number Diff line number Diff line
@@ -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);