From b2e8fb6efa209c82203c79b491b5bc952d44aa57 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 16 Oct 2007 23:25:47 -0700
Subject: mm: scalable bdi statistics counters

Provide scalable per backing_dev_info statistics counters.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/backing-dev.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'mm/backing-dev.c')

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 841901a95595..a47065e084a4 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -5,6 +5,33 @@
 #include <linux/sched.h>
 #include <linux/module.h>
 
+int bdi_init(struct backing_dev_info *bdi)
+{
+	int i, j;
+	int err;
+
+	for (i = 0; i < NR_BDI_STAT_ITEMS; i++) {
+		err = percpu_counter_init_irq(&bdi->bdi_stat[i], 0);
+		if (err) {
+			for (j = 0; j < i; j++)
+				percpu_counter_destroy(&bdi->bdi_stat[i]);
+			break;
+		}
+	}
+
+	return err;
+}
+EXPORT_SYMBOL(bdi_init);
+
+void bdi_destroy(struct backing_dev_info *bdi)
+{
+	int i;
+
+	for (i = 0; i < NR_BDI_STAT_ITEMS; i++)
+		percpu_counter_destroy(&bdi->bdi_stat[i]);
+}
+EXPORT_SYMBOL(bdi_destroy);
+
 static wait_queue_head_t congestion_wqh[2] = {
 		__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]),
 		__WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1])
-- 
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