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mm: scalable bdi statistics counters

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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>
This commit is contained in:
Peter Zijlstra
2007-10-16 23:25:47 -07:00
committed by Linus Torvalds
parent e0bf68ddec
commit b2e8fb6efa
2 changed files with 109 additions and 3 deletions
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27
mm/backing-dev.c
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@@ -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])