[PATCH 1/3] bcache: add cond_resched() in __bch_cache_cmp()

[Coly Li <colyli@xxxxxxx>]

From: Shile Zhang <shile.zhang@xxxxxxxxxxxxxxxxx>

Read /sys/fs/bcache/<uuid>/cacheN/priority_stats can take very long
time with huge cache after long run.

Signed-off-by: Shile Zhang <shile.zhang@xxxxxxxxxxxxxxxxx>
Tested-by: Heitor Alves de Siqueira <halves@xxxxxxxxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
---
 drivers/md/bcache/sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index e2059af90791..627dcea0f5b6 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -964,6 +964,7 @@ KTYPE(bch_cache_set_internal);
 
 static int __bch_cache_cmp(const void *l, const void *r)
 {
+	cond_resched();
 	return *((uint16_t *)r) - *((uint16_t *)l);
 }
 
-- 
2.16.4