writeback: skip tmpfs early in balance_dirty_pages_ratelimited_nr()
This helps prevent tmpfs dirtiers from skewing the per-cpu bdp_ratelimits.
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index b2529f8..1965d05 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -490,9 +490,6 @@
bool dirty_exceeded = false;
struct backing_dev_info *bdi = mapping->backing_dev_info;
- if (!bdi_cap_account_dirty(bdi))
- return;
-
for (;;) {
struct writeback_control wbc = {
.sync_mode = WB_SYNC_NONE,
@@ -631,9 +628,13 @@
void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
unsigned long nr_pages_dirtied)
{
+ struct backing_dev_info *bdi = mapping->backing_dev_info;
unsigned long ratelimit;
unsigned long *p;
+ if (!bdi_cap_account_dirty(bdi))
+ return;
+
ratelimit = ratelimit_pages;
if (mapping->backing_dev_info->dirty_exceeded)
ratelimit = 8;