It's just a waste of time, because ub0 has no ub-specific dirty limits.
balance_dirty_pages handles ub0 case anyway.
Signed-off-by: Vladimir Davydov <vdavy...@virtuozzo.com>
---
mm/page-writeback.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 9940d5fe7dcb..ba5f93a84fca 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1403,9 +1403,11 @@ static void balance_dirty_pages_ub(struct address_space
*mapping,
unsigned long pages_written = 0;
unsigned long pause = 1;
struct user_beancounter *ub = get_io_ub();
-
struct backing_dev_info *bdi = mapping->backing_dev_info;
+ if (ub == get_ub0())
+ return;
+
for (;;) {
unsigned long nr_to_write = write_chunk - pages_written;
--
2.1.4
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