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-rw-r--r--mm/backing-dev.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 9c1c199f88ce..a9a08d88a745 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -439,10 +439,17 @@ static int bdi_forker_thread(void *ptr)
break;
case NO_ACTION:
- if (dirty_writeback_interval)
- schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
+ if (!wb_has_dirty_io(me) || !dirty_writeback_interval)
+ /*
+ * There are no dirty data. The only thing we
+ * should now care about is checking for
+ * inactive bdi threads and killing them. Thus,
+ * let's sleep for longer time, save energy and
+ * be friendly for battery-driven devices.
+ */
+ schedule_timeout(bdi_longest_inactive());
else
- schedule();
+ schedule_timeout(msecs_to_jiffies(dirty_writeback_interval * 10));
try_to_freeze();
/* Back to the main loop */
continue;