- __wb_update_bandwidth(&gdtc, NULL, start_time, false);
+ __wb_update_bandwidth(&gdtc, NULL, false);
+}
+
+/* Interval after which we consider wb idle and don't estimate bandwidth */
+#define WB_BANDWIDTH_IDLE_JIF (HZ)
+
+static void wb_bandwidth_estimate_start(struct bdi_writeback *wb)
+{
+ unsigned long now = jiffies;
+ unsigned long elapsed = now - READ_ONCE(wb->bw_time_stamp);
+
+ if (elapsed > WB_BANDWIDTH_IDLE_JIF &&
+ !atomic_read(&wb->writeback_inodes)) {
+ spin_lock(&wb->list_lock);
+ wb->dirtied_stamp = wb_stat(wb, WB_DIRTIED);
+ wb->written_stamp = wb_stat(wb, WB_WRITTEN);
+ WRITE_ONCE(wb->bw_time_stamp, now);
+ spin_unlock(&wb->list_lock);
+ }