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-rw-r--r--mm/page-writeback.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 622a18c114ca..c518c845f202 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1976,7 +1976,16 @@ int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
int ret;
ret = proc_dointvec(table, write, buffer, length, ppos);
- if (!ret && !old_interval && dirty_writeback_interval)
+
+ /*
+ * Writing 0 to dirty_writeback_interval will disable periodic writeback
+ * and a different non-zero value will wakeup the writeback threads.
+ * wb_wakeup_delayed() would be more appropriate, but it's a pain to
+ * iterate over all bdis and wbs.
+ * The reason we do this is to make the change take effect immediately.
+ */
+ if (!ret && write && dirty_writeback_interval &&
+ dirty_writeback_interval != old_interval)
wakeup_flusher_threads(WB_REASON_PERIODIC);
return ret;