writeback: initialize global_dirty_limit

This prevents global_dirty_limit from remaining 0 (the initial value) for long time, since it's only updated in update_dirty_limit() when above the dirty freerun area. It will avoid unexpected consequences when some random code use it as a convenient approximation of the global dirty threshold. Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

writeback: initialize global_dirty_limit
This prevents global_dirty_limit from remaining 0 (the initial value) for long time, since it's only updated in update_dirty_limit() when above the dirty freerun area. It will avoid unexpected consequences when some random code use it as a convenient approximation of the global dirty threshold. Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Fengguang Wu
1 parent 4cd9069a0a
Showing 1 changed file with 1 additions and 0 deletions Side-by-side Diff
mm/page-writeback.c
@@ -1568,6 +1568,7 @@
 	unsigned long background_thresh;
 	unsigned long dirty_thresh;
 	global_dirty_limits(&background_thresh, &dirty_thresh);
+	global_dirty_limit = dirty_thresh;
 	ratelimit_pages = dirty_thresh / (num_online_cpus() * 32);
 	if (ratelimit_pages < 16)
 		ratelimit_pages = 16;
...	...	@@ -1568,6 +1568,7 @@
1568	1568	unsigned long background_thresh;
1569	1569	unsigned long dirty_thresh;
1570	1570	global_dirty_limits(&background_thresh, &dirty_thresh);
	1571	+ global_dirty_limit = dirty_thresh;
1571	1572	ratelimit_pages = dirty_thresh / (num_online_cpus() * 32);
1572	1573	if (ratelimit_pages < 16)
1573	1574	ratelimit_pages = 16;