ANDROID: vendor_hooks: add hook to balance_dirty_pages()

Add vendor hook in order to track which process cause dirty page write
back pressure.

Bug: 188096764
Change-Id: I890299c97d7a8cf791f20d16d8d53b4615679b9e
Signed-off-by: Yang Yang <yang.yang@vivo.com>

mm/page-writeback.c

@@ -42,6 +42,9 @@
 
 #include "internal.h"
 
+#undef CREATE_TRACE_POINT
+#include <trace/hooks/mm.h>
+
 /*
  * Sleep at most 200ms at a time in balance_dirty_pages().
  */
@@ -1625,6 +1628,9 @@ static void balance_dirty_pages(struct bdi_writeback *wb,
 			}
 		}
 
+		trace_android_vh_mm_dirty_limits(gdtc, strictlimit, dirty, bg_thresh,
+				nr_reclaimable, pages_dirtied);
+
 		/*
 		 * Throttle it only when the background writeback cannot
 		 * catch-up. This avoids (excessively) small writeouts