writeback: Add tracing to balance_dirty_pages

[mv-sheeva.git] / mm / page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 37498ef6154836943f3478304bf7440ab255669a..d556cd829af66ab6431334bafb2d5b1e8a583334 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -34,6 +34,7 @@
 #include <linux/syscalls.h>
 #include <linux/buffer_head.h>
 #include <linux/pagevec.h>
+#include <trace/events/writeback.h>
 
 /*
  * After a CPU has dirtied this many pages, balance_dirty_pages_ratelimited
@@ -535,11 +536,13 @@ static void balance_dirty_pages(struct address_space *mapping,
                 * threshold otherwise wait until the disk writes catch
                 * up.
                 */
+               trace_wbc_balance_dirty_start(&wbc, bdi);
                if (bdi_nr_reclaimable > bdi_thresh) {
                        writeback_inodes_wb(&bdi->wb, &wbc);
                        pages_written += write_chunk - wbc.nr_to_write;
                        get_dirty_limits(&background_thresh, &dirty_thresh,
                                       &bdi_thresh, bdi);
+                       trace_wbc_balance_dirty_written(&wbc, bdi);
                }
 
                /*
@@ -565,6 +568,7 @@ static void balance_dirty_pages(struct address_space *mapping,
                if (pages_written >= write_chunk)
                        break;          /* We've done our duty */
 
+               trace_wbc_balance_dirty_wait(&wbc, bdi);
                __set_current_state(TASK_INTERRUPTIBLE);
                io_schedule_timeout(pause);