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authorWu Fengguang <fengguang.wu@intel.com>2010-08-29 23:33:20 -0600
committerWu Fengguang <fengguang.wu@intel.com>2011-10-31 00:29:38 +0800
commitece13ac31bbe492d940ba0bc4ade2ae1521f46a5 (patch)
tree2bfddab0f62999bf595a72913b79cabafbad0e40 /mm/page-writeback.c
parentb48c104d2211b0ac881a71f5f76a3816225f8111 (diff)
writeback: trace event balance_dirty_pages
Useful for analyzing the dynamics of the throttling algorithms and debugging user reported problems. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm/page-writeback.c')
-rw-r--r--mm/page-writeback.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e3c2d8bf87bb..45d36f7dc169 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1103,12 +1103,34 @@ static void balance_dirty_pages(struct address_space *mapping,
pos_ratio >> RATELIMIT_CALC_SHIFT;
pause = (HZ * pages_dirtied) / (task_ratelimit | 1);
if (unlikely(pause <= 0)) {
+ trace_balance_dirty_pages(bdi,
+ dirty_thresh,
+ background_thresh,
+ nr_dirty,
+ bdi_thresh,
+ bdi_dirty,
+ dirty_ratelimit,
+ task_ratelimit,
+ pages_dirtied,
+ pause,
+ start_time);
pause = 1; /* avoid resetting nr_dirtied_pause below */
break;
}
pause = min(pause, max_pause);
pause:
+ trace_balance_dirty_pages(bdi,
+ dirty_thresh,
+ background_thresh,
+ nr_dirty,
+ bdi_thresh,
+ bdi_dirty,
+ dirty_ratelimit,
+ task_ratelimit,
+ pages_dirtied,
+ pause,
+ start_time);
__set_current_state(TASK_UNINTERRUPTIBLE);
io_schedule_timeout(pause);