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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 /include/trace
parentb48c104d2211b0ac881a71f5f76a3816225f8111 (diff)
downloadlinux-linaro-stable-ece13ac31bbe492d940ba0bc4ade2ae1521f46a5.tar.gz
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 'include/trace')
-rw-r--r--include/trace/events/writeback.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index ffb5deb77ca9..0ce9f06f58c2 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -271,6 +271,79 @@ TRACE_EVENT(bdi_dirty_ratelimit,
)
);
+TRACE_EVENT(balance_dirty_pages,
+
+ TP_PROTO(struct backing_dev_info *bdi,
+ unsigned long thresh,
+ unsigned long bg_thresh,
+ unsigned long dirty,
+ unsigned long bdi_thresh,
+ unsigned long bdi_dirty,
+ unsigned long dirty_ratelimit,
+ unsigned long task_ratelimit,
+ unsigned long dirtied,
+ long pause,
+ unsigned long start_time),
+
+ TP_ARGS(bdi, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,
+ dirty_ratelimit, task_ratelimit,
+ dirtied, pause, start_time),
+
+ TP_STRUCT__entry(
+ __array( char, bdi, 32)
+ __field(unsigned long, limit)
+ __field(unsigned long, setpoint)
+ __field(unsigned long, dirty)
+ __field(unsigned long, bdi_setpoint)
+ __field(unsigned long, bdi_dirty)
+ __field(unsigned long, dirty_ratelimit)
+ __field(unsigned long, task_ratelimit)
+ __field(unsigned int, dirtied)
+ __field(unsigned int, dirtied_pause)
+ __field(unsigned long, paused)
+ __field( long, pause)
+ ),
+
+ TP_fast_assign(
+ unsigned long freerun = (thresh + bg_thresh) / 2;
+ strlcpy(__entry->bdi, dev_name(bdi->dev), 32);
+
+ __entry->limit = global_dirty_limit;
+ __entry->setpoint = (global_dirty_limit + freerun) / 2;
+ __entry->dirty = dirty;
+ __entry->bdi_setpoint = __entry->setpoint *
+ bdi_thresh / (thresh + 1);
+ __entry->bdi_dirty = bdi_dirty;
+ __entry->dirty_ratelimit = KBps(dirty_ratelimit);
+ __entry->task_ratelimit = KBps(task_ratelimit);
+ __entry->dirtied = dirtied;
+ __entry->dirtied_pause = current->nr_dirtied_pause;
+ __entry->pause = pause * 1000 / HZ;
+ __entry->paused = (jiffies - start_time) * 1000 / HZ;
+ ),
+
+
+ TP_printk("bdi %s: "
+ "limit=%lu setpoint=%lu dirty=%lu "
+ "bdi_setpoint=%lu bdi_dirty=%lu "
+ "dirty_ratelimit=%lu task_ratelimit=%lu "
+ "dirtied=%u dirtied_pause=%u "
+ "paused=%lu pause=%ld",
+ __entry->bdi,
+ __entry->limit,
+ __entry->setpoint,
+ __entry->dirty,
+ __entry->bdi_setpoint,
+ __entry->bdi_dirty,
+ __entry->dirty_ratelimit,
+ __entry->task_ratelimit,
+ __entry->dirtied,
+ __entry->dirtied_pause,
+ __entry->paused, /* ms */
+ __entry->pause /* ms */
+ )
+);
+
DECLARE_EVENT_CLASS(writeback_congest_waited_template,
TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),