[PATCH 24/27] writeback: trace global_dirty_state

[Wu Fengguang]

Add trace balance_dirty_state for showing the global dirty page counts
and thresholds at each balance_dirty_pages() loop.

Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
 include/trace/events/writeback.h |   48 +++++++++++++++++++++++++++++
 mm/page-writeback.c              |    1 
 2 files changed, 49 insertions(+)

--- linux-next.orig/mm/page-writeback.c	2011-03-03 14:02:58.000000000 +0800
+++ linux-next/mm/page-writeback.c	2011-03-03 14:03:24.000000000 +0800
@@ -386,6 +386,7 @@ void global_dirty_limits(unsigned long *
 	tsk = current;
 	*pbackground = background;
 	*pdirty = dirty;
+	trace_global_dirty_state(background, dirty);
 }
 EXPORT_SYMBOL_GPL(global_dirty_limits);
 
--- linux-next.orig/include/trace/events/writeback.h	2011-03-03 14:02:58.000000000 +0800
+++ linux-next/include/trace/events/writeback.h	2011-03-03 14:03:24.000000000 +0800
@@ -287,6 +287,54 @@ TRACE_EVENT(balance_dirty_pages,
 		  )
 );
 
+TRACE_EVENT(global_dirty_state,
+
+	TP_PROTO(unsigned long background_thresh,
+		 unsigned long dirty_thresh
+	),
+
+	TP_ARGS(background_thresh,
+		dirty_thresh
+	),
+
+	TP_STRUCT__entry(
+		__field(unsigned long,	nr_dirty)
+		__field(unsigned long,	nr_writeback)
+		__field(unsigned long,	nr_unstable)
+		__field(unsigned long,	background_thresh)
+		__field(unsigned long,	dirty_thresh)
+		__field(unsigned long,	poll_thresh)
+		__field(unsigned long,	nr_dirtied)
+		__field(unsigned long,	nr_written)
+	),
+
+	TP_fast_assign(
+		__entry->nr_dirty	= global_page_state(NR_FILE_DIRTY);
+		__entry->nr_writeback	= global_page_state(NR_WRITEBACK);
+		__entry->nr_unstable	= global_page_state(NR_UNSTABLE_NFS);
+		__entry->nr_dirtied	= global_page_state(NR_DIRTIED);
+		__entry->nr_written	= global_page_state(NR_WRITTEN);
+		__entry->background_thresh	= background_thresh;
+		__entry->dirty_thresh		= dirty_thresh;
+		__entry->poll_thresh		= current->nr_dirtied_pause;
+	),
+
+	TP_printk("dirty=%lu writeback=%lu unstable=%lu "
+		  "bg_thresh=%lu thresh=%lu gap=%ld poll=%ld "
+		  "dirtied=%lu written=%lu",
+		  __entry->nr_dirty,
+		  __entry->nr_writeback,
+		  __entry->nr_unstable,
+		  __entry->background_thresh,
+		  __entry->dirty_thresh,
+		  __entry->dirty_thresh - __entry->nr_dirty -
+		  __entry->nr_writeback - __entry->nr_unstable,
+		  __entry->poll_thresh,
+		  __entry->nr_dirtied,
+		  __entry->nr_written
+	)
+);
+
 DECLARE_EVENT_CLASS(writeback_congest_waited_template,
 
 	TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),


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