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Commit e1cbe236 authored by Wu Fengguang's avatar Wu Fengguang
Browse files

writeback: trace global_dirty_state 



Add trace event balance_dirty_state for showing the global dirty page
counts and thresholds at each global_dirty_limits() invocation.  This
will cover the callers throttle_vm_writeout(), over_bground_thresh()
and each balance_dirty_pages() loop.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
parent ffd1f609

include/trace/events/writeback.h

+46 −0
Original line number Original line Diff line number Diff line
@@ -204,6 +204,52 @@ TRACE_EVENT(writeback_queue_io, 
		__entry->moved)

		__entry->moved)

);

);





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,	dirty_limit)

		__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->dirty_limit = global_dirty_limit;

	),



	TP_printk("dirty=%lu writeback=%lu unstable=%lu "

		  "bg_thresh=%lu thresh=%lu limit=%lu "

		  "dirtied=%lu written=%lu",

		  __entry->nr_dirty,

		  __entry->nr_writeback,

		  __entry->nr_unstable,

		  __entry->background_thresh,

		  __entry->dirty_thresh,

		  __entry->dirty_limit,

		  __entry->nr_dirtied,

		  __entry->nr_written

	)

);



DECLARE_EVENT_CLASS(writeback_congest_waited_template,

DECLARE_EVENT_CLASS(writeback_congest_waited_template,





	TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),

	TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),

mm/page-writeback.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -447,6 +447,7 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty) 
	}

	}

	*pbackground = background;

	*pbackground = background;

	*pdirty = dirty;

	*pdirty = dirty;

	trace_global_dirty_state(background, dirty);

}

}





/**

/**