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Commit b48c104d authored by Wu Fengguang's avatar Wu Fengguang
Browse files

writeback: trace event bdi_dirty_ratelimit 



It helps understand how various throttle bandwidths are updated.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
parent 50657fc4

include/trace/events/writeback.h

+45 −0
Original line number Diff line number Diff line
@@ -226,6 +226,51 @@ TRACE_EVENT(global_dirty_state, 
	)

);



#define KBps(x)			((x) << (PAGE_SHIFT - 10))



TRACE_EVENT(bdi_dirty_ratelimit,



	TP_PROTO(struct backing_dev_info *bdi,

		 unsigned long dirty_rate,

		 unsigned long task_ratelimit),



	TP_ARGS(bdi, dirty_rate, task_ratelimit),



	TP_STRUCT__entry(

		__array(char,		bdi, 32)

		__field(unsigned long,	write_bw)

		__field(unsigned long,	avg_write_bw)

		__field(unsigned long,	dirty_rate)

		__field(unsigned long,	dirty_ratelimit)

		__field(unsigned long,	task_ratelimit)

		__field(unsigned long,	balanced_dirty_ratelimit)

	),



	TP_fast_assign(

		strlcpy(__entry->bdi, dev_name(bdi->dev), 32);

		__entry->write_bw	= KBps(bdi->write_bandwidth);

		__entry->avg_write_bw	= KBps(bdi->avg_write_bandwidth);

		__entry->dirty_rate	= KBps(dirty_rate);

		__entry->dirty_ratelimit = KBps(bdi->dirty_ratelimit);

		__entry->task_ratelimit	= KBps(task_ratelimit);

		__entry->balanced_dirty_ratelimit =

					  KBps(bdi->balanced_dirty_ratelimit);

	),



	TP_printk("bdi %s: "

		  "write_bw=%lu awrite_bw=%lu dirty_rate=%lu "

		  "dirty_ratelimit=%lu task_ratelimit=%lu "

		  "balanced_dirty_ratelimit=%lu",

		  __entry->bdi,

		  __entry->write_bw,		/* write bandwidth */

		  __entry->avg_write_bw,	/* avg write bandwidth */

		  __entry->dirty_rate,		/* bdi dirty rate */

		  __entry->dirty_ratelimit,	/* base ratelimit */

		  __entry->task_ratelimit, /* ratelimit with position control */

		  __entry->balanced_dirty_ratelimit /* the balanced ratelimit */

	)

);



DECLARE_EVENT_CLASS(writeback_congest_waited_template,



	TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),

mm/page-writeback.c

+2 −0
Original line number Diff line number Diff line
@@ -875,6 +875,8 @@ static void bdi_update_dirty_ratelimit(struct backing_dev_info *bdi, 


	bdi->dirty_ratelimit = max(dirty_ratelimit, 1UL);

	bdi->balanced_dirty_ratelimit = balanced_dirty_ratelimit;



	trace_bdi_dirty_ratelimit(bdi, dirty_rate, task_ratelimit);

}



void __bdi_update_bandwidth(struct backing_dev_info *bdi,