Commit c5a6561b authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

iocost: add iocg_forgive_debt tracepoint 



Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent c7af2a00

block/blk-iocost.c

+12 −0
Original line number Diff line number Diff line
@@ -2046,12 +2046,24 @@ static void ioc_forgive_debts(struct ioc *ioc, u64 usage_us_sum, int nr_debtors, 
	ioc->dfgv_period_rem = do_div(nr_cycles, DFGV_PERIOD);



	list_for_each_entry(iocg, &ioc->active_iocgs, active_list) {

		u64 __maybe_unused old_debt, __maybe_unused old_delay;



		if (!iocg->abs_vdebt)

			continue;



		spin_lock(&iocg->waitq.lock);



		old_debt = iocg->abs_vdebt;

		old_delay = iocg->delay;



		iocg->abs_vdebt >>= nr_cycles;

		iocg->delay = 0; /* kick_waitq will recalc */

		iocg_kick_waitq(iocg, true, now);



		TRACE_IOCG_PATH(iocg_forgive_debt, iocg, now, usage_pct,

				old_debt, iocg->abs_vdebt,

				old_delay, iocg->delay);



		spin_unlock(&iocg->waitq.lock);

	}

}

include/trace/events/iocost.h

+41 −0
Original line number Diff line number Diff line
@@ -164,6 +164,47 @@ TRACE_EVENT(iocost_ioc_vrate_adj, 
	)

);



TRACE_EVENT(iocost_iocg_forgive_debt,



	TP_PROTO(struct ioc_gq *iocg, const char *path, struct ioc_now *now,

		u32 usage_pct, u64 old_debt, u64 new_debt,

		u64 old_delay, u64 new_delay),



	TP_ARGS(iocg, path, now, usage_pct,

		old_debt, new_debt, old_delay, new_delay),



	TP_STRUCT__entry (

		__string(devname, ioc_name(iocg->ioc))

		__string(cgroup, path)

		__field(u64, now)

		__field(u64, vnow)

		__field(u32, usage_pct)

		__field(u64, old_debt)

		__field(u64, new_debt)

		__field(u64, old_delay)

		__field(u64, new_delay)

	),



	TP_fast_assign(

		__assign_str(devname, ioc_name(iocg->ioc));

		__assign_str(cgroup, path);

		__entry->now = now->now;

		__entry->vnow = now->vnow;

		__entry->usage_pct = usage_pct;

		__entry->old_debt = old_debt;

		__entry->new_debt = new_debt;

		__entry->old_delay = old_delay;

		__entry->new_delay = new_delay;

	),



	TP_printk("[%s:%s] now=%llu:%llu usage=%u debt=%llu->%llu delay=%llu->%llu",

		__get_str(devname), __get_str(cgroup),

		__entry->now, __entry->vnow, __entry->usage_pct,

		__entry->old_debt, __entry->new_debt,

		__entry->old_delay, __entry->new_delay

	)

);



#endif /* _TRACE_BLK_IOCOST_H */



/* This part must be outside protection */