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iocost: add iocg_forgive_debt tracepoint

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Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2020-09-17 20:44:56 -04:00
committed by Jens Axboe
parent c7af2a003a
commit c5a6561b8d
2 changed files with 53 additions and 0 deletions
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12
block/blk-iocost.c
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@@ -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);
}
}