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authorTejun Heo <tj@kernel.org>2020-09-18 03:44:56 +0300
committerJens Axboe <axboe@kernel.dk>2020-09-25 17:35:02 +0300
commitc5a6561b8d99ea7d8df21308249ce05bce3dd466 (patch)
tree375d70f7fd4bfcee50cf07ea43735fbd98611d62 /block/blk-iocost.c
parentc7af2a003a411853fc9c805efe96d10dcc8adb5f (diff)
downloadlinux-c5a6561b8d99ea7d8df21308249ce05bce3dd466.tar.xz
iocost: add iocg_forgive_debt tracepoint
Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-iocost.c')
-rw-r--r--block/blk-iocost.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 9b1f94499432..328ae805e85f 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -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);
}
}