linux-kernel - [PATCH 2/2] blk-iocost: only flush wait and indebt stat deltas when needed

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Date:   Wed,  1 Jun 2022 20:20:07 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     tj@...nel.org, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH 2/2] blk-iocost: only flush wait and indebt stat deltas when needed

We only need to flush wait and indebt stat deltas when the iocg
is in these status.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 block/blk-iocost.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index b1f2305e8032..502425b44475 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2174,28 +2174,28 @@ static int ioc_check_iocgs(struct ioc *ioc, struct ioc_now *now)
 
 		spin_lock(&iocg->waitq.lock);
 
-		/* flush wait and indebt stat deltas */
-		if (iocg->wait_since) {
-			iocg->stat.wait_us += now->now - iocg->wait_since;
-			iocg->wait_since = now->now;
-		}
-		if (iocg->indebt_since) {
-			iocg->stat.indebt_us +=
-				now->now - iocg->indebt_since;
-			iocg->indebt_since = now->now;
-		}
-		if (iocg->indelay_since) {
-			iocg->stat.indelay_us +=
-				now->now - iocg->indelay_since;
-			iocg->indelay_since = now->now;
-		}
-
 		if (waitqueue_active(&iocg->waitq) || iocg->abs_vdebt ||
 		    iocg->delay) {
 			/* might be oversleeping vtime / hweight changes, kick */
 			iocg_kick_waitq(iocg, true, now);
 			if (iocg->abs_vdebt || iocg->delay)
 				nr_debtors++;
+
+			/* flush wait and indebt stat deltas */
+			if (iocg->wait_since) {
+				iocg->stat.wait_us += now->now - iocg->wait_since;
+				iocg->wait_since = now->now;
+			}
+			if (iocg->indebt_since) {
+				iocg->stat.indebt_us +=
+					now->now - iocg->indebt_since;
+				iocg->indebt_since = now->now;
+			}
+			if (iocg->indelay_since) {
+				iocg->stat.indelay_us +=
+					now->now - iocg->indelay_since;
+				iocg->indelay_since = now->now;
+			}
 		} else if (iocg_is_idle(iocg))
 			iocg_deactivate(iocg, now);
 
-- 
2.36.1