From: Baolin Wang <baolin.wang@linux.alibaba.com>
To: tj@kernel.org, axboe@kernel.dk
Cc: baolin.wang@linux.alibaba.com, baolin.wang7@gmail.com,
linux-block@vger.kernel.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 3/4] blk-throttle: Avoid tracking latency if low limit is invalid
Date: Sun, 20 Sep 2020 17:14:26 +0800 [thread overview]
Message-ID: <a244c9973c6fc0081dba4142625840696b386a0f.1600592693.git.baolin.wang@linux.alibaba.com> (raw)
In-Reply-To: <cover.1600592693.git.baolin.wang@linux.alibaba.com>
The IO latency tracking is only for LOW limit, so we should add a
validation to avoid redundant latency tracking if the LOW limit
is not valid.
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
block/blk-throttle.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 7e72102..b0d8f7c 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2100,7 +2100,7 @@ static void throtl_update_latency_buckets(struct throtl_data *td)
unsigned long last_latency[2] = { 0 };
unsigned long latency[2];
- if (!blk_queue_nonrot(td->queue))
+ if (!blk_queue_nonrot(td->queue) || !td->limit_valid[LIMIT_LOW])
return;
if (time_before(jiffies, td->last_calculate_time + HZ))
return;
@@ -2338,6 +2338,8 @@ void blk_throtl_bio_endio(struct bio *bio)
if (!blkg)
return;
tg = blkg_to_tg(blkg);
+ if (!tg->td->limit_valid[LIMIT_LOW])
+ return;
finish_time_ns = ktime_get_ns();
tg->last_finish_time = finish_time_ns >> 10;
--
1.8.3.1
next prev parent reply other threads:[~2020-09-20 9:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-20 9:10 [PATCH 0/4] Some improvements for blk throttle Baolin Wang
2020-09-20 9:10 ` [PATCH 1/4] blk-throttle: Remove a meaningless parameter for throtl_downgrade_state() Baolin Wang
2020-09-20 9:10 ` [PATCH 2/4] blk-throttle: Avoid getting the current time if tg->last_finish_time is 0 Baolin Wang
2020-09-20 9:14 ` Baolin Wang [this message]
2020-09-20 9:14 ` [PATCH 4/4] blk-throttle: Fix IO hang for a corner case Baolin Wang
2020-09-29 14:52 ` [PATCH 0/4] Some improvements for blk throttle Baolin Wang
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