From: Aleksei Zakharov <zakharov.a.g@yandex.ru>
To: axboe@kernel.dk
Cc: linux-block@vger.kernel.org, Aleksei Zakharov <zakharov.a.g@yandex.ru>
Subject: [PATCH] block: avoid setting wbt_lat_usec to current value
Date: Mon, 11 Feb 2019 13:10:34 +0300 [thread overview]
Message-ID: <1549879834-24837-1-git-send-email-zakharov.a.g@yandex.ru> (raw)
There's no reason to set wbt min lat and freeze request queue
if current value is the same.
Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru>
---
block/blk-sysfs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 590d1ef..d0df883 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -468,6 +468,9 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
else if (val >= 0)
val *= 1000ULL;
+ if (wbt_get_min_lat(q) == val)
+ return count;
+
/*
* Ensure that the queue is idled, in case the latency update
* ends up either enabling or disabling wbt completely. We can't
--
2.7.4
next reply other threads:[~2019-02-11 10:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 10:10 Aleksei Zakharov [this message]
2019-02-11 10:31 ` [PATCH] block: avoid setting wbt_lat_usec to current value Johannes Thumshirn
2019-02-11 15:20 ` Jens Axboe
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