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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.19 266/271] blk-throttle: fix zero wait time for iops throttled group
Date:   Wed, 24 Jul 2019 21:22:15 +0200
Message-Id: <20190724191718.027335460@linuxfoundation.org>
In-Reply-To: <20190724191655.268628197@linuxfoundation.org>
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From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>

commit 3a10f999ffd464d01c5a05592a15470a3c4bbc36 upstream.

After commit 991f61fe7e1d ("Blk-throttle: reduce tail io latency when
iops limit is enforced") wait time could be zero even if group is
throttled and cannot issue requests right now. As a result
throtl_select_dispatch() turns into busy-loop under irq-safe queue
spinlock.

Fix is simple: always round up target time to the next throttle slice.

Fixes: 991f61fe7e1d ("Blk-throttle: reduce tail io latency when iops limit is enforced")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 block/blk-throttle.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -892,13 +892,10 @@ static bool tg_with_in_iops_limit(struct
 	unsigned long jiffy_elapsed, jiffy_wait, jiffy_elapsed_rnd;
 	u64 tmp;
 
-	jiffy_elapsed = jiffy_elapsed_rnd = jiffies - tg->slice_start[rw];
+	jiffy_elapsed = jiffies - tg->slice_start[rw];
 
-	/* Slice has just started. Consider one slice interval */
-	if (!jiffy_elapsed)
-		jiffy_elapsed_rnd = tg->td->throtl_slice;
-
-	jiffy_elapsed_rnd = roundup(jiffy_elapsed_rnd, tg->td->throtl_slice);
+	/* Round up to the next throttle slice, wait time must be nonzero */
+	jiffy_elapsed_rnd = roundup(jiffy_elapsed + 1, tg->td->throtl_slice);
 
 	/*
 	 * jiffy_elapsed_rnd should not be a big value as minimum iops can be