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Message-Id: <20190724191718.027335460@linuxfoundation.org>
Date: Wed, 24 Jul 2019 21:22:15 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 4.19 266/271] blk-throttle: fix zero wait time for iops throttled group
From: Konstantin Khlebnikov <khlebnikov@...dex-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@...dex-team.ru>
Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
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