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authorBart Van Assche <bvanassche@acm.org>2024-03-13 22:42:18 +0100
committerJens Axboe <axboe@kernel.dk>2024-03-13 22:56:14 +0100
commit256aab46e31683d76d45ccbedc287b4d3f3e322b (patch)
tree68f53d685ad63a8239a06b258b1035ef2e7a9032 /block
parentblock: limit block time caching to in_task() context (diff)
downloadlinux-256aab46e31683d76d45ccbedc287b4d3f3e322b.tar.xz
linux-256aab46e31683d76d45ccbedc287b4d3f3e322b.zip
Revert "block/mq-deadline: use correct way to throttling write requests"
The code "max(1U, 3 * (1U << shift) / 4)" comes from the Kyber I/O scheduler. The Kyber I/O scheduler maintains one internal queue per hwq and hence derives its async_depth from the number of hwq tags. Using this approach for the mq-deadline scheduler is wrong since the mq-deadline scheduler maintains one internal queue for all hwqs combined. Hence this revert. Cc: stable@vger.kernel.org Cc: Damien Le Moal <dlemoal@kernel.org> Cc: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com> Cc: Zhiguo Niu <Zhiguo.Niu@unisoc.com> Fixes: d47f9717e5cf ("block/mq-deadline: use correct way to throttling write requests") Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20240313214218.1736147-1-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/mq-deadline.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/block/mq-deadline.c b/block/mq-deadline.c
index f958e79277b8..02a916ba62ee 100644
--- a/block/mq-deadline.c
+++ b/block/mq-deadline.c
@@ -646,9 +646,8 @@ static void dd_depth_updated(struct blk_mq_hw_ctx *hctx)
struct request_queue *q = hctx->queue;
struct deadline_data *dd = q->elevator->elevator_data;
struct blk_mq_tags *tags = hctx->sched_tags;
- unsigned int shift = tags->bitmap_tags.sb.shift;
- dd->async_depth = max(1U, 3 * (1U << shift) / 4);
+ dd->async_depth = max(1UL, 3 * q->nr_requests / 4);
sbitmap_queue_min_shallow_depth(&tags->bitmap_tags, dd->async_depth);
}