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blk-mq: Record nr_active_requests per queue for when using shared sbitmap

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The per-hctx nr_active value can no longer be used to fairly assign a share
of tag depth per request queue for when using a shared sbitmap, as it does
not consider that the tags are shared tags over all hctx's.

For this case, record the nr_active_requests per request_queue, and make
the judgement based on that value.

Co-developed-with: Kashyap Desai <kashyap.desai@broadcom.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Don Brace<don.brace@microsemi.com> #SCSI resv cmds patches used
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry
2020-08-19 23:20:26 +08:00
committed by Jens Axboe
parent a0235d230f
commit bccf5e26d9
4 changed files with 30 additions and 4 deletions
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2
include/linux/blkdev.h
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@@ -485,6 +485,8 @@ struct request_queue {
struct timer_list timeout;
struct work_struct timeout_work;
atomic_t nr_active_requests_shared_sbitmap;
struct list_head icq_list;
#ifdef CONFIG_BLK_CGROUP
DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);