From: "hch@infradead.org" <hch@infradead.org>
To: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: "ming.lei@redhat.com" <ming.lei@redhat.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"hch@infradead.org" <hch@infradead.org>,
"jejb@linux.vnet.ibm.com" <jejb@linux.vnet.ibm.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"axboe@fb.com" <axboe@fb.com>,
"loberman@redhat.com" <loberman@redhat.com>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>
Subject: Re: [PATCH 04/14] blk-mq-sched: improve dispatching from sw queue
Date: Sat, 5 Aug 2017 01:40:49 -0700 [thread overview]
Message-ID: <20170805084048.GA6643@infradead.org> (raw)
In-Reply-To: <1501781583.2922.12.camel@wdc.com>
On Thu, Aug 03, 2017 at 05:33:13PM +0000, Bart Van Assche wrote:
> Are you aware that the SCSI core already keeps track of the number of busy requests
> per LUN? See also the device_busy member of struct scsi_device. How about giving the
> block layer core access in some way to that counter?
I'd love ot move it to blk-mq in a scalable way eventually, as
we'll run into the same problems with NVMe systems with multiple
namespaces.
next prev parent reply other threads:[~2017-08-05 8:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-31 16:50 [PATCH 00/14] blk-mq-sched: fix SCSI-MQ performance regression Ming Lei
2017-07-31 16:50 ` Ming Lei
2017-07-31 16:50 ` [PATCH 01/14] blk-mq-sched: fix scheduler bad performance Ming Lei
2017-07-31 23:00 ` Bart Van Assche
2017-07-31 16:50 ` [PATCH 02/14] blk-mq: rename flush_busy_ctx_data as ctx_iter_data Ming Lei
2017-07-31 23:03 ` Bart Van Assche
2017-07-31 16:51 ` [PATCH 03/14] blk-mq: introduce blk_mq_dispatch_rq_from_ctxs() Ming Lei
2017-07-31 23:09 ` Bart Van Assche
2017-08-01 10:07 ` Ming Lei
2017-08-02 17:19 ` kbuild test robot
2017-07-31 16:51 ` [PATCH 04/14] blk-mq-sched: improve dispatching from sw queue Ming Lei
2017-07-31 23:34 ` Bart Van Assche
2017-08-01 10:17 ` Ming Lei
2017-08-01 10:50 ` Ming Lei
2017-08-01 15:11 ` Bart Van Assche
2017-08-02 3:31 ` Ming Lei
2017-08-03 1:35 ` Bart Van Assche
2017-08-03 3:13 ` Ming Lei
2017-08-03 17:33 ` Bart Van Assche
2017-08-05 8:40 ` hch [this message]
2017-08-05 13:40 ` Ming Lei
2017-07-31 16:51 ` [PATCH 05/14] blk-mq-sched: don't dequeue request until all in ->dispatch are flushed Ming Lei
2017-07-31 23:42 ` Bart Van Assche
2017-08-01 10:44 ` Ming Lei
2017-08-01 16:14 ` Bart Van Assche
2017-08-02 3:01 ` Ming Lei
2017-08-03 1:33 ` Bart Van Assche
2017-07-31 16:51 ` [PATCH 06/14] blk-mq-sched: introduce blk_mq_sched_queue_depth() Ming Lei
2017-07-31 16:51 ` [PATCH 07/14] blk-mq-sched: use q->queue_depth as hint for q->nr_requests Ming Lei
2017-07-31 16:51 ` [PATCH 08/14] blk-mq: introduce BLK_MQ_F_SHARED_DEPTH Ming Lei
2017-07-31 16:51 ` [PATCH 09/14] blk-mq-sched: cleanup blk_mq_sched_dispatch_requests() Ming Lei
2017-07-31 16:51 ` [PATCH 10/14] blk-mq-sched: introduce helpers for query, change busy state Ming Lei
2017-07-31 16:51 ` [PATCH 11/14] blk-mq: introduce helpers for operating ->dispatch list Ming Lei
2017-07-31 16:51 ` [PATCH 12/14] blk-mq: introduce pointers to dispatch lock & list Ming Lei
2017-07-31 16:51 ` [PATCH 13/14] blk-mq: pass 'request_queue *' to several helpers of operating BUSY Ming Lei
2017-07-31 16:51 ` [PATCH 14/14] blk-mq-sched: improve IO scheduling on SCSI devcie Ming Lei
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