From: Jens Axboe <axboe@kernel.dk>
To: Hannes Reinecke <hare@suse.de>,
"Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>,
James Bottomley <james.bottomley@hansenpartnership.com>,
Ming Lei <ming.lei@redhat.com>,
Bart van Assche <bvanassche@acm.org>,
John Garry <john.garry@huawei.com>,
linux-scsi@vger.kernel.org, linux-block@vger.kernel.org
Subject: Re: [PATCH 3/8] blk-mq: Use a pointer for sbitmap
Date: Tue, 26 Nov 2019 08:14:13 -0700 [thread overview]
Message-ID: <8f0522ee-2a81-c2ae-d111-3ff89ee6f93e@kernel.dk> (raw)
In-Reply-To: <20191126091416.20052-4-hare@suse.de>
On 11/26/19 2:14 AM, Hannes Reinecke wrote:
> Instead of allocating the tag bitmap in place we should be using a
> pointer. This is in preparation for shared host-wide bitmaps.
Not a huge fan of this, it's an extra indirection in the hot path
of both submission and completion.
--
Jens Axboe
next prev parent reply other threads:[~2019-11-26 15:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 9:14 [PATCH RFC v3 0/8] blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs Hannes Reinecke
2019-11-26 9:14 ` [PATCH 1/8] blk-mq: Remove some unused function arguments Hannes Reinecke
2019-11-26 9:14 ` [PATCH 2/8] blk-mq: rename BLK_MQ_F_TAG_SHARED as BLK_MQ_F_TAG_QUEUE_SHARED Hannes Reinecke
2019-11-26 9:14 ` [PATCH 3/8] blk-mq: Use a pointer for sbitmap Hannes Reinecke
2019-11-26 15:14 ` Jens Axboe [this message]
2019-11-26 16:54 ` John Garry
2019-11-26 17:11 ` Jens Axboe
2019-11-26 17:23 ` John Garry
2019-11-26 17:25 ` Jens Axboe
2019-11-26 18:08 ` John Garry
2019-11-27 1:46 ` Jens Axboe
2019-11-27 13:05 ` John Garry
2019-11-27 13:12 ` Hannes Reinecke
2019-11-27 14:20 ` Jens Axboe
2019-11-27 14:21 ` Jens Axboe
2019-11-27 14:44 ` John Garry
2019-11-27 16:52 ` Hannes Reinecke
2019-11-27 18:02 ` John Garry
2019-11-26 9:14 ` [PATCH 4/8] blk-mq: Facilitate a shared sbitmap per tagset Hannes Reinecke
2019-11-26 11:05 ` Ming Lei
2019-11-26 11:27 ` Hannes Reinecke
2019-11-26 11:50 ` John Garry
2019-11-26 15:54 ` Ming Lei
2019-11-27 17:02 ` Hannes Reinecke
2019-11-29 0:25 ` Ming Lei
2019-11-29 9:21 ` John Garry
2019-11-26 9:14 ` [PATCH 5/8] scsi: Add template flag 'host_tagset' Hannes Reinecke
2019-11-26 9:14 ` [PATCH 6/8] scsi: hisi_sas: Switch v3 hw to MQ Hannes Reinecke
2019-11-26 9:14 ` [PATCH 7/8] smartpqi: enable host tagset Hannes Reinecke
2019-11-26 9:14 ` [PATCH 8/8] hpsa: switch to using blk-mq Hannes Reinecke
2019-11-26 10:09 ` [PATCH RFC v3 0/8] blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs John Garry
2019-11-26 13:10 [PATCH RFC v4 " Hannes Reinecke
2019-11-26 13:10 ` [PATCH 3/8] blk-mq: Use a pointer for sbitmap Hannes Reinecke
2019-11-26 16:42 ` Christoph Hellwig
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