From: John Garry <john.garry@huawei.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"jejb@linux.ibm.com" <jejb@linux.ibm.com>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"kashyap.desai@broadcom.com" <kashyap.desai@broadcom.com>,
"hare@suse.de" <hare@suse.de>
Subject: Re: [PATCH v2 10/11] blk-mq: Use shared tags for shared sbitmap support
Date: Mon, 23 Aug 2021 09:55:44 +0100 [thread overview]
Message-ID: <a46c6365-7423-cab0-896b-621af85b3f99@huawei.com> (raw)
In-Reply-To: <YRzB+aCVVSP+OmE4@T590>
On 18/08/2021 09:16, Ming Lei wrote:
>> ret = blk_mq_alloc_rqs(set, tags, 0, set->queue_depth);
>> + if (ret) {
>> + blk_mq_exit_sched_shared_sbitmap(queue);
>> + return ret;
> There are two such patterns for allocate rq map and request pool
> together, please put them into one helper(such as blk_mq_alloc_map_and_rqs)
> which can return the allocated tags and handle failure inline. Also we may
> convert current users into this helper.
>
>> }
Hi Ming,
Do you have a preference for the API:
int blk_mq_alloc_map_and_rqs(struct blk_mq_tag_set *set, struct
blk_mq_tags **tags, unsigned int hctx_idx, unsigned int depth);
void blk_mq_free_map_and_requests(struct blk_mq_tag_set *set,
struct blk_mq_tags **tags, unsigned int hctx_idx);
or
struct blk_mq_tags *blk_mq_alloc_map_and_rqs(struct blk_mq_tag_set *set,
unsigned int hctx_idx, unsigned int depth);
void blk_mq_free_map_and_requests(struct blk_mq_tag_set *set,
struct blk_mq_tags *tags, unsigned int hctx_idx);
The advantage of the first is that we don't need the pattern:
blk_mq_free_map_and_requests(tags)
tags = NULL;
But then passing struct blk_mq_tags ** is a bit overly complicated.
Thanks,
John
next prev parent reply other threads:[~2021-08-23 8:51 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-09 14:29 [PATCH v2 00/11] blk-mq: Reduce static requests memory footprint for shared sbitmap John Garry
2021-08-09 14:29 ` [PATCH v2 01/11] blk-mq: Change rqs check in blk_mq_free_rqs() John Garry
2021-08-09 14:29 ` [PATCH v2 02/11] block: Rename BLKDEV_MAX_RQ -> BLKDEV_DEFAULT_RQ John Garry
2021-08-09 14:29 ` [PATCH v2 03/11] blk-mq: Relocate shared sbitmap resize in blk_mq_update_nr_requests() John Garry
2021-08-18 3:49 ` Ming Lei
2021-08-09 14:29 ` [PATCH v2 04/11] blk-mq: Invert check " John Garry
2021-08-18 3:53 ` Ming Lei
2021-08-09 14:29 ` [PATCH v2 05/11] blk-mq-sched: Rename blk_mq_sched_alloc_{tags -> map_and_request}() John Garry
2021-08-18 3:55 ` Ming Lei
2021-08-09 14:29 ` [PATCH v2 06/11] blk-mq: Pass driver tags to blk_mq_clear_rq_mapping() John Garry
2021-08-09 17:00 ` kernel test robot
2021-08-09 17:10 ` John Garry
2021-08-09 19:55 ` kernel test robot
2021-08-18 4:02 ` Ming Lei
2021-08-18 12:00 ` John Garry
2021-08-19 0:39 ` Ming Lei
2021-08-19 7:32 ` John Garry
2021-08-23 2:59 ` Ming Lei
2021-08-09 14:29 ` [PATCH v2 07/11] blk-mq: Add blk_mq_tag_update_sched_shared_sbitmap() John Garry
2021-08-18 7:28 ` Ming Lei
2021-08-09 14:29 ` [PATCH v2 08/11] blk-mq: Add blk_mq_ops.init_request_no_hctx() John Garry
2021-08-18 7:38 ` Ming Lei
2021-08-18 8:46 ` John Garry
2021-08-09 14:29 ` [PATCH v2 09/11] scsi: Set blk_mq_ops.init_request_no_hctx John Garry
2021-08-09 14:29 ` [PATCH v2 10/11] blk-mq: Use shared tags for shared sbitmap support John Garry
2021-08-18 8:16 ` Ming Lei
2021-08-18 14:18 ` John Garry
2021-08-23 8:55 ` John Garry [this message]
2021-08-09 14:29 ` [PATCH v2 11/11] blk-mq: Stop using pointers for blk_mq_tags bitmap tags John Garry
2021-08-18 8:18 ` Ming Lei
2021-08-17 7:02 ` [PATCH v2 00/11] blk-mq: Reduce static requests memory footprint for shared sbitmap John Garry
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