From: John Garry <john.garry@huawei.com>
To: <axboe@kernel.dk>, <jejb@linux.ibm.com>, <martin.petersen@oracle.com>
Cc: <linux-block@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-scsi@vger.kernel.org>, <kashyap.desai@broadcom.com>,
<hare@suse.de>, <ming.lei@redhat.com>,
John Garry <john.garry@huawei.com>
Subject: [PATCH v2 00/11] blk-mq: Reduce static requests memory footprint for shared sbitmap
Date: Mon, 9 Aug 2021 22:29:27 +0800 [thread overview]
Message-ID: <1628519378-211232-1-git-send-email-john.garry@huawei.com> (raw)
Currently a full set of static requests are allocated per hw queue per
tagset when shared sbitmap is used.
However, only tagset->queue_depth number of requests may be active at
any given time. As such, only tagset->queue_depth number of static
requests are required.
The same goes for using an IO scheduler, which allocates a full set of
static requests per hw queue per request queue.
This series changes shared sbitmap support by using a shared tags per
tagset and request queue. Ming suggested something along those lines in
v1. But we'll keep name "shared sbitmap" name as it is fimilar. In using
a shared tags, the static rqs also become shared, reducing the number of
sets of static rqs, reducing memory usage.
Patch "blk-mq: Use shared tags for shared sbitmap support" is a bit big,
and could be broken down. But then maintaining ability to bisect
becomes harder and each sub-patch would get more convoluted.
For megaraid sas driver on my 128-CPU arm64 system with 1x SATA disk, we
save approx. 300MB(!) [370MB -> 60MB]
Baseline is 2112f5c1330a (for-5.15/block) loop: Select I/O scheduler ...
Changes since v1:
- Switch to use blk_mq_tags for shared sbitmap
- Add new blk_mq_ops init request callback
- Add some RB tags (thanks!)
John Garry (11):
blk-mq: Change rqs check in blk_mq_free_rqs()
block: Rename BLKDEV_MAX_RQ -> BLKDEV_DEFAULT_RQ
blk-mq: Relocate shared sbitmap resize in blk_mq_update_nr_requests()
blk-mq: Invert check in blk_mq_update_nr_requests()
blk-mq-sched: Rename blk_mq_sched_alloc_{tags -> map_and_request}()
blk-mq: Pass driver tags to blk_mq_clear_rq_mapping()
blk-mq: Add blk_mq_tag_update_sched_shared_sbitmap()
blk-mq: Add blk_mq_ops.init_request_no_hctx()
scsi: Set blk_mq_ops.init_request_no_hctx
blk-mq: Use shared tags for shared sbitmap support
blk-mq: Stop using pointers for blk_mq_tags bitmap tags
block/bfq-iosched.c | 4 +-
block/blk-core.c | 2 +-
block/blk-mq-debugfs.c | 8 +--
block/blk-mq-sched.c | 92 +++++++++++++------------
block/blk-mq-sched.h | 2 +-
block/blk-mq-tag.c | 111 +++++++++++++-----------------
block/blk-mq-tag.h | 12 ++--
block/blk-mq.c | 144 +++++++++++++++++++++++----------------
block/blk-mq.h | 8 +--
block/kyber-iosched.c | 4 +-
block/mq-deadline-main.c | 2 +-
drivers/block/rbd.c | 2 +-
drivers/scsi/scsi_lib.c | 6 +-
include/linux/blk-mq.h | 20 +++---
include/linux/blkdev.h | 5 +-
15 files changed, 218 insertions(+), 204 deletions(-)
--
2.26.2
next reply other threads:[~2021-08-09 14:38 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-09 14:29 John Garry [this message]
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
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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