From: Hannes Reinecke <hare@suse.de>
To: Ilya Dryomov <idryomov@gmail.com>
Cc: Sage Weil <sage@redhat.com>, Daniel Disseldorp <ddiss@suse.com>,
Jens Axboe <axboe@kernel.dk>,
ceph-devel@vger.kernel.org, linux-block@vger.kernel.org,
Hannes Reinecke <hare@suse.de>
Subject: [PATCH 00/15] rbd: switch to blk-mq
Date: Fri, 31 Jan 2020 11:37:24 +0100 [thread overview]
Message-ID: <20200131103739.136098-1-hare@suse.de> (raw)
Hi all,
this patchset implements multiqueue support for rbd, which gives
a nice performance benefit (I measured up to 25% on my grid).
To achieve this several steps are required:
1) drop the 'state_mutex' in rbd_img_advance.
To do so the state machines had to be reordered so ensure
no race windows are left when invoking asynchronous methods.
2) Embed image request into the block request to save a memory
allocation in the hot path
3) Enable one queue per CPU to enhance parallelism.
I also took the opportunity to clean up the state machines, by
adding a 'done' step and ensuring that the step is always set
correctly upon exit. This allows for better debugging as now
the final states must always be set when destroying an object.
As usual, comments and reviews are welcome.
Hannes Reinecke (15):
rbd: lock object request list
rbd: use READ_ONCE() when checking the mapping size
rbd: reorder rbd_img_advance()
rbd: reorder switch statement in rbd_advance_read()
rbd: reorder switch statement in rbd_advance_write()
rbd: add 'done' state for rbd_obj_advance_copyup()
rbd: use callback for image request completion
rbd: add debugging statements for the state machine
rbd: count pending object requests in-line
rbd: kill 'work_result'
rbd: drop state_mutex in __rbd_img_handle_request()
rbd: kill img_request kref
rbd: schedule image_request after preparation
rbd: embed image request as blk_mq request payload
rbd: switch to blk-mq
drivers/block/rbd.c | 418 ++++++++++++++++++++++++++++++----------------------
1 file changed, 240 insertions(+), 178 deletions(-)
--
2.16.4
next reply other threads:[~2020-01-31 10:38 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 10:37 Hannes Reinecke [this message]
2020-01-31 10:37 ` [PATCH 01/15] rbd: lock object request list Hannes Reinecke
2020-02-03 16:38 ` Ilya Dryomov
2020-01-31 10:37 ` [PATCH 02/15] rbd: use READ_ONCE() when checking the mapping size Hannes Reinecke
2020-02-03 16:50 ` Ilya Dryomov
2020-02-04 7:05 ` Hannes Reinecke
2020-01-31 10:37 ` [PATCH 03/15] rbd: reorder rbd_img_advance() Hannes Reinecke
2020-01-31 10:37 ` [PATCH 04/15] rbd: reorder switch statement in rbd_advance_read() Hannes Reinecke
2020-01-31 10:37 ` [PATCH 05/15] rbd: reorder switch statement in rbd_advance_write() Hannes Reinecke
2020-01-31 10:37 ` [PATCH 06/15] rbd: add 'done' state for rbd_obj_advance_copyup() Hannes Reinecke
2020-01-31 10:37 ` [PATCH 07/15] rbd: use callback for image request completion Hannes Reinecke
2020-02-03 17:13 ` Ilya Dryomov
2020-01-31 10:37 ` [PATCH 08/15] rbd: add debugging statements for the state machine Hannes Reinecke
2020-01-31 10:37 ` [PATCH 09/15] rbd: count pending object requests in-line Hannes Reinecke
2020-02-03 17:47 ` Ilya Dryomov
2020-02-04 6:59 ` Hannes Reinecke
2020-01-31 10:37 ` [PATCH 10/15] rbd: kill 'work_result' Hannes Reinecke
2020-01-31 10:37 ` [PATCH 11/15] rbd: drop state_mutex in __rbd_img_handle_request() Hannes Reinecke
2020-02-03 18:01 ` Ilya Dryomov
2020-01-31 10:37 ` [PATCH 12/15] rbd: kill img_request kref Hannes Reinecke
2020-01-31 10:37 ` [PATCH 13/15] rbd: schedule image_request after preparation Hannes Reinecke
2020-02-03 18:40 ` Ilya Dryomov
2020-01-31 10:37 ` [PATCH 14/15] rbd: embed image request as blk_mq request payload Hannes Reinecke
2020-01-31 10:37 ` [PATCH 15/15] rbd: switch to blk-mq Hannes Reinecke
2020-02-03 8:36 ` Christoph Hellwig
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