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* [PATCH v3 00/13] io_uring: buffer registration enhancements
@ 2020-12-18 18:07 Bijan Mottahedeh
  2020-12-18 18:07 ` [PATCH v3 01/13] io_uring: modularize io_sqe_buffer_register Bijan Mottahedeh
                   ` (13 more replies)
  0 siblings, 14 replies; 32+ messages in thread
From: Bijan Mottahedeh @ 2020-12-18 18:07 UTC (permalink / raw)
  To: axboe, asml.silence, io-uring

v3:

- batch file->rsrc renames into a signle patch when possible
- fix other review changes from v2
- fix checkpatch warnings

v2:

- drop readv/writev with fixed buffers patch
- handle ref_nodes both both files/buffers with a single ref_list
- make file/buffer handling more unified

This patchset implements a set of enhancements to buffer registration
consistent with existing file registration functionality:

- buffer registration updates		IORING_REGISTER_BUFFERS_UPDATE
					IORING_OP_BUFFERS_UPDATE

- buffer registration sharing		IORING_SETUP_SHARE_BUF
					IORING_SETUP_ATTACH_BUF

I have kept the original patchset unchanged for the most part to
facilitate reviewing and so this set adds a number of additional patches
mostly making file/buffer handling more unified.

Patch 1-2 modularize existing buffer registration code.

Patch 3-7 generalize fixed_file functionality to fixed_rsrc.

Patch 8 applies fixed_rsrc functionality for fixed buffers support.

Patch 9-10 generalize files_update functionality to rsrc_update.

Patch 11 implements buffer registration update, and introduces
IORING_REGISTER_BUFFERS_UPDATE and IORING_OP_BUFFERS_UPDATE, consistent
with file registration update.

Patch 12 generalizes fixed resource allocation 

Patch 13 implements buffer sharing among multiple rings; it works as follows:

- A new ring, A,  is setup. Since no buffers have been registered, the
  registered buffer state is an empty set, Z. That's different from the
  NULL state in current implementation.

- Ring B is setup, attaching to Ring A. It's also attaching to it's
  buffer registrations, now we have two references to the same empty
  set, Z.

- Ring A registers buffers into set Z, which is no longer empty.

- Ring B sees this immediately, since it's already sharing that set.

Testing

I have used liburing file-{register,update} tests as models for
buffer-{register,update,share}, tests and they run ok.

TBD

- I tried to use a single opcode for files/buffers but ran into an
issue since work_flags is different for files/buffers.  This should
be ok for the most part since req->work.flags is ultimately examined;
however, there are place where io_op_defs[opcode].work_flags is examined
directly, and I wasn't sure what would the best way to handle that.

- Need to still address Pavel's comments about deadlocks. I figure
to send out the set anyway since this is a last patch and may even be
handled separately.

Bijan Mottahedeh (13):
  io_uring: modularize io_sqe_buffer_register
  io_uring: modularize io_sqe_buffers_register
  io_uring: rename file related variables to rsrc
  io_uring: generalize io_queue_rsrc_removal
  io_uring: separate ref_list from fixed_rsrc_data
  io_uring: generalize fixed_file_ref_node functionality
  io_uring: add rsrc_ref locking routines
  io_uring: implement fixed buffers registration similar to fixed files
  io_uring: create common fixed_rsrc_ref_node handling routines
  io_uring: generalize files_update functionlity to rsrc_update
  io_uring: support buffer registration updates
  io_uring: create common fixed_rsrc_data allocation routines.
  io_uring: support buffer registration sharing

 fs/io_uring.c                 | 1004 +++++++++++++++++++++++++++++------------
 include/uapi/linux/io_uring.h |   12 +-
 2 files changed, 735 insertions(+), 281 deletions(-)

-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 32+ messages in thread

end of thread, other threads:[~2021-01-11  5:17 UTC | newest]

Thread overview: 32+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-12-18 18:07 [PATCH v3 00/13] io_uring: buffer registration enhancements Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 01/13] io_uring: modularize io_sqe_buffer_register Bijan Mottahedeh
2021-01-04 21:54   ` Pavel Begunkov
2021-01-06 19:46     ` Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 02/13] io_uring: modularize io_sqe_buffers_register Bijan Mottahedeh
2021-01-04 21:48   ` Pavel Begunkov
2020-12-18 18:07 ` [PATCH v3 03/13] io_uring: rename file related variables to rsrc Bijan Mottahedeh
2021-01-05  1:53   ` Pavel Begunkov
2021-01-06 19:46     ` Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 04/13] io_uring: generalize io_queue_rsrc_removal Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 05/13] io_uring: separate ref_list from fixed_rsrc_data Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 06/13] io_uring: generalize fixed_file_ref_node functionality Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 07/13] io_uring: add rsrc_ref locking routines Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 08/13] io_uring: implement fixed buffers registration similar to fixed files Bijan Mottahedeh
2021-01-05  2:43   ` Pavel Begunkov
2021-01-06 19:46     ` Bijan Mottahedeh
2021-01-06 22:22       ` Pavel Begunkov
2021-01-07  2:37       ` Pavel Begunkov
2021-01-07 21:21         ` Bijan Mottahedeh
2021-01-07 21:37           ` Pavel Begunkov
2021-01-07 22:14             ` Bijan Mottahedeh
2021-01-07 22:33               ` Pavel Begunkov
2021-01-07 23:10                 ` Pavel Begunkov
2021-01-08  1:53                   ` Bijan Mottahedeh
2021-01-11  5:12                     ` Pavel Begunkov
2021-01-08  0:17                 ` Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 09/13] io_uring: create common fixed_rsrc_ref_node handling routines Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 10/13] io_uring: generalize files_update functionlity to rsrc_update Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 11/13] io_uring: support buffer registration updates Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 12/13] io_uring: create common fixed_rsrc_data allocation routines Bijan Mottahedeh
2020-12-18 18:07 ` [PATCH v3 13/13] io_uring: support buffer registration sharing Bijan Mottahedeh
2021-01-04 17:09 ` [PATCH v3 00/13] io_uring: buffer registration enhancements Bijan Mottahedeh

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