io_uring changes for 5.12-rc

Hi Linus,

Highlights from this cycles are things like request recycling and task_work optimizations, which net us anywhere from 10-20% of speedups on workloads that mostly are inline. This work was originall done to put io_uring under memcg, which adds considerable overhead. But it's a really nice win as well. Also worth highlighting is the LOOKUP_CACHED work in the VFS, and using it in io_uring. Greatly speeds up the fast path for file opens.

Note that this branch depends on Al's work.namei pull request that he sent in earlier.

- Put io_uring under memcg protection. We accounted just the rings themselves under rlimit memlock before, now we account everything.

- Request cache recycling, persistent across invocations (Pavel, me)

- First part of a cleanup/improvement to buffer registration (Bijan)

- SQPOLL fixes (Hao)

- File registration NULL pointer fixup (Dan)

- LOOKUP_CACHED support for io_uring

- Disable /proc/thread-self/ for io_uring, like we do for /proc/self

- Add Pavel to the io_uring MAINTAINERS entry

- Tons of code cleanups and optimizations (Pavel)

- Support for skip entries in file registration (Noah)

Please pull!

The following changes since commit 1048ba83fb1c00cd24172e23e8263972f6b5d9ac:

Linux 5.11-rc6 (2021-01-31 13:50:09 -0800)

are available in the Git repository at:

git://git.kernel.dk/linux-block.git tags/for-5.12/io_uring-2021-02-17

for you to fetch changes up to 0b81e80c813f92520667c872d499a2dba8377be6:

io_uring: tctx->task_lock should be IRQ safe (2021-02-16 11:11:20 -0700)

----------------------------------------------------------------
for-5.12/io_uring-2021-02-17

----------------------------------------------------------------
Bijan Mottahedeh (10):
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: add rsrc_ref locking routines
io_uring: split alloc_fixed_file_ref_node
io_uring: create common fixed_rsrc_ref_node handling routines
io_uring: create common fixed_rsrc_data allocation routines
io_uring: make percpu_ref_release names consistent

Colin Ian King (1):
io_uring: remove redundant initialization of variable ret

Dan Carpenter (1):
io_uring: Fix NULL dereference in error in io_sqe_files_register()

Hao Xu (2):
io_uring: check kthread parked flag before sqthread goes to sleep
io_uring: fix possible deadlock in io_uring_poll

Jens Axboe (19):
Merge branch 'work.namei' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs into for-5.12/io_uring
io_uring: enable LOOKUP_CACHED path resolution for filename lookups
fs: provide locked helper variant of close_fd_get_file()
io_uring: get rid of intermediate IORING_OP_CLOSE stage
io_uring/io-wq: kill off now unused IO_WQ_WORK_NO_CANCEL
io_uring: use persistent request cache
io_uring: provide FIFO ordering for task_work
io_uring: enable req cache for task_work items
io_uring: enable req cache for IRQ driven IO
io_uring: enable kmemcg account for io_uring requests
io_uring: place ring SQ/CQ arrays under memcg memory limits
io_uring: assign file_slot prior to calling io_sqe_file_register()
io_uring: move submit side state closer in the ring
io-wq: clear out worker ->fs and ->files
io_uring: allow task match to be passed to io_req_cache_free()
io_uring: add helper to free all request caches
io_uring: kill cached requests from exiting task closing the ring
proc: don't allow async path resolution of /proc/thread-self components
io_uring: tctx->task_lock should be IRQ safe

Pavel Begunkov (69):
io_uring: split ref_node alloc and init
io_uring: optimise io_rw_reissue()
io_uring: refactor io_resubmit_prep()
io_uring: cleanup personalities under uring_lock
io_uring: inline io_async_submit()
io_uring: inline __io_commit_cqring()
io_uring: further deduplicate #CQ events calc
io_uring: simplify io_alloc_req()
io_uring: remove __io_state_file_put
io_uring: deduplicate failing task_work_add
io_uring: add a helper timeout mode calculation
io_uring: help inlining of io_req_complete()
io_uring: don't flush CQEs deep down the stack
io_uring: save atomic dec for inline executed reqs
io_uring: ensure only sqo_task has file notes
io_uring: consolidate putting reqs task
io_uring: cleanup files_update looping
MAINTAINERS: update io_uring section
io_uring: fix inconsistent lock state
io_uring: kill not used needs_file_no_error
io_uring: inline io_req_drop_files()
io_uring: remove work flags after cleanup
io_uring: deduplicate adding to REQ_F_INFLIGHT
io_uring: simplify do_read return parsing
io_uring: deduplicate core cancellations sequence
io_uring: refactor scheduling in io_cqring_wait
io_uring: refactor io_cqring_wait
io_uring: refactor io_read for unsupported nowait
io_uring: further simplify do_read error parsing
io_uring: let io_setup_async_rw take care of iovec
io_uring: don't forget to adjust io_size
io_uring: inline io_read()'s iovec freeing
io_uring: highlight read-retry loop
io_uring: treat NONBLOCK and RWF_NOWAIT similarly
io_uring: io_import_iovec return type cleanup
io_uring: deduplicate file table slot calculation io_uring/io-wq: return 2-step work swap scheme
io_uring: set msg_name on msg fixup
io_uring: clean iov usage for recvmsg buf select
io_uring: refactor sendmsg/recvmsg iov managing
io_uring: cleanup up cancel SQPOLL reqs across exec
io_uring: replace force_nonblock with flags
io_uring: make op handlers always take issue flags
io_uring: don't propagate io_comp_state
io_uring: don't keep submit_state on stack
io_uring: remove ctx from comp_state
io_uring: don't reinit submit state every time
io_uring: replace list with array for compl batch
io_uring: submit-completion free batching
io_uring: remove fallback_req
io_uring: count ctx refs separately from reqs
io_uring: persistent req cache
io_uring: feed reqs back into alloc cache
io_uring: take comp_state from ctx
io_uring: defer flushing cached reqs
io_uring: unpark SQPOLL thread for cancelation
io_uring: clean up io_req_free_batch_finish()
io_uring: simplify iopoll reissuing
io_uring: move res check out of io_rw_reissue()
io_uring: inline io_complete_rw_common()
io_uring: take compl state from submit state
io_uring: optimise out unlikely link queue
io_uring: optimise SQPOLL mm/files grabbing
io_uring: don't duplicate io_req_task_queue()
io_uring: save ctx put/get for task_work submit
io_uring: don't split out consume out of SQE get
io_uring: don't check PF_EXITING from syscall
io_uring: clean io_req_find_next() fast check
io_uring: optimise io_init_req() flags setting

Yejune Deng (1):
io_uring: simplify io_remove_personalities()

noah (1):
io_uring: Add skip option for __io_sqe_files_update

 MAINTAINERS                   |    5 +
 fs/file.c                     |   36 +-
 fs/internal.h                 |    1 +
 fs/io-wq.c                    |   31 +-
 fs/io-wq.h                    |   14 +-
 fs/io_uring.c                 | 2658 +++++++++++++++++----------------
 fs/namei.c                    |    8 +-
 fs/proc/self.c                |    2 +-
 fs/proc/thread_self.c         |    7 +
 include/linux/io_uring.h      |   14 +
 include/uapi/linux/io_uring.h |   10 +
 11 files changed, 1435 insertions(+), 1351 deletions(-)

Jens Axboe

(Adding io-uring list, made a mistake in the first one and only added linux-block)

Jens Axboe