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
