[PATCH 0/8] second part of 5.12 patches

Pavel Begunkov
2021-01-25T12:12:39Z

1,2 are simple, can be considered separately

3-8 are inline completion optimisations, should affect buffered rw,
recv/send and others that can complete inline.

fio/t/io_uring do_nop=1 benchmark (batch=32) in KIOPS:
baseline (1-5 applied): qd32: 8001, qd1: 2015
arrays (+6/8): qd32: 8128, qd1: 2028
batching (+7/8): qd32: 10300, qd1: 1946

The downside is worse qd1 with batching, don't think we should care much
because most of the time is syscalling, and I can easily get ~15-30% and
5-10% for qd32 and qd1 respectively by making ring's allocation cache
persistent and feeding memory of inline executed requests back into it.
Note: this should not affect async executed requests, e.g. block rw,
because they never hit this path.

Pavel Begunkov (8):
io_uring: ensure only sqo_task has file notes
io_uring: consolidate putting reqs task
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: keep interrupts on on submit completion

fs/io_uring.c | 221 +++++++++++++++++++++++++-------------------------
1 file changed, 110 insertions(+), 111 deletions(-)

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2.24.0