io_uring: improve poll completion performance

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For busy IORING_OP_POLL_ADD workloads, we can have enough contention
on the completion lock that we fail the inline completion path quite
often as we fail the trylock on that lock. Add a list for deferred
completions that we can use in that case. This helps reduce the number
of async offloads we have to do, as if we get multiple completions in
a row, we'll piggy back on to the poll_llist instead of having to queue
our own offload.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2019-12-19 12:06:02 -07:00

parent ad3eb2c89f

commit e94f141bd2

1 changed files with 88 additions and 20 deletions

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fs/io_uring.c

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