io_uring: batch getting pcpu references

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percpu_ref_tryget() has its own overhead. Instead getting a reference
for each request, grab a bunch once per io_submit_sqes().

~5% throughput boost for a "submit and wait 128 nops" benchmark.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>

__io_req_free_empty() -> __io_req_do_free()

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

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Pavel Begunkov 2019-12-28 14:13:03 +03:00 • committed by Jens Axboe

parent 4e5ef02317

commit 2b85edfc0c

1 changed files with 17 additions and 9 deletions

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fs/io_uring.c

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