io_uring: split overflow state into SQ and CQ side

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We currently check ->cq_overflow_list from both SQ and CQ context, which
causes some bouncing of that cache line. Add separate bits of state for
this instead, so that the SQ side can check using its own state, and
likewise for the CQ side.

This adds ->sq_check_overflow with the SQ state, and ->cq_check_overflow
with the CQ state. If we hit an overflow condition, both of these bits
are set. Likewise for overflow flush clear, we clear both bits. For the
fast path of just checking if there's an overflow condition on either
the SQ or CQ side, we can use our own private bit for this.

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

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Jens Axboe 2019-12-18 17:12:20 -07:00

parent d3656344fe

commit ad3eb2c89f

1 changed files with 27 additions and 13 deletions

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fs/io_uring.c

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