io_uring: allow user configurable IO thread CPU affinity

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io-wq defaults to per-node masks for IO workers. This works fine by
default, but isn't particularly handy for workloads that prefer more
specific affinities, for either performance or isolation reasons.

This adds IORING_REGISTER_IOWQ_AFF that allows the user to pass in a CPU
mask that is then applied to IO thread workers, and an
IORING_UNREGISTER_IOWQ_AFF that simply resets the masks back to the
default of per-node.

Note that no care is given to existing IO threads, they will need to go
through a reschedule before the affinity is correct if they are already
running or sleeping.

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

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This commit is contained in:

Jens Axboe 2021-06-17 10:19:54 -06:00

parent 0e03496d19

commit fe76421d1d

4 changed files with 74 additions and 0 deletions

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17

fs/io-wq.c

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2

fs/io-wq.h

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51

fs/io_uring.c

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4

include/uapi/linux/io_uring.h

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