io_uring: get rid of hashed provided buffer groups

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Use a plain array for any group ID that's less than 64, and punt
anything beyond that to an xarray. 64 fits in a page even for 4KB
page sizes and with the planned additions.

This makes the expected group usage faster by avoiding a hash and lookup
to find our list, and it uses less memory upfront by not allocating any
memory for provided buffers unless it's actually being used.

Suggested-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2022-05-01 10:52:44 -06:00

parent 4e90670252

commit 9cfc7e94e4

1 changed files with 58 additions and 39 deletions

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fs/io_uring.c

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