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io_uring: move 'poll_multi_queue' bool in io_ring_ctx
The cacheline section holding this variable has two gaps, where one is caused by this bool not packing well with structs. This causes it to blow into the next cacheline. Move the variable, shrinking io_ring_ctx by a full cacheline in size. Signed-off-by: Jens Axboe <axboe@kernel.dk>
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