io_uring: cache task struct refs
tctx in submission part is always synchronised because is executed from the task's context, so we can batch allocate tctx/task references and store them across syscall boundaries. It avoids enough of operations, including an atomic for getting task ref and a percpu_counter_add() function call, which still fallback to spinlock for large batching cases (around >=32). Should be good for SQPOLL submitting in small portions and coming at some moment bpf submissions. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/14b327b973410a3eec1f702ecf650e100513aca9.1623634181.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>
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