From 7cdaf587de7c6f494b8433fded19f7728e70e1ef Mon Sep 17 00:00:00 2001 From: Xiaoguang Wang Date: Wed, 10 Jun 2020 19:41:19 +0800 Subject: io_uring: avoid whole io_wq_work copy for requests completed inline If requests can be submitted and completed inline, we don't need to initialize whole io_wq_work in io_init_req(), which is an expensive operation, add a new 'REQ_F_WORK_INITIALIZED' to determine whether io_wq_work is initialized and add a helper io_req_init_async(), users must call io_req_init_async() for the first time touching any members of io_wq_work. I use /dev/nullb0 to evaluate performance improvement in my physical machine: modprobe null_blk nr_devices=1 completion_nsec=0 sudo taskset -c 60 fio -name=fiotest -filename=/dev/nullb0 -iodepth=128 -thread -rw=read -ioengine=io_uring -direct=1 -bs=4k -size=100G -numjobs=1 -time_based -runtime=120 before this patch: Run status group 0 (all jobs): READ: bw=724MiB/s (759MB/s), 724MiB/s-724MiB/s (759MB/s-759MB/s), io=84.8GiB (91.1GB), run=120001-120001msec With this patch: Run status group 0 (all jobs): READ: bw=761MiB/s (798MB/s), 761MiB/s-761MiB/s (798MB/s-798MB/s), io=89.2GiB (95.8GB), run=120001-120001msec About 5% improvement. Signed-off-by: Xiaoguang Wang Signed-off-by: Jens Axboe --- fs/io-wq.h | 5 ----- 1 file changed, 5 deletions(-) (limited to 'fs/io-wq.h') diff --git a/fs/io-wq.h b/fs/io-wq.h index 2db24d31fbc5..8e138fa88b9f 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -93,11 +93,6 @@ struct io_wq_work { pid_t task_pid; }; -#define INIT_IO_WORK(work) \ - do { \ - *(work) = (struct io_wq_work){}; \ - } while (0) \ - static inline struct io_wq_work *wq_next_work(struct io_wq_work *work) { if (!work->list.next) -- cgit v1.2.3