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| author | Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> | 2020-06-10 14:41:19 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-11 02:58:46 +0300 |
| commit | 7cdaf587de7c6f494b8433fded19f7728e70e1ef (patch) | |
| tree | 14b4686517cdc4f0a7fa4ef2faf6b4658b198572 /fs/io-wq.h | |
| parent | c5b856255cbc3b664d686a83fa9397a835e063de (diff) | |
| download | linux-7cdaf587de7c6f494b8433fded19f7728e70e1ef.tar.xz | |
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 <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.h')
| -rw-r--r-- | fs/io-wq.h | 5 |
1 files changed, 0 insertions, 5 deletions
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) |