diff options
| author | Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> | 2020-06-10 19:41:20 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-06-10 17:58:46 -0600 |
| commit | 405a5d2b2762f2a9813efdee93274d4e7bf607a1 (patch) | |
| tree | 498a25887da9a912ce5f70af31804a12ef207e4e /fs/io_uring.c | |
| parent | 7cdaf587de7c6f494b8433fded19f7728e70e1ef (diff) | |
| download | lwn-405a5d2b2762f2a9813efdee93274d4e7bf607a1.tar.gz lwn-405a5d2b2762f2a9813efdee93274d4e7bf607a1.zip | |
io_uring: avoid unnecessary io_wq_work copy for fast poll feature
Basically IORING_OP_POLL_ADD command and async armed poll handlers
for regular commands don't touch io_wq_work, so only REQ_F_WORK_INITIALIZED
is set, can we do io_wq_work copy and restore.
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 5a2c004439f0..d72b2a9463ca 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -4262,7 +4262,8 @@ static void io_async_task_func(struct callback_head *cb) spin_unlock_irq(&ctx->completion_lock); /* restore ->work in case we need to retry again */ - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, sizeof(req->work)); kfree(apoll); if (!canceled) { @@ -4359,7 +4360,8 @@ static bool io_arm_poll_handler(struct io_kiocb *req) return false; req->flags |= REQ_F_POLLED; - memcpy(&apoll->work, &req->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&apoll->work, &req->work, sizeof(req->work)); had_io = req->io != NULL; get_task_struct(current); @@ -4384,7 +4386,8 @@ static bool io_arm_poll_handler(struct io_kiocb *req) if (!had_io) io_poll_remove_double(req); spin_unlock_irq(&ctx->completion_lock); - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, sizeof(req->work)); kfree(apoll); return false; } @@ -4429,7 +4432,9 @@ static bool io_poll_remove_one(struct io_kiocb *req) * io_req_work_drop_env below when dropping the * final reference. */ - memcpy(&req->work, &apoll->work, sizeof(req->work)); + if (req->flags & REQ_F_WORK_INITIALIZED) + memcpy(&req->work, &apoll->work, + sizeof(req->work)); kfree(apoll); } } |