From: Hao Xu Date: Tue, 6 Apr 2021 03:08:45 +0000 (+0800) Subject: io-wq: simplify code in __io_worker_busy() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=417b5052be9ec892d06a45dbecf6d3f6ae211ae3;p=linux.git io-wq: simplify code in __io_worker_busy() Leverage XOR to simplify the code in __io_worker_busy. Signed-off-by: Hao Xu Link: https://lore.kernel.org/r/1617678525-3129-1-git-send-email-haoxu@linux.alibaba.com Signed-off-by: Jens Axboe --- diff --git a/fs/io-wq.c b/fs/io-wq.c index 5551272cf5534..b1c093de9723d 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -329,6 +329,8 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, { bool worker_bound, work_bound; + BUILD_BUG_ON((IO_WQ_ACCT_UNBOUND ^ IO_WQ_ACCT_BOUND) != 1); + if (worker->flags & IO_WORKER_F_FREE) { worker->flags &= ~IO_WORKER_F_FREE; hlist_nulls_del_init_rcu(&worker->nulls_node); @@ -341,16 +343,11 @@ static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker, worker_bound = (worker->flags & IO_WORKER_F_BOUND) != 0; work_bound = (work->flags & IO_WQ_WORK_UNBOUND) == 0; if (worker_bound != work_bound) { + int index = work_bound ? IO_WQ_ACCT_UNBOUND : IO_WQ_ACCT_BOUND; io_wqe_dec_running(worker); - if (work_bound) { - worker->flags |= IO_WORKER_F_BOUND; - wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers--; - wqe->acct[IO_WQ_ACCT_BOUND].nr_workers++; - } else { - worker->flags &= ~IO_WORKER_F_BOUND; - wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers++; - wqe->acct[IO_WQ_ACCT_BOUND].nr_workers--; - } + worker->flags ^= IO_WORKER_F_BOUND; + wqe->acct[index].nr_workers--; + wqe->acct[index ^ 1].nr_workers++; io_wqe_inc_running(worker); } }