diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 55101013f3ee84a3fd9ac8e0858e6a050f34ca79..9c92ca081c115d1de631a4e81906c8c611cfd1c6 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1238,6 +1238,15 @@ void tctx_task_work(struct callback_head *cb) loops++; node = io_llist_xchg(&tctx->task_list, &fake); count += handle_tw_list(node, &ctx, &uring_locked, &fake); + + /* skip expensive cmpxchg if there are items in the list */ + if (READ_ONCE(tctx->task_list.first) != &fake) + continue; + if (uring_locked && !wq_list_empty(&ctx->submit_state.compl_reqs)) { + io_submit_flush_completions(ctx); + if (READ_ONCE(tctx->task_list.first) != &fake) + continue; + } node = io_llist_cmpxchg(&tctx->task_list, &fake, NULL); } while (node != &fake);