From patchwork Tue May 2 16:53:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 13229186 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE670C7EE25 for ; Tue, 2 May 2023 16:54:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234388AbjEBQyR (ORCPT ); Tue, 2 May 2023 12:54:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40386 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234389AbjEBQyM (ORCPT ); Tue, 2 May 2023 12:54:12 -0400 Received: from 66-220-144-178.mail-mxout.facebook.com (66-220-144-178.mail-mxout.facebook.com [66.220.144.178]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9B413A86 for ; Tue, 2 May 2023 09:54:03 -0700 (PDT) Received: by devbig1114.prn1.facebook.com (Postfix, from userid 425415) id 2703E4CF6CC3; Tue, 2 May 2023 09:53:47 -0700 (PDT) From: Stefan Roesch To: io-uring@vger.kernel.org, kernel-team@fb.com Cc: shr@devkernel.io, axboe@kernel.dk, ammarfaizi2@gnuweeb.org, Olivier Langlois Subject: [PATCH v12 3/5] io-uring: add sqpoll support for napi busy poll Date: Tue, 2 May 2023 09:53:30 -0700 Message-Id: <20230502165332.2075091-4-shr@devkernel.io> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230502165332.2075091-1-shr@devkernel.io> References: <20230502165332.2075091-1-shr@devkernel.io> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org This adds the sqpoll support to the io-uring napi. Signed-off-by: Stefan Roesch Suggested-by: Olivier Langlois --- io_uring/napi.c | 24 ++++++++++++++++++++++++ io_uring/napi.h | 2 ++ io_uring/sqpoll.c | 4 ++++ 3 files changed, 30 insertions(+) diff --git a/io_uring/napi.c b/io_uring/napi.c index 76bcabeb7ef0..491d028e8146 100644 --- a/io_uring/napi.c +++ b/io_uring/napi.c @@ -257,4 +257,28 @@ void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq) io_napi_blocking_busy_loop(ctx, iowq); } +/* + * io_napi_sqpoll_busy_poll() - busy poll loop for sqpoll + * @ctx: pointer to io-uring context structure + * + * Splice of the napi list and execute the napi busy poll loop. + */ +int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx) +{ + LIST_HEAD(napi_list); + bool is_stale = false; + + if (!READ_ONCE(ctx->napi_busy_poll_to)) + return 0; + if (list_empty_careful(&ctx->napi_list)) + return 0; + + rcu_read_lock(); + is_stale = __io_napi_do_busy_loop(ctx, NULL); + rcu_read_unlock(); + + io_napi_remove_stale(ctx, is_stale); + return 1; +} + #endif diff --git a/io_uring/napi.h b/io_uring/napi.h index 1bdf8442081f..0484dfd9a396 100644 --- a/io_uring/napi.h +++ b/io_uring/napi.h @@ -17,6 +17,7 @@ void __io_napi_add(struct io_ring_ctx *ctx, struct file *file); void __io_napi_adjust_timeout(struct io_ring_ctx *ctx, struct io_wait_queue *iowq, struct timespec64 *ts); void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq); +int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx); static inline bool io_napi(struct io_ring_ctx *ctx) { @@ -77,6 +78,7 @@ static inline void io_napi_add(struct io_kiocb *req) #define io_napi_adjust_timeout(ctx, iowq, ts) do {} while (0) #define io_napi_busy_loop(ctx, iowq) do {} while (0) +#define io_napi_sqpoll_busy_poll(ctx) (0) #endif diff --git a/io_uring/sqpoll.c b/io_uring/sqpoll.c index 9db4bc1f521a..0c8d53ef134a 100644 --- a/io_uring/sqpoll.c +++ b/io_uring/sqpoll.c @@ -15,6 +15,7 @@ #include #include "io_uring.h" +#include "napi.h" #include "sqpoll.h" #define IORING_SQPOLL_CAP_ENTRIES_VALUE 8 @@ -193,6 +194,9 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries) ret = io_submit_sqes(ctx, to_submit); mutex_unlock(&ctx->uring_lock); + if (io_napi(ctx)) + ret += io_napi_sqpoll_busy_poll(ctx); + if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait)) wake_up(&ctx->sqo_sq_wait); if (creds)