From mboxrd@z Thu Jan 1 00:00:00 1970 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 CB9BAC3F6B0 for ; Mon, 15 Aug 2022 13:15:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242823AbiHONPZ (ORCPT ); Mon, 15 Aug 2022 09:15:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242825AbiHONPQ (ORCPT ); Mon, 15 Aug 2022 09:15:16 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 66C99AA for ; Mon, 15 Aug 2022 06:15:14 -0700 (PDT) Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27F9Oucg021310 for ; Mon, 15 Aug 2022 06:15:14 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=geNmTpnjsOWYMRBUJxVvCYS4XuDc2QzfNx/AmkFBHp8=; b=N5TpzS3jfUEEcj/LoviAbBCzxTK1Nu6/rBD2He2rBg2C8S1HvfzDecfk1ufbZT+w/+e8 GtLJTDgUFB2sw8Fzgo3XYCYHDqf4VjpnaCqqN8VI5VymQ1KNwHSFlQ8b1pQ/uE0Z/fVN FQfGOiCD1gNNjbvgby2HHWzmA4iGezXMKNk= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3hykfy0x67-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Mon, 15 Aug 2022 06:15:14 -0700 Received: from twshared6324.05.ash7.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:11d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 15 Aug 2022 06:15:13 -0700 Received: by devbig038.lla2.facebook.com (Postfix, from userid 572232) id 4C0CA49B7303; Mon, 15 Aug 2022 06:09:55 -0700 (PDT) From: Dylan Yudaken To: Jens Axboe , Pavel Begunkov , CC: , Dylan Yudaken Subject: [PATCH liburing 07/11] update io_uring_enter.2 docs for IORING_FEAT_NODROP Date: Mon, 15 Aug 2022 06:09:43 -0700 Message-ID: <20220815130947.1002152-8-dylany@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220815130947.1002152-1-dylany@fb.com> References: <20220815130947.1002152-1-dylany@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-FB-Internal: Safe Content-Type: text/plain X-Proofpoint-GUID: omJB7LsFtjthKxVPmtNfBdsBtDoMS6XX X-Proofpoint-ORIG-GUID: omJB7LsFtjthKxVPmtNfBdsBtDoMS6XX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-15_08,2022-08-15_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org The EBUSY docs are out of date, so update them for the IORING_FEAT_NODROP feature flag Signed-off-by: Dylan Yudaken --- man/io_uring_enter.2 | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/man/io_uring_enter.2 b/man/io_uring_enter.2 index 6e3ffa0f5ba8..9ad6349b2c4a 100644 --- a/man/io_uring_enter.2 +++ b/man/io_uring_enter.2 @@ -1327,7 +1327,18 @@ is a valid file descriptor, but the io_uring ring = is not in the right state for details on how to enable the ring. .TP .B EBUSY -The application is attempting to overcommit the number of requests it ca= n have +If the +.B IORING_FEAT_NODROP +feature flag is set, then +.B EBUSY +will be returned if there were overflow entries, +.B IORING_ENTER_GETEVENTS +flag is set and not all of the overflow entries were able to be flushed = to +the CQ ring. + +Without +.B IORING_FEAT_NODROP +the application is attempting to overcommit the number of requests it ca= n have pending. The application should wait for some completions and try again.= May occur if the application tries to queue more requests than we have room = for in the CQ ring, or if the application attempts to wait for more events with= out --=20 2.30.2