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[209.132.180.67]) by mx.google.com with ESMTP id b10si3559024oic.153.2020.01.27.08.33.48; Mon, 27 Jan 2020 08:34:00 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel-dk.20150623.gappssmtp.com header.s=20150623 header.b=DDTA9J1C; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726083AbgA0Qcq (ORCPT + 99 others); Mon, 27 Jan 2020 11:32:46 -0500 Received: from mail-io1-f67.google.com ([209.85.166.67]:39689 "EHLO mail-io1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725897AbgA0Qcp (ORCPT ); Mon, 27 Jan 2020 11:32:45 -0500 Received: by mail-io1-f67.google.com with SMTP id c16so10686067ioh.6 for ; Mon, 27 Jan 2020 08:32:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=Yov7ap4biFBzdzvuUJNulONNcHIgznC4VCf+Gem9vsM=; b=DDTA9J1CCeDgzLa078hSsNZrE5s+EWQhKdJ2pqw/kyeJPhUdV2fImtaKqWoH0yU2qT u+V3r4O9ouTvDVKCkNBs6KL1ZhLd+TSZ2YoubgVTvhqVadU0FvkTkbibF+iXAGhzk+b4 Gvje+NpQRSk2WLu1xUSn11H2Brc+4tKnly6s7uluSICp9V5HKUQWB+sBmQbvgJbH6yye i8bWFFK1bCwjh7UHjnSzHZ0rJ+dA0gF44r+dAL1oF70gJnEw4U4ctfwJTS9ZZC+7thVd uFbYCeaccmaIiop1Hmg3wYzQ6J4qgfZwYOL4lcOOPD2ioNKD6JHg+Owwk48k3DS2zfPl vCnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Yov7ap4biFBzdzvuUJNulONNcHIgznC4VCf+Gem9vsM=; b=EHTIY43/LPWMHNSyn+7QVCWI4YncdReFOayApswiFb25+6iLmoShdHaoaMM5g+pE4J Ym8RcGDPsePIbkMzxyM9Yfi1QHdU9ckO6C0Bh4pCceK8siUhMRbI+Zq1YK9kOcGgRVRc +zzEAloBmjb6uqg0Ow/iq5Wn4/1ymJBNxHPi2JwNcBs+rsVnq8AweJfvpi0xDllsUh8J OWS7wzQmW7mmfFvIxlzjkzJOviD0Xfbaa/bQ2kLuZOPCG5X+2tXpAbDyK12R2HV1DyUF f35QoLOwr1SpQHwlQPeY2zm6ib/F/l1Sw6vHAmoLk4H8OeDCLHN98zw3jTF5FV2XvSop R8oA== X-Gm-Message-State: APjAAAUwb6bCPvbsMwZfLm1H31lun3eB/BsUMViM67RgxrVrFMkxP8Bm w0l3LjV0P59B/TmT9/F2q70eHjMic9o= X-Received: by 2002:a02:c942:: with SMTP id u2mr14262871jao.49.1580142764895; Mon, 27 Jan 2020 08:32:44 -0800 (PST) Received: from [192.168.1.159] ([65.144.74.34]) by smtp.gmail.com with ESMTPSA id n207sm2720985iod.55.2020.01.27.08.32.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Jan 2020 08:32:44 -0800 (PST) Subject: Re: [PATCH liburing 1/1] test: add epoll test case To: Stefano Garzarella Cc: io-uring@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200127161701.153625-1-sgarzare@redhat.com> <20200127161701.153625-2-sgarzare@redhat.com> From: Jens Axboe Message-ID: Date: Mon, 27 Jan 2020 09:32:43 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200127161701.153625-2-sgarzare@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 1/27/20 9:17 AM, Stefano Garzarella wrote: > Signed-off-by: Stefano Garzarella You're not reaping CQ events, and hence you overflow the ring. Once overflown, an attempt to submit new IO will returns in a -16/-EBUSY return value. This is io_uring telling you that it won't submit more IO until you've emptied the completion ring so io_uring can flush the overflown entries to the ring. -- Jens Axboe