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([2620:10d:c092:600::1:b3cc]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-432bd5dfa07sm50461305f8f.25.2026.01.14.06.30.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 14 Jan 2026 06:30:07 -0800 (PST) Message-ID: <726eb675-c3c9-4a81-abd6-e5bd44e383fe@gmail.com> Date: Wed, 14 Jan 2026 14:30:03 +0000 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH liburing 1/1] man: add io_uring_register_region.3 To: Gabriel Krisman Bertazi Cc: io-uring@vger.kernel.org, axboe@kernel.dk References: <6ba5f1669bfe047ed790ee47c37ca63fd65b05de.1768334542.git.asml.silence@gmail.com> <87ldi12o91.fsf@mailhost.krisman.be> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <87ldi12o91.fsf@mailhost.krisman.be> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DKIM: signer='gmail.com' status='pass' reason='' DKIMCheck: Server passes DKIM test, 0 Spam score X-Spam-Score: 0.4 (/) X-Spam-Report: Spam detection software, running on the system "witcher.mxrouting.net", has performed the tests listed below against this email. Information: https://mxroutedocs.com/directadmin/spamfilters/ --- Content analysis details: (0.4 points) --- pts rule name description ---- ---------------------- ----------------------------------------- 0.0 RCVD_IN_DNSWL_BLOCKED RBL: ADMINISTRATOR NOTICE: The query to DNSWL was blocked. See http://wiki.apache.org/spamassassin/DnsBlocklists#DnsBlocklists-dnsbl-block for more information. [172.232.135.74 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider [asml.silence[at]gmail.com] 1.5 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level mail domains are different -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.0 FREEMAIL_FORGED_FROMDOMAIN 2nd level domains in From and EnvelopeFrom freemail headers are different -1.0 MAILING_LIST_MULTI Multiple indicators imply a widely-seen list manager SpamTally: Final spam score: 4 On 1/13/26 21:31, Gabriel Krisman Bertazi wrote: > Pavel Begunkov writes: > >> Describe the region API. As it was created for a bunch of ideas in mind, >> it doesn't go into details about wait argument passing, which I assume >> will be a separate page the region description can refer to. >> > > Hey, Pavel. Hey Gabriel, thanks for taking a look ... >> +.BR io_uring_register_region (3) >> +function registers a memory region to io_uring. The memory region can after be >> +used, for example, to pass waiting parameters to the >> +.BR io_uring_enter (2) >> +system call in an efficient manner. The >> +.IR ring > > .I ring I copied most of the macro choices from another liburing man page, I can't say if diverging them worth it and/or what is more commonly used. But in either case, I don't have any opinion on that. ... >> +.I region_uptr >> +field must contain a pointer to an appropriately filled >> +.B struct io_uring_region_desc. > > .IR struct io_uring_region_desc . > >> +.PP >> +The >> +.I flags >> +field must contain a bitmask of the following values: >> +.TP >> +.B IORING_MEM_REGION_REG_WAIT_ARG >> +allows to use the region topass waiting parameters to the > > "to pass" Oops, slipped through, thanks! >> +.BR io_uring_enter (2) >> +system call. If set, the registration is only allowed while the ring >> +is in a disabled mode. > > While the ring is disabled. I was thinking that "disabled state" is clearer, but I guess doesn't really matter, especially since R_DISABLED is mentioned. >> +.I user_addr >> +field must contain a pointer to the memory the user wants to register. It's >> +only valid if >> +.B IORING_MEM_REGION_TYPE_USER >> +is set, and should be zero otherwise. > > must be set to zero otherwise. Agreed, "must" is more appropriate here. ... >> +The >> +.I flags >> +field must contain a bitmask of the following values: >> +.TP >> +.B IORING_MEM_REGION_TYPE_USER >> +tells the kernel to use memory specified by the >> +.I user_addr >> +field. If not set, the kernel will allocate memory for the region, which can >> +then be mapped into the user space. >> + >> +.PP >> +On a successful registration of a region with kernel provided memory, the > > "On success, the" The "kernel provided memory" part is important here, which is why the sentence is expanded. -- Pavel Begunkov From - Wed Jan 14 14:34:40 2026 X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 Return-Path: Delivered-To: hi@josie.lol Received: from witcher.mxrouting.net by witcher.mxrouting.net with LMTP id AHB1GnypZ2nxyDAAYBR5ng (envelope-from ) for ; Wed, 14 Jan 2026 14:34:36 +0000 Return-path: Envelope-to: hi@josie.lol Delivery-date: Wed, 14 Jan 2026 14:34:36 +0000 Received: from sea.lore.kernel.org ([172.234.253.10]) by witcher.mxrouting.net with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.98) (envelope-from ) id 1vg1xD-0000000DmXt-3c60 for hi@josie.lol; Wed, 14 Jan 2026 14:34:36 +0000 Received: from smtp.subspace.kernel.org (conduit.subspace.kernel.org [100.90.174.1]) by sea.lore.kernel.org (Postfix) with ESMTP id 61E88301897E for ; Wed, 14 Jan 2026 14:34:33 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id AFC822D8382; Wed, 14 Jan 2026 14:34:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="f3bGrPVr" X-Original-To: io-uring@vger.kernel.org Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A361722B5A5; Wed, 14 Jan 2026 14:34:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768401272; cv=none; b=lldvE1sCGhjB98DbqKDgLcwijzOJw8NyOGCma7vdlOO+0ZOa3W824lfnwaWWhudgwLBQl6J0VE8DcubnoIyu1aD3HFVlJGOPiFahak9AhtVFaVOgRYSOzqQjuuXWogXD4Vtp+p95/sTCoITXwnDf+i/qM7ieHNHMaIHkTkivjH8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768401272; c=relaxed/simple; bh=ZQCFuaMuCZ3Fu7pNmusE4ZOKXKRidmsWIk+RMzHZ0b0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Su8UQ0gTUoPMMRqre8y75zRwvbjGclAbeT7tqeLF7d3MqlX5vIWna9QajuT+ZGzvyxH7khz4WmmWhqZIy1Oa2ODWzS9IP8OhB1AKOLQCFIETy8qZFYXR0aaRpS/frtxkf1zPZkrEuIme/Zr1tyCwmiH7x8bffvu3BxxzteecZ84= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=f3bGrPVr; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Con2023-08-24 09:48:45 +0200