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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6409C433E6 for ; Mon, 15 Feb 2021 20:09:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7686264EBB for ; Mon, 15 Feb 2021 20:09:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229713AbhBOUI7 convert rfc822-to-8bit (ORCPT ); Mon, 15 Feb 2021 15:08:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41774 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229520AbhBOUI4 (ORCPT ); Mon, 15 Feb 2021 15:08:56 -0500 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49354C061574; Mon, 15 Feb 2021 12:08:16 -0800 (PST) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: krisman) with ESMTPSA id 76F7D1F45078 From: Gabriel Krisman Bertazi To: =?utf-8?Q?Andr=C3=A9?= Almeida Cc: Thomas Gleixner , Ingo Molnar , Peter Zijlstra , Darren Hart , linux-kernel@vger.kernel.org, Steven Rostedt , Sebastian Andrzej Siewior , kernel@collabora.com, pgriffais@valvesoftware.com, z.figura12@gmail.com, joel@joelfernandes.org, malteskarupke@fastmail.fm, linux-api@vger.kernel.org, fweimer@redhat.com, libc-alpha@sourceware.org, linux-kselftest@vger.kernel.org, shuah@kernel.org, acme@kernel.org, corbet@lwn.net Subject: Re: [RFC PATCH 03/13] futex2: Implement vectorized wait Organization: Collabora References: <20210215152404.250281-1-andrealmeid@collabora.com> <20210215152404.250281-4-andrealmeid@collabora.com> Date: Mon, 15 Feb 2021 15:08:11 -0500 In-Reply-To: <20210215152404.250281-4-andrealmeid@collabora.com> (=?utf-8?Q?=22Andr=C3=A9?= Almeida"'s message of "Mon, 15 Feb 2021 12:23:54 -0300") Message-ID: <87a6s5w0us.fsf@collabora.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org André Almeida writes: > Add support to wait on multiple futexes. This is the interface > implemented by this syscall: > > futex_waitv(struct futex_waitv *waiters, unsigned int nr_futexes, > unsigned int flags, struct timespec *timo) Sorry for the second email in a row. But, if futex_wake is just a futex_wakev with nr_futexes == 1, why do we need two syscalls for that? Why not only have futex_waitv? -- Gabriel Krisman Bertazi