From owner-svn-src-head@freebsd.org Sat Aug 24 20:44:01 2019 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id C8569CAB2D; Sat, 24 Aug 2019 20:44:01 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 46G9Gn3BYGz48Gr; Sat, 24 Aug 2019 20:44:00 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id x7OKhrLO084883 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Sat, 24 Aug 2019 23:43:56 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua x7OKhrLO084883 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id x7OKhrVL084882; Sat, 24 Aug 2019 23:43:53 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Sat, 24 Aug 2019 23:43:53 +0300 From: Konstantin Belousov To: Conrad Meyer Cc: src-committers , svn-src-all , svn-src-head Subject: Re: svn commit: r351456 - head/sys/amd64/amd64 Message-ID: <20190824204353.GH71821@kib.kiev.ua> References: <201908241528.x7OFSemm026182@repo.freebsd.org> <20190824161503.GA71821@kib.kiev.ua> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on tom.home X-Rspamd-Queue-Id: 46G9Gn3BYGz48Gr X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-6.90 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; REPLY(-4.00)[]; NEURAL_HAM_SHORT(-0.91)[-0.906,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Aug 2019 20:44:01 -0000 On Sat, Aug 24, 2019 at 11:47:52AM -0700, Conrad Meyer wrote: > On Sat, Aug 24, 2019 at 9:15 AM Konstantin Belousov wrote: > > > > On Sat, Aug 24, 2019 at 08:49:42AM -0700, Conrad Meyer wrote: > > > Hi Konstantin, > > > > > > What is the motivation for this change? The commit message doesn't > > > really describe why it was done. > > > > Really it does. There is no point to request allocations for e.g. > > doublefault stack to be at the local domain, because this stack is only > > used once. Doublefault is definitely a machine halt situation, it does > > not matter if it generates inter-socket traffic to handle. > > > > Same for boot stacks, and for mce. > > > > The change avoids unnecessary constraints. > > Sure, but what is the harm of the unnecessary constraints? Does this > change fix an actual bug, or is it just a stylistic preference to > avoid domain-specific allocations for infrequently used objects? I am not sure about this being a stylistic preference. We usually write code to express the required actions. I removed constraints which did not added anything neither to code correctness nor to the performance.