From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Daniele Nicolodi Newsgroups: gmane.emacs.devel Subject: Re: New GC concept Date: Mon, 7 Jun 2021 21:51:45 +0200 Message-ID: <29607b7f-2286-c8c4-a693-cc715a4c26d4@grinta.net> References: <874ke9h97y.fsf@rfc20.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="4016"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Jun 07 21:52:31 2021 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lqLIV-0000sM-74 for ged-emacs-devel@m.gmane-mx.org; Mon, 07 Jun 2021 21:52:31 +0200 Original-Received: from localhost ([::1]:37194 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lqLIU-0001ow-8A for ged-emacs-devel@m.gmane-mx.org; Mon, 07 Jun 2021 15:52:30 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:33940) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lqLHw-00019i-KY for emacs-devel@gnu.org; Mon, 07 Jun 2021 15:51:56 -0400 Original-Received: from grinta.net ([109.74.203.128]:47438) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lqLHs-0005UJ-Gz for emacs-devel@gnu.org; Mon, 07 Jun 2021 15:51:56 -0400 Original-Received: from black.local (p4fe717e2.dip0.t-ipconnect.de [79.231.23.226]) (Authenticated sender: daniele) by grinta.net (Postfix) with ESMTPSA id 1AE5CE07FD for ; Mon, 7 Jun 2021 19:51:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=grinta.net; s=2020; t=1623095507; bh=NgUQK0kmrIz504Tx4mbVJCqIQdDe+Z8BwDKO6ixKdsw=; h=Subject:To:References:From:Date:In-Reply-To:From; b=DHt5zFThwB3PpX99ImcpjHP8bWrsykmXswS40Hz/rpfffodMc6fvDk0z7I39hk7in ZQanjaYvd9CiC0ssbNVGR7o3xKUYb7SM5ZRXbh0Smh6edXhJQciKunq07kWBppql2c yz9//O28/9pgMHEu/wU+DiOl7iSkf/7Z/tzytpNzoQh7/2nU+SxAe1GIp+LUyl+qva wZwTK9gAMp07ZF9BoOajjTIOSydaRTd3UXf1rK8+1UNaH9297eN51fvfbDsSGrHWJQ JgDjnEcwoZ5Jxqw793Y7PKcRDS8qFk86xTTCsYJAwLETcJRWzF5llBbK0z76QnsQDm EweeTx7fqcblA== In-Reply-To: Content-Language: en-US Received-SPF: pass client-ip=109.74.203.128; envelope-from=daniele@grinta.net; helo=grinta.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:270534 Archived-At: On 07/06/2021 20:03, Daniel Colascione wrote: > On 6/7/21 10:32 AM, Matt Armstrong wrote: >> I'm curious about the answer to one of the unanswered questions in your >> alloc.c FAQ: What about systems without virtual memory? Asked another >> way: can we reasonably expect to entirely replace the current GC with >> this new one? Are there platforms Emacs supports today that would be >> left behind? > > We can definitely replace the existing GC with the new GC everywhere. > I've designed the new GC to work on systems without virtual memory > facilities. On these systems, we'll have to run the GC in > non-concurrent, non-generational mode, but that's no regression from > what we have today. We'll also probably want to use a smaller block size > on these systems to reduce fragmentation overhead. Isn't DOS the only system in this class? (It is not a rhetorical question: a while ago I asked which systems are officially supports and the answer was that all systems that currently run Emacs are supported). Does it make sense to still support DOS? Cheers, Dan