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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 4F6E4C32751 for ; Wed, 7 Aug 2019 13:44:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21F7E21E70 for ; Wed, 7 Aug 2019 13:44:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388440AbfHGNoF (ORCPT ); Wed, 7 Aug 2019 09:44:05 -0400 Received: from verein.lst.de ([213.95.11.211]:37842 "EHLO verein.lst.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388240AbfHGNoE (ORCPT ); Wed, 7 Aug 2019 09:44:04 -0400 Received: by verein.lst.de (Postfix, from userid 2407) id 986EA68B20; Wed, 7 Aug 2019 15:44:01 +0200 (CEST) Date: Wed, 7 Aug 2019 15:44:01 +0200 From: Christoph Hellwig To: John Paul Adrian Glaubitz Cc: Christoph Hellwig , Tony Luck , Fenghua Yu , Arnd Bergmann , Greg Kroah-Hartman , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: RFC: remove sn2, hpsim and ia64 machvecs Message-ID: <20190807134401.GA14792@lst.de> References: <20190807133049.20893-1-hch@lst.de> <0b5ef759-06c7-4f12-5e8b-ce35d2f25b5c@physik.fu-berlin.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0b5ef759-06c7-4f12-5e8b-ce35d2f25b5c@physik.fu-berlin.de> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 07, 2019 at 03:35:37PM +0200, John Paul Adrian Glaubitz wrote: > Hi Christoph! > > On 8/7/19 3:30 PM, Christoph Hellwig wrote: > > let me know what you think of this series. This drops the pretty much > > dead sn2 and hpsim support, which then allows us to build a single ia64 > > kernel image that supports all remaining systems without extra indirections > > in the fast path. > > Interesting. Does that mean Debian no longer needs to maintain two different > kernels for ia64, currently named "itanium" and "mckinley"? I don't think so. Assumeing one of them sets CONFIG_ITANIUM and the other just CONFIG_MCKINLEY, the first one already covers everything that the second can. But assuming both set CONFIG_IA64_GENERIC they should both get a little faster as a lot of indirect calls there just exist for SN2 are gone with this. And if my memory serves me right indirect calls have always been rather expensive on ia64 vs other architectures (at least before spectre mitigations made others slower as well). > > Adrian > > -- > .''`. John Paul Adrian Glaubitz > : :' : Debian Developer - glaubitz@debian.org > `. `' Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de > `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913 ---end quoted text---