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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 77C1FC433DF for ; Sun, 2 Aug 2020 11:51:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B5BF2076B for ; Sun, 2 Aug 2020 11:51:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728074AbgHBLvj (ORCPT ); Sun, 2 Aug 2020 07:51:39 -0400 Received: from jabberwock.ucw.cz ([46.255.230.98]:50772 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726578AbgHBLvd (ORCPT ); Sun, 2 Aug 2020 07:51:33 -0400 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 16A0E1C0BD4; Sun, 2 Aug 2020 13:51:31 +0200 (CEST) Date: Sun, 2 Aug 2020 13:51:24 +0200 From: Pavel Machek To: Vitaly Chikunov Cc: Arnaldo Carvalho de Melo , peterz@infradead.org, Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, "Dmitry V. Levin" Subject: Re: Should perf version match kernel version? Message-ID: <20200802115124.GA1044@bug> References: <20200729155647.xte33krus3mak3wu@altlinux.org> <20200729160220.GB2655@hirez.programming.kicks-ass.net> <7CEC30D2-0C1E-4E88-A1D2-35C121EB1013@gmail.com> <20200729175704.gsbh4gkbqxas5j2t@altlinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200729175704.gsbh4gkbqxas5j2t@altlinux.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > >We strive to have it all compatible, older perf should work on newer > > >kernel and newer perf should work on older kernel. > > > > > >How well it's all tested is another. > > > > > >Personally I often use a very old perf. > > > > Yeah, never was a requirement, if you find some problem using a new perf on an old kernel or the other way around, please report. > > That's great to know. Thanks for the answers! Someone should tell debian, AFAICT they believe perf version == kernel version is a requirement...and so says their manpage. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html