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,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 0FCC2C433E0 for ; Wed, 29 Jul 2020 16:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDFF22075F for ; Wed, 29 Jul 2020 16:27:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Bxyy99ha" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726920AbgG2Q1y (ORCPT ); Wed, 29 Jul 2020 12:27:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49956 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726385AbgG2Q1y (ORCPT ); Wed, 29 Jul 2020 12:27:54 -0400 Received: from mail-qk1-x741.google.com (mail-qk1-x741.google.com [IPv6:2607:f8b0:4864:20::741]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 034B3C061794 for ; Wed, 29 Jul 2020 09:27:53 -0700 (PDT) Received: by mail-qk1-x741.google.com with SMTP id d14so22744501qke.13 for ; Wed, 29 Jul 2020 09:27:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:user-agent:in-reply-to:references:mime-version :content-transfer-encoding:subject:to:from:message-id; bh=TSOUnId3DuMbnDTET43bmbbVarii+aBx7RtYK9sFGI4=; b=Bxyy99ha50PW4hDp5OSpq2zaLscxBmrgvzCGqhIhptXqDKMOc1pynDiDso5nbUVsnO TogS7VEU8pK/ZIOzxESG3F0q+lZrooGqM592M88X1gopqe9Sn0GC1U8Zt+92sU+QruAZ eh83ZHIFIVihQDag6Goy40JdoVfHKTO5TNSingm8jl2VeQ6eVS87v9Du6z22l68EQO88 MpnedOmA59UeAOQM8rO6atV3mlVe3ukJ3TSNtAoJBgVlEkX29sq2JGkBZWw2F43a7LF8 SGJ7DCRdyG3lwchjnjuZeiIa9A/33+cBnmXyoWE/yp6+SJXK6t6hiM9E91q9VKIx/vJ8 jDcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:user-agent:in-reply-to:references :mime-version:content-transfer-encoding:subject:to:from:message-id; bh=TSOUnId3DuMbnDTET43bmbbVarii+aBx7RtYK9sFGI4=; b=JvwYaua56PElszT0It0JzzAkllMN58k9zR0x6ExNRi5kSB71V9CTP1gPosm+E0vQ6Y fS10+zViHa0MBzDSDaer9GuaV8a3rVNh7CRAaHzJqUOfBZFl54UXXPl1fH1SzY2IM9Hg iPTGP3xXz4+TKtSawtxLySy64nXorWT2/KCjZZ1VaYpythSb6QrIREMe4JrB4ZNs7dK8 sF9DphsU+3OE02Irq2bNQuff40iUnUGTfKXW0cSm3/GEK+Dtx25KV7aSo3SZNvSHkX7j v6aq7+JW0Y22cchUMc/xQhpAAReHf4CkiTbC05Ue6WNVj1Tjaju29Yi5LTXORTM/awHr pQ2g== X-Gm-Message-State: AOAM531y4H6nMc/VKIWtmuvOwqhddMaLXle/wtSy4ZhaGui9rZMmBK1N NGJJpQQ25jyiBzBpiU/6/je8V0v+WvQ= X-Google-Smtp-Source: ABdhPJz9SgAQHHXjDtUQoHgMrEtIW1VxLo/mDCm19xd3Je+oPKNdHQjstERn9hbl+gus0EUEmoPoKA== X-Received: by 2002:a05:620a:b8c:: with SMTP id k12mr33151429qkh.69.1596040073032; Wed, 29 Jul 2020 09:27:53 -0700 (PDT) Received: from RedmiNote8Pro-Redmi.localdomain ([179.97.37.151]) by smtp.gmail.com with ESMTPSA id i18sm2049270qtv.39.2020.07.29.09.27.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Jul 2020 09:27:52 -0700 (PDT) Date: Wed, 29 Jul 2020 13:27:32 -0300 User-Agent: K-9 Mail for Android In-Reply-To: <20200729160220.GB2655@hirez.programming.kicks-ass.net> References: <20200729155647.xte33krus3mak3wu@altlinux.org> <20200729160220.GB2655@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: Should perf version match kernel version? To: peterz@infradead.org, Ingo Molnar , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, "Dmitry V. Levin" From: Arnaldo Carvalho de Melo Message-ID: <7CEC30D2-0C1E-4E88-A1D2-35C121EB1013@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On July 29, 2020 1:02:20 PM GMT-03:00, peterz@infradead=2Eorg wrote: >On Wed, Jul 29, 2020 at 06:56:47PM +0300, Vitaly Chikunov wrote: >> Hi, >>=20 >> It seems that most distros try to have perf version to match with >> running kernel version=2E Is is requirement? Would it be better to have >> single perf from kernel mainline to work with any (older) kernel >> version? >>=20 >> We have different kernel versions in ALT Linux (stable for 4=2E19, 5=2E= 4, >> and 5=2E7) and I want to understand if we should have three perfs or >> single package will be enough=2E > >We strive to have it all compatible, older perf should work on newer >kernel and newer perf should work on older kernel=2E > >How well it's all tested is another=2E > >Personally I often use a very old perf=2E Yeah, never was a requirement, if you find some problem using a new perf o= n an old kernel or the other way around, please report=2E - Arnaldo --=20 Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E