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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 7C9AAC4360F for ; Tue, 2 Apr 2019 15:28:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 471A82082C for ; Tue, 2 Apr 2019 15:28:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729770AbfDBP2h (ORCPT ); Tue, 2 Apr 2019 11:28:37 -0400 Received: from semf04.mfg.siteprotect.com ([64.26.60.167]:56868 "EHLO semf04.mfg.siteprotect.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726685AbfDBP2h (ORCPT ); Tue, 2 Apr 2019 11:28:37 -0400 X-Greylist: delayed 2045 seconds by postgrey-1.27 at vger.kernel.org; Tue, 02 Apr 2019 11:28:37 EDT Received: from smtpauth01.mfg.siteprotect.com ([64.26.60.150]) by semf04.mfg.siteprotect.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1hBKnh-0006h6-Rp; Tue, 02 Apr 2019 10:54:17 -0400 Received: from pianoman.cluster.toy (unknown [100.16.227.202]) (Authenticated sender: vince@deater.net) by smtpauth01.mfg.siteprotect.com (Postfix) with ESMTPSA id 44YXKB5fBDz162BwM; Tue, 2 Apr 2019 10:53:50 -0400 (EDT) Date: Tue, 2 Apr 2019 10:53:38 -0400 (EDT) From: Vince Weaver X-X-Sender: vince@pianoman.cluster.toy To: Cyrill Gorcunov cc: Peter Zijlstra , "Lendacky, Thomas" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Arnaldo Carvalho de Melo , Alexander Shishkin , Ingo Molnar , Borislav Petkov , Namhyung Kim , Thomas Gleixner , Jiri Olsa , Stephane Eranian Subject: Re: [RFC PATCH v3 0/3] x86/perf/amd: AMD PMC counters and NMI latency In-Reply-To: <20190402132200.GA23501@uranus> Message-ID: References: <155415519143.24457.2706922532995302758.stgit@tlendack-t1.amdoffice.net> <20190402130302.GL12232@hirez.programming.kicks-ass.net> <20190402132200.GA23501@uranus> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Authentication-Results: mfg.siteprotect.com; auth=pass smtp.auth=vince@deater.net smtp.mailfrom= X-Originating-IP: 64.26.60.150 X-portal.siteprotect.com-Domain: mfg.outbound X-portal.siteprotect.com-Username: 64.26.60.150/31 Authentication-Results: mfg.siteprotect.com; auth=pass smtp.auth=64.26.60.150/31@mfg.outbound X-portal.siteprotect.com-Outgoing-Class: ham X-portal.siteprotect.com-Outgoing-Evidence: Combined (0.21) X-Recommended-Action: accept X-Filter-ID: EX5BVjFpneJeBchSMxfU5uVLfX9KsQzQ8XdKn7ZAcWp602E9L7XzfQH6nu9C/Fh9KJzpNe6xgvOx q3u0UDjvO80kiOOXohirsWhwY064v2npeso7Ho1FT6opA0QnLMBdpVMzexAGJZ2+mPn7fP4I3bGQ T8H3NmQhNu2O3z+K3mZwnXeuRadH9eS/0qlAQIeNVTCxY3GOeQ66b90JBslLPIYZZS/DUBLA5nGN 6cIn1z9sSeI2joq9+ZZE6ghVOZbTTcd1LQTPB4kZ4onMihMMZ7yZgsqocyZY4jxjE3qUu/6r1AV5 UTHwbtCAXgD9KinxOsXa9bPF5P+TU1Hkgqx+i85wXGAwCBBM9Wuz7xpUTUsouBFVfnbvOnQHVZOr UVdzPmpotkU9W6DwXKJZEzKGAWFx656NU5IkTRH0Up7qB8Lzno4t3kssqrr3QsvSu8BVGE1lcStX Kcni7YkebcsPef+Bu4/uGdQrw1B0vCxVYoig1tMG8QVeXDZzT/jhEuU0P3dyVpD6b6jIZhxNG0yA pgS8oWDbSKQ3tXcknJwLqWmW2UPE+vsQVOjHQoB8kKI5VBlSQp3tVGVu81giwHSvsh/iSK71nlwT kZ/FUjBxvQvLVJD2VTUQ+kGxg2Pv3GfZNme3cik5CexJz1ox3HYe0QjaC0seZkfC0iy+spcexjk7 SHzg1GyOaFo+K3vVD2LSW+n8Hj6CJNEWfIqe3AMrex08L8pZyQFEYMQabfOl4IqgLgoO+53/F59y H4idlSUpteH5C3/pSoxYOXdzgcqBafjL6IM/NPtmtMb38N+gNB/lgTl6fJxyntEfhZCKje4ZwyYO nmpuMeHRjSmbB6RrUkSyszVtUeslVn8uY5bzuQsgr/U0flMcy2Vi/IcBgY4amwfEOQVUNYnWQ300 Dp6cJDE37L8A/sfCSfmp70N6CAkwoGPe+nvh19VPEW3k7miLRGgHloEW8jEP1L/Rx27Xzz69xZ5Y e0WAUxsN5HA7UNtNfZRkU/qlxUHc6GOTsYb1GisIGxUJr7hu9AMHjQD/EXDMIS0tLJXIAOtcIzBo I6meQp3k9SVx0LF1z2PwQHAv6PNCU/yT9rVFGLmNNL3pin9QfQfyieJWOKWrOSedp3uDSq3Q+WKe 0YMArNQQ+c/cjrZXLGyv7MvlzLexb6aw2QRJ2i4lIocCm92ve//7+ElEMKkVAsdKzMH3lcQE8m4M ZuM7jUXIESohoO51xWmU8XetsAn+dGLdW9wFnbfnLqlYLystwlXwpaZB/1+bghnKhieaPV2+qeEY bMldDm0nFNF8d4YLM/kll0Q7WT6bKEPylIuYEMGLGYbBbBR3JTh3+HGJA0RGaAhm/MWtyZJn3DMa IL48SHdwBur7C9FrSAVwMG9k36g/7bjS2E6qjwtRGvsY2hs/S+9Z3xB10KGOcqjxugQ/FndyXRUg v2aA0ZQ= X-Report-Abuse-To: spam@semfq01.mfg.siteprotect.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2 Apr 2019, Cyrill Gorcunov wrote: > On Tue, Apr 02, 2019 at 03:03:02PM +0200, Peter Zijlstra wrote: > > I have vague memories of the P4 thing crashing with Vince's perf_fuzzer, > > but maybe I'm wrong. > > No, you're correct. p4 was crashing many times before we manage to make > it more-less stable. The main problem though that to find working p4 box > is really a problem. I do have some a functioning p4 system I can test on. I can easily run the fuzzer and report crashes, but I only have limited time/skills to actually fix the problems it turns up. One nice thing is that as of Linux 5.0 *finally* the fuzzer can run indefinitely on most modern Intel chips without crashing (still triggers a few warnings). So finally we have the ability to tell when a new crash is a regression and potentially can bisect it. Although obviously this doesn't necessarily apply to the p4. I do think the number of people trying to run perf on a p4 is probably pretty small these days. Vince