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=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT 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 0B9B7C43381 for ; Wed, 6 Mar 2019 23:09:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D2ECC20684 for ; Wed, 6 Mar 2019 23:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726252AbfCFXJ4 (ORCPT ); Wed, 6 Mar 2019 18:09:56 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:57471 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725788AbfCFXJ4 (ORCPT ); Wed, 6 Mar 2019 18:09:56 -0500 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 69B4A80192; Thu, 7 Mar 2019 00:09:47 +0100 (CET) Date: Thu, 7 Mar 2019 00:09:53 +0100 From: Pavel Machek To: Andi Kleen Cc: Ravi Bangoria , lkml , Jiri Olsa , Peter Zijlstra , linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , eranian@google.com, vincent.weaver@maine.edu, "Naveen N. Rao" Subject: Re: System crash with perf_fuzzer (kernel: 5.0.0-rc3) Message-ID: <20190306230953.GC7915@amd> References: <7c7ec3d9-9af6-8a1d-515d-64dcf8e89b78@linux.ibm.com> <20190125160056.GG6118@tassilo.jf.intel.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Sr1nOIr3CvdE5hEN" Content-Disposition: inline In-Reply-To: <20190125160056.GG6118@tassilo.jf.intel.com> 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 --Sr1nOIr3CvdE5hEN Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri 2019-01-25 08:00:56, Andi Kleen wrote: > > [Fri Jan 25 10:28:53 2019] perf: interrupt took too long (2501 > 2500),= lowering kernel.perf_event_max_sample_rate to 79750 > > [Fri Jan 25 10:29:08 2019] perf: interrupt took too long (3136 > 3126),= lowering kernel.perf_event_max_sample_rate to 63750 > > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (4140 > 3920),= lowering kernel.perf_event_max_sample_rate to 48250 > > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (5231 > 5175),= lowering kernel.perf_event_max_sample_rate to 38000 > > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (6736 > 6538),= lowering kernel.perf_event_max_sample_rate to 29500 >=20 > These are fairly normal. Unfortunately, they are. Could we set up our defaults so that they don't normally happen? pavel@amd:~/g/unicsy_demo$ dmesg | grep "took too" [ 761.507893] perf: interrupt took too long (2516 > 2500), lowering kernel.perf_event_max_sample_rate to 79250 [ 4736.674595] perf: interrupt took too long (3209 > 3145), lowering kernel.perf_event_max_sample_rate to 62250 pavel@amd:~/g/unicsy_demo$ --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --Sr1nOIr3CvdE5hEN Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlyAU0EACgkQMOfwapXb+vJTEQCghbIoqocOdk1rDwJsoRb7+0Jp IbMAoL+bib41Od+R688k6MrE2rLmkTxQ =14SK -----END PGP SIGNATURE----- --Sr1nOIr3CvdE5hEN--