From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 49520 invoked by alias); 23 Jun 2016 13:47:37 -0000 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org Received: (qmail 49507 invoked by uid 89); 23 Jun 2016 13:47:37 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.3 required=5.0 tests=BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=sk:dsmith@, dsmithredhatcom, dsmith@redhat.com, U*dsmith X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Thu, 23 Jun 2016 13:47:26 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1C92E62668; Thu, 23 Jun 2016 13:47:25 +0000 (UTC) Received: from t540p.usersys.redhat.com (dhcp-10-15-1-6.hsv.redhat.com [10.15.1.6]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u5NDlOgG019411 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 23 Jun 2016 09:47:24 -0400 Subject: Re: exercising current aarch64 kprobe support with systemtap To: William Cohen , David Long , systemtap@sourceware.org, Pratyush Anand , Mark Brown References: <8f40d0b9-5550-92f9-d1c5-8769f52304c0@redhat.com> <576B5501.1030106@linaro.org> <3adfefee-7f69-5621-301e-25db1bcd67df@redhat.com> Cc: Jeremy Linton From: David Smith Message-ID: <13655c47-87d4-a290-d495-9ec07f30cf82@redhat.com> Date: Thu, 23 Jun 2016 13:47:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <3adfefee-7f69-5621-301e-25db1bcd67df@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2016-q2/txt/msg00277.txt.bz2 On 06/23/2016 08:42 AM, William Cohen wrote: ... stuff deleted ... > When running the tests on various kernels I typically see message about the hrtimer > interrupt like the following during the run: > > ... > Running /root/systemtap_write/systemtap/testsuite/systemtap.onthefly/kprobes_onthefly.exp ... > [ 197.217699] stap_ab30d3b6ca1d8e512f40980479fd57e_18018: module verification failed: signature and/or required key missing - tainting kernel > [ 534.166223] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enabled or kernel.sched_schedstats=1 > [ 534.205668] hrtimer: interrupt took 241848 ns > ... The hrtimer interrupt message is PR20286. This appears on more than just aarch64. Basically the hrtimer probe handler took too long and the next one has been skipped. We decided there wasn't really anything we could do. -- David Smith dsmith@redhat.com Red Hat http://www.redhat.com 256.217.0141 (direct) 256.837.0057 (fax)