From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Nelson Subject: Re: -fno-omit-frame-pointer Date: Mon, 23 Feb 2015 15:35:19 -0600 Message-ID: <54EB9D17.7090509@redhat.com> References: <54E91449.4090000@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([209.132.183.28]:56557 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752157AbbBWVfX (ORCPT ); Mon, 23 Feb 2015 16:35:23 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t1NLZM1Y009298 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Mon, 23 Feb 2015 16:35:22 -0500 In-Reply-To: <54E91449.4090000@redhat.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Sage Weil Cc: ceph-devel@vger.kernel.org On 02/21/2015 05:27 PM, Mark Nelson wrote: > I've still had the best luck using DWARF though. I was able to get much > better stack traces with it. A semi-modern kernel with libunwind > support in perf is needed though. I just checked one of our RHEL7 and > it sadly doesn't look like they have it linked. We really should hassle > them to get this in. Perf on our Ubuntu 14.04 does use libunwind, > primarily due to the kernel bug we submitted: > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248289 FWIW, I followed up with the RHEL7 kernel guys who pointed out that while RHEL 7.0 doesn't have dwarf support in perf, 7.1 does, and it's using what appears to be a better libdw unwind implementation: http://lwn.net/Articles/579508/ > > Mark > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html