Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753087Ab3J2Tyo (ORCPT ); Tue, 29 Oct 2013 15:54:44 -0400 Received: from mail-wi0-f171.google.com ([209.85.212.171]:35328 "EHLO mail-wi0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751998Ab3J2Tyn (ORCPT ); Tue, 29 Oct 2013 15:54:43 -0400 MIME-Version: 1.0 In-Reply-To: <1383058315.6521.3158.camel@bordewijk.wildebeest.org> References: <20131023044511.1886.82571.stgit@hemant-fedora> <20131023050502.1886.15779.stgit@hemant-fedora> <526E4940.8000608@hitachi.com> <526E5BA5.7050103@iki.fi> <20131028141152.GA1040@linux.vnet.ibm.com> <526E72EC.9060400@iki.fi> <20131028173152.GB1040@linux.vnet.ibm.com> <526EA366.4020204@iki.fi> <526F2949.5000208@hitachi.com> <1383058315.6521.3158.camel@bordewijk.wildebeest.org> Date: Tue, 29 Oct 2013 21:54:41 +0200 X-Google-Sender-Auth: dSgneP1xwt5YE8X_VGMdnA6RlF0 Message-ID: Subject: Re: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers: From: Pekka Enberg To: Mark Wielaard Cc: Masami Hiramatsu , Srikar Dronamraju , Hemant Kumar , LKML , Peter Zijlstra , Oleg Nesterov , hegdevasant@linux.vnet.ibm.com, Ingo Molnar , Anton Arapov , systemtap@sourceware.org, Namhyung Kim , aravinda@linux.vnet.ibm.com Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1157 Lines: 22 On Tue, Oct 29, 2013 at 4:51 PM, Mark Wielaard wrote: > A nice user case to think about when designing this interface might be > the java hotspot jvm (libjvm.so). It has SDT markers with the same name > that might occur at multiple addresses depending on code path taken or > compiler optimization. And there are multiple libjvm.so variants > depending on whether the user uses the client or server VM. And users > often have multiple major versions installed (both 1.6 and 1.7 are > currently being shipped by some distros and can be installed in > parallel). > > Normally a user that wants to monitor say the hotspot:gc__begin SDT > probe wants to see that probe in whatever code path it happens and in > whatever libjvm.so happens to be running (client or server and 1.6 or > 1.7 version). But might still want to be able to specify a specific > variant. Agreed, it's an excellent use case. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/