Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754312Ab3JaNYS (ORCPT ); Thu, 31 Oct 2013 09:24:18 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38489 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753660Ab3JaNYR (ORCPT ); Thu, 31 Oct 2013 09:24:17 -0400 Subject: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers: From: Mark Wielaard To: Ingo Molnar Cc: Pekka Enberg , Masami Hiramatsu , "Frank Ch. Eigler" , Pekka Enberg , Hemant Kumar , LKML , Srikar Dronamraju , Peter Zijlstra , Oleg Nesterov , hegdevasant@linux.vnet.ibm.com, Ingo Molnar , anton@redhat.com, systemtap@sourceware.org, Namhyung Kim , aravinda@linux.vnet.ibm.com, dsahern@gmail.com, "yrl.pp-manager.tt@hitachi.com" In-Reply-To: <20131031105759.GB12066@gmail.com> References: <20131023044511.1886.82571.stgit@hemant-fedora> <20131023050502.1886.15779.stgit@hemant-fedora> <5270D9F7.3090105@hitachi.com> <5270F2DE.6040505@iki.fi> <1383216886.6521.5910.camel@bordewijk.wildebeest.org> <20131031105759.GB12066@gmail.com> Content-Type: text/plain; charset="UTF-8" Date: Thu, 31 Oct 2013 14:23:26 +0100 Message-ID: <1383225806.6521.6105.camel@bordewijk.wildebeest.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1492 Lines: 39 On Thu, 2013-10-31 at 11:57 +0100, Ingo Molnar wrote: > * Mark Wielaard wrote: > > On Wed, 2013-10-30 at 13:51 +0200, Pekka Enberg wrote: > > > On 10/30/13 12:05 PM, Masami Hiramatsu wrote: > > > > To find all system libraries, we can use ldconfig. > > > > > > > > $ ldconfig --print-cache > > > > > > > > shows what dynamic libraries will be loaded. On my own laptop (running > > > > ubuntu13.04) shows ~1000 libs. > > > > > > Good point. That definitely narrows down the scanned set. > > > > It is fast. But that would miss the various libjvm.so variants for > > example. Or other programs, like libreoffice, which have SDT > > probes in their internal shared libraries that aren't in the > > default ldconfig paths. > > I suppose those Java libraries ought to show up in > /etc/prelink.cache though, right? Good point. Yes, all executables and libraries I was missing in ldconfig --print-cache do show up with prelink -p. Except libjvm.so itself... Apparently prelink is convinced that really is never used. hmmm. Apparently all wrapper "java" executables only dlopen it, so it is never directly linked, and prelink doesn't cache it. But except for that special case, prelink -p is a good substitute. Cheers, Mark -- 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/