linux-kernel - Re: [RFC PATCH 0/2] Perf support to SDT markers

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Date:	Tue, 03 Sep 2013 17:11:02 +0200
From:	Mark Wielaard <mjw@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Hemant <hkshaw@...ux.vnet.ibm.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, srikar@...ux.vnet.ibm.com,
	peterz@...radead.org, oleg@...hat.com, mingo@...hat.com,
	anton@...hat.com, systemtap@...rceware.org
Subject: Re: [RFC PATCH 0/2] Perf support to SDT markers

On Tue, 2013-09-03 at 16:21 +0200, Ingo Molnar wrote:
> * Hemant <hkshaw@...ux.vnet.ibm.com> wrote:
> 
> > Here is an overview and a high-level-description:
> 
> Thanks, looks like a pretty useful feature - especially if SDT probes are 
> already widely present in various server binaries on a typical Linux 
> distro (are they?).

They are becoming fairly common, especially now that glibc has adopted
them. And they were designed to be source compatible with DTRACE markers
[*]. So any program that has probes for dtrace can just be recompiled on
with sys/sdt.h to get them.

My Fedora 19 box already has a couple of applications and libraries
installed that support them:

$ stap -l 'process("/usr/*/*").mark("*")' | cut -f2 -d\" | uniq -c
      9 /usr/bin/Xorg
      9 /usr/bin/Xvfb
      4 /usr/bin/c++
      4 /usr/bin/cpp
      4 /usr/bin/g++
      4 /usr/bin/gcc
      1 /usr/bin/gcov
      4 /usr/bin/gfortran
      3 /usr/bin/qemu-ga
     75 /usr/bin/qemu-img
     75 /usr/bin/qemu-io
     75 /usr/bin/qemu-nbd
    575 /usr/bin/qemu-system-i386
    575 /usr/bin/qemu-system-x86_64
     29 /usr/bin/stap
      3 /usr/bin/stapdyn
      3 /usr/bin/virtfs-proxy-helper
      4 /usr/bin/x86_64-redhat-linux-c++
      4 /usr/bin/x86_64-redhat-linux-g++
      4 /usr/bin/x86_64-redhat-linux-gcc
     13 /usr/lib/ld-2.17.so
      1 /usr/lib/libanl-2.17.so
      5 /usr/lib/libc-2.17.so
      1 /usr/lib/libgcc_s-4.8.1-20130603.so.1
     22 /usr/lib/libpthread-2.17.so
      1 /usr/lib/librt-2.17.so
      3 /usr/lib/libstdc++.so.6.0.18
     13 /usr/lib64/ld-2.17.so
      1 /usr/lib64/libanl-2.17.so
      5 /usr/lib64/libc-2.17.so
      3 /usr/lib64/libcacard.so.0.0.0
      1 /usr/lib64/libgcc_s-4.8.1-20130603.so.1
      6 /usr/lib64/libglib-2.0.so.0.3600.3
     11 /usr/lib64/libgobject-2.0.so.0.3600.3
      4 /usr/lib64/libm-2.17.so
     23 /usr/lib64/libpthread-2.17.so
      2 /usr/lib64/libpython2.7.so.1.0
      2 /usr/lib64/libpython3.3m.so.1.0
      1 /usr/lib64/librt-2.17.so
      3 /usr/lib64/libstdc++.so.6.0.18
     15 /usr/lib64/libtcl8.5.so
     41 /usr/lib64/libvirt.so.0.1000.5
     37 /usr/libexec/libvirt_lxc
     12 /usr/sbin/ldconfig
      3 /usr/sbin/libvirtd
     34 /usr/sbin/prelink
     12 /usr/sbin/sln
     37 /usr/sbin/virtlockd

[*] http://tromey.com/blog/?p=687

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