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systemtap: a linux trace/probe tool
Visit the project web site at <http://sources.redhat.com/systemtap>,
for documentation and mailing lists for developers and users.
This is free software.
See the COPYING file for redistribution/modification terms.
See the INSTALL file for generic build instructions.
Prerequisites:
- linux kernel with kprobes (mainline 2.6.11+ or backport)
- kernel module build environment (kernel-devel or kernel-smp-devel rpm)
- kernel debugging information (kernel-debuginfo rpm)
- C compiler (same as what kernel was compiled with)
- elfutils with libdwfl (possible to reuse system elfutils if new and
complete enough, otherwise download source snapshot and build
together with systemtap as follows)
- root privileges
Installation steps:
- Install the kernel-debuginfo, kernel-[smp-]devel, gcc packages.
- Install the systemtap package, if one already exists.
Build steps:
- Install the kernel-debuginfo, kernel-[smp-]devel, gcc packages
(or see below if you are building your own kernels from source).
- Download the latest elfutils snapshot:
ftp://sources.redhat.com/pub/systemtap/elfutils/elfutils-NNNN.tar.gz
ftp://sources.redhat.com/pub/systemtap/elfutils/elfutils-portability.patch
- Untar the snapshot in some new directory; apply patch (don't ask, long story)
- Download systemtap sources snapshot or from CVS:
ftp://sources.redhat.com/pub/systemtap/snapshots/
(or)
cvs -d :pserver:anoncvs@sources.redhat.com:/cvs/systemtap login
# enter "anoncvs" as the password
cvs -d :pserver:anoncvs@sources.redhat.com:/cvs/systemtap co src
- Build it:
cd src
./configure --with-elfutils=PATCHED-ELFUTILS-DIR [other autoconf options]
make all check
make install
Tips:
- Systemtap looks for the debug info in these locations:
/boot/vmlinux-`uname -r`
/usr/lib/debug/lib/modules/`uname -r`/vmlinux
/lib/modules/`uname -r`/vmlinux
Building a kernel.org kernel:
- Build the kernel using your normal procedures. Enable
CONFIG_DEBUG_INFO, CONFIG_KPROBES, and optionally CONFIG_RELAY and
CONFIG_DEBUG_FS.
- Boot into the kernel.
- Make sure the large unstripped kernel image 'vmlinux' from your
build can be found by systemtap (see above) You can just symlink
it to one of these locations.
- Symlink your source directory to these two places, though systemtap
does not at present use such source code.
- /usr/src/kernels/`uname -r`
- /lib/modules/`uname -r`/source
- Symlink your build directory to here:
- /lib/modules/`uname -r`/build
- For example, if your kernel source is in /home/me/linux/2.6.17-rc6
and you build your kernel in the source directory, you would do
this (be sure you are running the right kernel or `uname -r`
will be wrong:)
ln -s /home/me/linux/2.6.17-rc6/vmlinux /boot/vmlinux-`uname -r`
mkdir /usr/src/kernels (if needed)
ln -s /home/me/linux/2.6.17-rc6 /usr/src/kernels/`uname -r`
mkdir /lib/modules/`uname -r` (if needed)
ln -s /home/me/linux/2.6.17-rc6 /lib/modules/`uname -r`/build
ln -s /home/me/linux/2.6.17-rc6 /lib/modules/`uname -r`/source
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