SystemTap provides free software (GPL) infrastructure to simplify the gathering of information about the running Linux system.
Simply install systemtapAUR or systemtap-gitAUR, all done. Compare it to the most recent upstream release at .
Consider also building it from sources at , where support for newer kernels or distributions makes first appearance.
You will need at least the linux-headers package installed.
Because Arch permanently strips debugging data from its distributed binaries (including the kernel),
many normal/fancier systemtap capabilities are simply not available, so many examples at
/usr/share/doc/systemtap/examples will not work. However, see stapprobes(3) for the NON-DWARF and AUTO-DWARF probe types for what should still work, for example:
- kernel tracepoints: kernel.trace("*")
- user-space probes: process("...").function("...") (for programs you build yourself with -g)
- user-space markers: process("...").mark("...") (if they were configured with the <sys/sdt.h> markers)
- perfctr-based probes: perf.*
- non-dwarf kernel probes: kprobe.function("...") and nd_syscall.* tapset (if a /boot/System.map* file is available, see below).
You may consider to build a linux-custom package to run SystemTap, but rebuilding the linux package is easy and efficient.
First, follow the steps at Kernel/Arch Build System#Getting the ingredients to get the original kernel build files.
makepkg --verifysource to get the additional files. By performing the verification, you can safely skip the steps on "Update checksum".
config.x86_64, turn on these options:
By default only CONFIG_DEBUG_INFO and CONFIG_DEBUG_INFO_REDUCED are not set.
With the current linux kernel (tested with 3.15.2) you can simply append these lines into
echo ' CONFIG_DEBUG_INFO=y CONFIG_DEBUG_INFO_REDUCED=n ' >> config.x86_64
sha256sum config.x86_64 to get a new sha256sum.
In PKGBUILD file, the
sha256sum=('sum-of-first' ... 'sum-of-last') has the same order with
source=('first-source' ... 'last-source'), put your new sha256sum in the right place.
Build and install
Optional: It is recommended to set
/etc/makepkg.conf to speed up the compilation.
You will need about 12 GB disk space for this build. Consider using an in-memory tmpfs if you have large DRAM.
makepkg --skipchecksums to compile, then simply
sudo pacman -U *.pkg.tar.gz to install the packages.
pacman will tell you reinstall, and you should say y.
linux and linux-headers should be reinstalled, linux-docs does not matter.
Via this method, external modules (e.g. nvidia and virtualbox) do not need to be rebuilt.
Build custom kernel
Please reference this README
Pass 4 fails when launching
If you get the following error message, try into install systemtap-gitAUR
/usr/share/systemtap/runtime/stat.c:214:2: error: 'cpu_possible_map' undeclared (first use in this function)
System.map is missing
You can recover it where you build your linux kernel with DEBUG_INFO enabled
# cp src/linux-3.6/System.map /boot/System.map-3.6.7-1-ARCH
# cp /proc/kallsyms /boot/System.map-$(uname -r)
Process return probes not available
If you are sure that your kernel configuration is correct, but on launching
stap you get both of the following messages:
WARNING: Kernel function symbol table missing [man warning::symbols] semantic error: process return probes not available [man error::inode-uprobes]
then SystemTap may have failed to verify support for this feature. You can fix this by following the steps in #System.map is missing.