Difference between revisions of "SystemTap"

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{{Category: Kernel}}
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[[Category:Kernel]]
 
[[zh-CN:Systemtap]]
 
[[zh-CN:Systemtap]]
 
[http://sourceware.org/systemtap/ Systemtap] provides free software (GPL)
 
[http://sourceware.org/systemtap/ Systemtap] provides free software (GPL)
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By default only ''CONFIG_DEBUG_INFO'' and ''CONFIG_KPROBES'' are not set.
 
By default only ''CONFIG_DEBUG_INFO'' and ''CONFIG_KPROBES'' are not set.
  
With current core/linux (3.3.8) you can simply append these lines into config[.x86_64]:
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With current core/linux (3.5.4) you can simply append these lines into config[.x86_64]:
{{hc|x86_64|<nowiki>
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{{hc|x86_64|
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<nowiki>
 
echo '
 
echo '
 
CONFIG_UTRACE=y
 
CONFIG_UTRACE=y
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CONFIG_X86_DECODER_SELFTEST=n
 
CONFIG_X86_DECODER_SELFTEST=n
 
' >> config.x86_64
 
' >> config.x86_64
 
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</nowiki>
</nowiki>}}
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}}
  
 
===update checksum===
 
===update checksum===
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==Build custom kernel==
 
==Build custom kernel==
 
Please reference this [http://sourceware.org/git/?p=systemtap.git;a=blob_plain;f=README;hb=HEAD README]
 
Please reference this [http://sourceware.org/git/?p=systemtap.git;a=blob_plain;f=README;hb=HEAD README]
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==Troubleshooting==
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=== Pass 4 fails when launching ===
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If you have:
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    /usr/share/systemtap/runtime/stat.c:214:2: error: 'cpu_possible_map' undeclared (first use in this function)
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Try to install systemtap-git package
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=== System.tap is missing ===
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You can recover it where you build your linux kernel with DEBUG_INFO enabled
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    cp src/linux-3.6/System.map /boot/System.map-3.6.7-1-ARCH

Revision as of 12:27, 29 November 2012

Systemtap provides free software (GPL) infrastructure to simplify the gathering of information about the running Linux system.

Easy and fast

Officially, it is recommended to build a linux-custom package to run systemtap, but rebuilding the original linux package can be very easy and efficient.

Prepare

You can run sudo abs; cp -r /var/abs/core/linux . to get the original kernel build files.

modify config

Edit config (for 32-bit systems) or config.x86_64 (for 64-bit systems), turn on these options:

  • CONFIG_DEBUG_INFO=y
  • CONFIG_KPROBES=y
  • CONFIG_RELAY=y
  • CONFIG_DEBUG_FS=y
  • CONFIG_MODULES=y
  • CONFIG_MODULE_UNLOAD=y
  • CONFIG_UTRACE=y

By default only CONFIG_DEBUG_INFO and CONFIG_KPROBES are not set.

With current core/linux (3.5.4) you can simply append these lines into config[.x86_64]:

x86_64

echo '
CONFIG_UTRACE=y
CONFIG_KPROBES=y
CONFIG_KPROBES_SANITY_TEST=n
CONFIG_KPROBE_EVENT=y
CONFIG_NET_DCCPPROBE=m
CONFIG_NET_SCTPPROBE=m
CONFIG_NET_TCPPROBE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_REDUCED=n
CONFIG_X86_DECODER_SELFTEST=n
' >> config.x86_64

update checksum

Run md5sum config[.x86_64] to get a new md5sum.

In PKGBUILD file, the md5sums=('sum-of-first' ... 'sum-of-last') has the same order with source=('first-source' ... 'last-source'), put your new md5sum in the right place.

Build and Install

Optional: you can set MAKEFLAGS="-j16" in /etc/makepkg.conf to speed up the compilation.

Run makepkg to compile, then simply sudo pacman -U *.pkg.tar.gz to install the packages. pacman will tell you reinstall, That's great!

linux and linux-headers should be reinstalled, linux-docs does not matter.

Via this method, external modules (e.g. nvidia and virtualbox) don't need to be rebuilt.

Systemtap

Simply install systemtap from AUR: systemtapAUR, all done.

Build custom kernel

Please reference this README

Troubleshooting

Pass 4 fails when launching

If you have:

   /usr/share/systemtap/runtime/stat.c:214:2: error: 'cpu_possible_map' undeclared (first use in this function)

Try to install systemtap-git package

System.tap 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