[Crash-utility] Re: [RFC] Crash extension for SystemTap

[Satoru MORIYA]

Hi,

Sorry, I forgot to attach my source code.
Here is the source code.

Satoru MORIYA wrote:

> Hi,
> 
> Here is an extension(shared object) of the crash to retrieve the trace
> data of systemtap scripts.
> 
> I'd like to analyze what caused the kernel panic by using the systemtap.
> However, currently the systemtap's trace data can't be retrieved from a
> dumped image easily. So, I developed a crash's extension which retrieves
> the data recorded by systemtap from the dumped image.
> Here is a brief document of this extension. This extension supports the new
> utt-based buffer as well as the bulk-mode buffer of old systemtap module.
> 
> I have tested this extention on the following system.
>   * FC6, i386, kernel-2.6.21, systemtap-0.5.14, crash-4.0-1.1
>   * FC6, i386, kernel-2.6.20, systemtap-0.5.13/14, crash-4.0-1.1
>   * RHEL5, i386, kernel-2.6.18-8.el5, systemtap-0.5.12, crash-4.0-3.14
> 
> 
> Preparation
> ==============
> (A) Build the shared-object(stplog.so).
> 
> 1. Put Makefile and stplog.c into a directory ($DIR)
>     $ cd $DIR
> 
> 2. Make the symbolic link to the crash source code directory
>     $ ln -s $WHERE_CRASH_PLACED crash
> 
> 3. Build
>     $ make
> 
> (B) Make the crash dump which includes SystemTap trace data.
>     (*)If you analyze the live system memory, ignore this section.
> 
> 1. Install kdump
>      If you use FC6, see following URL.
>      http://fedoraproject.org/wiki/FC6KdumpKexecHowTo?highlight=%28kdump%29
> 
> 2. Use SystemTap
>     $ stap foo.stp
> 
> 3. Panic
>     $ echo c > /proc/sysrq-trigger
> 
> How to use
> ==============
> 1. start crash
>     $ crash vmlinux vmcore
>     (*) If you analyze the live system memory, you don't need "vmcore".
>          $ crash vmlinux
> 
> 2. load the shared-object
>     crash> extend $(WHERE_OBJ_PLACED)/stplog.so
> 
> 3. retrieve the data
>     crash> stplog -m <mod_name>
>     (*) <mod_name> is the name of trace module from which you retrieve data.
> 
> 4. You can get output files under the directory whose name is <mod_name>.
> 
> Output
> ==============
> stplog command makes a file per channel buffer of relayfs(equivalent to per cpu).
> And it also removes padding bytes.
> 
> 
> I believe this command is very useful for system administrators
> if they monitor their systems with SystemTap.
> 
> Best Regards,
> 
> ---
> Satoru MORIYA
> Linux Technology Center
> Hitachi, Ltd., Systems Development Laboratory
> E-mail: satoru.moriya.br at hitachi.com
> 
> 
> 

-- 
---
Satoru MORIYA
Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: satoru.moriya.br at hitachi.com
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