systemtap bpf время выполнения (systemtap bpf runtime)
Имя (Name)
stapbpf - systemtap bpf runtime
Синопсис (Synopsis)
stapbpf [ OPTIONS ] MODULE
Описание (Description)
The stapbpf program is the BPF back-end of the Systemtap tool.
It expects a bpf-elf file produced by the front-end stap tool,
when run with --runtime=bpf.
Splitting the systemtap tool into a front-end and a back-end
allows a user to compile a systemtap script on a development
machine that has the debugging information needed to compile the
script and then transfer the resulting shared object to a
production machine that doesn't have any development tools or
debugging information installed.
Please refer to stappaths(7) for the version number, or run
$ rpm -q systemtap # (for Fedora/RHEL)
$ apt-get -v systemtap # (for Ubuntu)
Параметры (Options)
The stapbpf program supports the following options. Any other
option prints a list of supported options.
-v Verbose mode.
-V Print version number and exit.
-w Suppress warnings from the script.
-h Print help message.
-x PID The '_stp_target' variable will be set to PID.
-o FILE
Send output to FILE.
Аргументы (Arguments)
MODULE is the path of a bpf-elf file produced by the front-end
stap tool, when run with --runtime=bpf.
Примеры (Examples)
Here is a very basic example of how to generate a stapbpf module.
First, use stap to compile a script. The stap program will
report the name of the resulting module in the current working
directory.
$ stap --runtime=bpf -p4 -e 'probe begin { printf("Hello
World!\n"); exit() }'
stap_28784.bo
Run stapbpf with the pathname to the module as an argument.
$ stapbpf ./stap_28784.bo
Hello World!
If the -p4 option is omitted, stap will invoke stapbpf
automatically.
Ограничения (Limitations)
This runtime is in an early stage of development and it currently
lacks support for a number of features available in the default
runtime. A subset of the following probe points is supported:
begin
end
kernel.*
process.*
timer.*
perf.*
procfs.*
In general, probes based on the kprobes, uprobes, tracepoint and
perf infrastructures are supported. See stapprobes(3stap) for
more information on the probe points and which tracing
infrastructures they are based on.
for loops, foreach loops and while loops are usable only in begin
and end probes. try statements are not supported.
There is limited support for string operations. String variables
and literals are limited to 64 characters, except for printf
format strings, which are limited to 256 characters.
A subset of the statistical aggregate functionality is available,
with support only for the @count(), @sum(), @avg() extractor
functions.
The name of the bpf-elf file produced by the front-end stap tool
should not be changed.
Безопасность и защита (Safety and security)
See the stap(1) manual page for additional information on safety
and security.
Смотри также (See also)
stap(1), stapprobes(3stap), staprun(8), stapex(3stap)
Ошибки (баги) (Bugs)
Use the Bugzilla link of the project web page or our mailing
list. http://sourceware.org/systemtap/ ,
<systemtap@sourceware.org>.
