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Daniel Wagner reported to me that readproc.h got deprecated. Also,
while the procps-ng library was available on Fedora, it was not available
on RHEL, which is a piece of evidence that it was not that used.
rtla uses procps-ng only to find the PID of the tracers' workload.
I used the procps-ng library to avoid reinventing the wheel. But in this
case, reinventing the wheel took me less time than the time we already
took trying to work around problems.
Implement a function that reads /proc/ entries, checking if:
- the entry is a directory
- the directory name is composed only of digits (PID)
- the directory contains the comm file
- the comm file contains a comm that matches the tracers'
workload prefix.
- then return true; otherwise, return false.
And use it instead of procps-ng.
Link: https://lkml.kernel.org/r/e8276e122ee9eb2c5a0ba8e673fb6488b924b825.1652423574.git.bristot@kernel.org
Cc: John Kacur <jkacur@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tao Zhou <tao.zhou@linux.dev>
Fixes: b1696371d8 ("rtla: Helper functions for rtla")
Reported-by: Daniel Wagner <dwagner@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
34 lines
924 B
Plaintext
34 lines
924 B
Plaintext
RTLA: Real-Time Linux Analysis tools
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The rtla meta-tool includes a set of commands that aims to analyze
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the real-time properties of Linux. Instead of testing Linux as a black box,
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rtla leverages kernel tracing capabilities to provide precise information
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about the properties and root causes of unexpected results.
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Installing RTLA
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RTLA depends on the following libraries and tools:
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- libtracefs
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- libtraceevent
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It also depends on python3-docutils to compile man pages.
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For development, we suggest the following steps for compiling rtla:
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$ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git
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$ cd libtraceevent/
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$ make
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$ sudo make install
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$ cd ..
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$ git clone git://git.kernel.org/pub/scm/libs/libtrace/libtracefs.git
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$ cd libtracefs/
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$ make
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$ sudo make install
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$ cd ..
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$ cd $rtla_src
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$ make
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$ sudo make install
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For further information, please refer to the rtla man page.
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