Tracing: Difference between revisions
From KVM
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# download trace-cmd: | # download trace-cmd: | ||
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$ git clone | $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git trace-cmd | ||
$ cd trace-cmd | $ cd trace-cmd | ||
</nowiki> | </nowiki> | ||
Latest revision as of 11:58, 9 March 2011
Tracing is done by means of kernel tracepoints, the ftrace infrastructure, and trace-cmd.
Installing trace-cmd
- Install the udis86 and udis86-devel packages
- download trace-cmd:
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git trace-cmd $ cd trace-cmd
- build and install:
$ make && sudo make install
Tracing
# trace-cmd record -b 20000 -e kvm
(trace-cmd will wait)
run your workload, then stop trace-cmd with ctrl-C. trace-cmd will write a trace.dat file.
Analyzing the trace
trace-cmd report
will format and display the contents of the trace.