The trace-cmd(1) hist displays a histogram form from the trace.dat
file. Instead of showing the events as they were ordered, it creates
a histogram that can be displayed per task or for all tasks where the
most common events appear first. It uses the function tracer and call
stacks that it finds to try to put together a call graph of the
By default, trace-cmd hist will read the file trace.dat. But the
-i option open up the given input-file instead. Note, the input
file may also be specified as the last item on the command line.
To compact all events and show the call graphs by ignoring tasks
and different PIDs, add the -P to do so. Instead of showing the
task name, it will group all chains together and show "<all
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