задачи профиля выполняются в реальном времени (profile tasks running live)
Описание (Description)
The trace-cmd(1) profile will start tracing just like
trace-cmd-record(1), with the --profile option, except that it
does not write to a file, but instead, it will read the events as
they happen and will update the accounting of the events. When
the trace is finished, it will report the results just like
trace-cmd-report(1) would do with its --profile option. In other
words, the profile command does the work of trace-cmd record
--profile, and trace-cmd report --profile without having to
record the data to disk, in between.
The advantage of using the profile command is that the profiling
can be done over a long period of time where recording all events
would take up too much disk space.
This will enable several events as well as the function graph
tracer with a depth of one (if the kernel supports it). This is
to show where tasks enter and exit the kernel and how long they
were in the kernel.
To disable calling function graph, use the -p option to enable
another tracer. To not enable any tracer, use -p nop.
All timings are currently in nanoseconds.
