извлечь данные из трассировщика Ftrace Linux (extract out the data from the Ftrace Linux tracer.)
Имя (Name)
trace-cmd-extract - extract out the data from the Ftrace Linux
tracer.
Синопсис (Synopsis)
trace-cmd extract [OPTIONS]
Описание (Description)
The trace-cmd(1) extract is usually used after trace-cmd-start(1)
and trace-cmd-stop(1). It can be used after the Ftrace tracer has
been started manually through the Ftrace pseudo file system.
The extract command creates a trace.dat file that can be used by
trace-cmd-report(1) to read from. It reads the kernel internal
ring buffer to produce the trace.dat file.
Параметры (Options)
-p plugin
Although extract does not start any traces, some of the
plugins require just reading the output in ASCII format.
These are the latency tracers, since the latency tracers have
a separate internal buffer. The plugin option is therefore
only necessary for the wakeup, wakeup-rt, irqsoff, preemptoff
and preemptirqsoff plugins.
With out this option, the extract command will extract from the internal
Ftrace buffers.
-O option
If a latency tracer is being extracted, and the -p option is
used, then there are some Ftrace options that can change the
format. This will update those options before extracting. To
see the list of options see trace-cmd-list. To enable an
option, write its name, to disable the option append the
characters no to it. For example: noprint-parent will disable
the print-parent option that prints the parent function in
printing a function event.
-o outputfile
By default, the extract command will create a trace.dat file.
This option will change where the file is written to.
-s
Extract from the snapshot buffer (if the kernel supports it).
--date
This is the same as the trace-cmd-record(1) --date option,
but it does cause the extract routine to disable all tracing.
That is, the end of the extract will perform something
similar to trace-cmd-reset(1).
-B buffer-name
If the kernel supports multiple buffers, this will extract
the trace for only the given buffer. It does not affect any
other buffer. This may be used multiple times to specify
different buffers. When this option is used, the top level
instance will not be extracted unless -t is given.
-a
Extract all existing buffer instances. When this option is
used, the top level instance will not be extracted unless -t
is given.
-t
Extracts the top level instance buffer. Without the -B or -a
option this is the same as the default. But if -B or -a is
used, this is required if the top level instance buffer
should also be extracted.
Смотри также (See also)
trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1),
trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-reset(1),
trace-cmd-split(1), trace-cmd-list(1), trace-cmd-listen(1)
