TRACE\-CMD\-EXTRACT

Section: [FIXME: manual] (1)
Updated: 06/22/2012
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NAME

trace-cmd-extract - extract out the data from the Ftrace Linux tracer.

SYNOPSIS

trace-cmd extract [OPTIONS]

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.

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