Documentation: tracing: Fix typos in boot-time tracing documentation

device initialization with full features of ftrace including per-event

filter and actions, histograms, kprobe-events and synthetic-events,

and trace instances.

Since kernel cmdline is not enough to control these complex features,

Since kernel command line is not enough to control these complex features,

this uses bootconfig file to describe tracing feature programming.

Options in the Boot Config

Here is the list of available options list for boot time tracing in

boot config file [1]_. All options are under "ftrace." or "kernel."

refix. See kernel parameters for the options which starts

prefix. See kernel parameters for the options which starts

with "kernel." prefix [2]_.

.. [1] See :ref:`Documentation/admin-guide/bootconfig.rst <bootconfig>`

   Add fgraph tracing function filters.

kernel.fgraph_notraces = FILTER[, FILTER2...]

   Add fgraph non tracing function filters.

   Add fgraph non-tracing function filters.

Ftrace Per-instance Options

   Set TRACER to current tracer on boot. (e.g. function)

ftrace.[instance.INSTANCE.]ftrace.filters

   This will take an array of tracing function filter rules

   This will take an array of tracing function filter rules.

ftrace.[instance.INSTANCE.]ftrace.notraces

   This will take an array of NON-tracing function filter rules

   This will take an array of NON-tracing function filter rules.

Ftrace Per-Event Options

These options are setting per-event options.

ftrace.[instance.INSTANCE.]event.GROUP.EVENT.enable

   Enables GROUP:EVENT tracing.

   Enable GROUP:EVENT tracing.

ftrace.[instance.INSTANCE.]event.GROUP.EVENT.filter = FILTER

   Set FILTER rule to the GROUP:EVENT.

        }

  }

Also, boottime tracing supports "instance" node, which allows us to run

Also, boot-time tracing supports "instance" node, which allows us to run

several tracers for different purpose at once. For example, one tracer

is for tracing functions start with "user\_", and others tracing "kernel\_"

functions, you can write boot config as below::

is for tracing functions starting with "user\_", and others tracing

"kernel\_" functions, you can write boot config as below::

  ftrace.instance {

        foo {