mirror of https://gitee.com/openkylin/linux.git
56 lines
1.5 KiB
ReStructuredText
56 lines
1.5 KiB
ReStructuredText
===============================
|
|
The Linux Kernel Tracepoint API
|
|
===============================
|
|
|
|
:Author: Jason Baron
|
|
:Author: William Cohen
|
|
|
|
Introduction
|
|
============
|
|
|
|
Tracepoints are static probe points that are located in strategic points
|
|
throughout the kernel. 'Probes' register/unregister with tracepoints via
|
|
a callback mechanism. The 'probes' are strictly typed functions that are
|
|
passed a unique set of parameters defined by each tracepoint.
|
|
|
|
From this simple callback mechanism, 'probes' can be used to profile,
|
|
debug, and understand kernel behavior. There are a number of tools that
|
|
provide a framework for using 'probes'. These tools include Systemtap,
|
|
ftrace, and LTTng.
|
|
|
|
Tracepoints are defined in a number of header files via various macros.
|
|
Thus, the purpose of this document is to provide a clear accounting of
|
|
the available tracepoints. The intention is to understand not only what
|
|
tracepoints are available but also to understand where future
|
|
tracepoints might be added.
|
|
|
|
The API presented has functions of the form:
|
|
``trace_tracepointname(function parameters)``. These are the tracepoints
|
|
callbacks that are found throughout the code. Registering and
|
|
unregistering probes with these callback sites is covered in the
|
|
``Documentation/trace/*`` directory.
|
|
|
|
IRQ
|
|
===
|
|
|
|
.. kernel-doc:: include/trace/events/irq.h
|
|
:internal:
|
|
|
|
SIGNAL
|
|
======
|
|
|
|
.. kernel-doc:: include/trace/events/signal.h
|
|
:internal:
|
|
|
|
Block IO
|
|
========
|
|
|
|
.. kernel-doc:: include/trace/events/block.h
|
|
:internal:
|
|
|
|
Workqueue
|
|
=========
|
|
|
|
.. kernel-doc:: include/trace/events/workqueue.h
|
|
:internal:
|