mirror of https://gitee.com/openkylin/linux.git
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If TRACE_SYSTEM is defined, that will be the directory created
|
||
|
|
* in the ftrace directory under /sys/kernel/tracing/events/<system>
|
||
|
|
*
|
||
|
|
* The define_trace.h below will also look for a file name of
|
||
|
|
* TRACE_SYSTEM.h where TRACE_SYSTEM is what is defined here.
|
||
|
|
* In this case, it would look for sample-trace.h
|
||
|
|
*
|
||
|
|
* If the header name will be different than the system name
|
||
|
|
* (as in this case), then you can override the header name that
|
||
|
|
* define_trace.h will look up by defining TRACE_INCLUDE_FILE
|
||
|
|
*
|
||
|
|
* This file is called sample-trace-array.h but we want the system
|
||
|
|
* to be called "sample-subsystem". Therefore we must define the name of this
|
||
|
|
* file:
|
||
|
|
*
|
||
|
|
* #define TRACE_INCLUDE_FILE sample-trace-array
|
||
|
|
*
|
||
|
|
* As we do in the bottom of this file.
|
||
|
|
*
|
||
|
|
* Notice that TRACE_SYSTEM should be defined outside of #if
|
||
|
|
* protection, just like TRACE_INCLUDE_FILE.
|
||
|
|
*/
|
||
|
|
#undef TRACE_SYSTEM
|
||
|
|
#define TRACE_SYSTEM sample-subsystem
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TRACE_SYSTEM is expected to be a C valid variable (alpha-numeric
|
||
|
|
* and underscore), although it may start with numbers. If for some
|
||
|
|
* reason it is not, you need to add the following lines:
|
||
|
|
*/
|
||
|
|
#undef TRACE_SYSTEM_VAR
|
||
|
|
#define TRACE_SYSTEM_VAR sample_subsystem
|
||
|
|
|
||
|
|
/*
|
||
|
|
* But the above is only needed if TRACE_SYSTEM is not alpha-numeric
|
||
|
|
* and underscored. By default, TRACE_SYSTEM_VAR will be equal to
|
||
|
|
* TRACE_SYSTEM. As TRACE_SYSTEM_VAR must be alpha-numeric, if
|
||
|
|
* TRACE_SYSTEM is not, then TRACE_SYSTEM_VAR must be defined with
|
||
|
|
* only alpha-numeric and underscores.
|
||
|
|
*
|
||
|
|
* The TRACE_SYSTEM_VAR is only used internally and not visible to
|
||
|
|
* user space.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Notice that this file is not protected like a normal header.
|
||
|
|
* We also must allow for rereading of this file. The
|
||
|
|
*
|
||
|
|
* || defined(TRACE_HEADER_MULTI_READ)
|
||
|
|
*
|
||
|
|
* serves this purpose.
|
||
|
|
*/
|
||
|
|
#if !defined(_SAMPLE_TRACE_ARRAY_H) || defined(TRACE_HEADER_MULTI_READ)
|
||
|
|
#define _SAMPLE_TRACE_ARRAY_H
|
||
|
|
|
||
|
|
#include <linux/tracepoint.h>
|
||
|
|
TRACE_EVENT(sample_event,
|
||
|
|
|
||
|
|
TP_PROTO(int count, unsigned long time),
|
||
|
|
|
||
|
|
TP_ARGS(count, time),
|
||
|
|
|
||
|
|
TP_STRUCT__entry(
|
||
|
|
__field(int, count)
|
||
|
|
__field(unsigned long, time)
|
||
|
|
),
|
||
|
|
|
||
|
|
TP_fast_assign(
|
||
|
|
__entry->count = count;
|
||
|
|
__entry->time = time;
|
||
|
|
),
|
||
|
|
|
||
|
|
TP_printk("count value=%d at jiffies=%lu", __entry->count,
|
||
|
|
__entry->time)
|
||
|
|
);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#undef TRACE_INCLUDE_PATH
|
||
|
|
#define TRACE_INCLUDE_PATH .
|
||
|
|
#define TRACE_INCLUDE_FILE sample-trace-array
|
||
|
|
#include <trace/define_trace.h>
|