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