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84 lines
2.4 KiB
84 lines
2.4 KiB
/* 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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