Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/samples/trace_events/trace_custom_sched.h
26285 views
1
/* SPDX-License-Identifier: GPL-2.0 */

2


3
/*

4
 * Like the headers that use TRACE_EVENT(), the TRACE_CUSTOM_EVENT()

5
 * needs a header that allows for multiple inclusions.

6
 *

7
 * Test for a unique name (here we have _TRACE_CUSTOM_SCHED_H),

8
 * also allowing to continue if TRACE_CUSTOM_MULTI_READ is defined.

9
 */

10
#if !defined(_TRACE_CUSTOM_SCHED_H) || defined(TRACE_CUSTOM_MULTI_READ)

11
#define _TRACE_CUSTOM_SCHED_H

12


13
/* Include linux/trace_events.h for initial defines of TRACE_CUSTOM_EVENT() */

14
#include <linux/trace_events.h>

15


16
/*

17
 * TRACE_CUSTOM_EVENT() is just like TRACE_EVENT(). The first parameter

18
 * is the event name of an existing event where the TRACE_EVENT has been included

19
 * in the C file before including this file.

20
 */

21
TRACE_CUSTOM_EVENT(sched_switch,

22


23
	/*

24
	 * The TP_PROTO() and TP_ARGS must match the trace event

25
	 * that the custom event is using.

26
	 */

27
	TP_PROTO(bool preempt,

28
		 struct task_struct *prev,

29
		 struct task_struct *next,

30
		 unsigned int prev_state),

31


32
	TP_ARGS(preempt, prev, next, prev_state),

33


34
	/*

35
	 * The next fields are where the customization happens.

36
	 * The TP_STRUCT__entry() defines what will be recorded

37
	 * in the ring buffer when the custom event triggers.

38
	 *

39
	 * The rest is just like the TRACE_EVENT() macro except that

40
	 * it uses the custom entry.

41
	 */

42
	TP_STRUCT__entry(

43
		__field(	unsigned short,		prev_prio	)

44
		__field(	unsigned short,		next_prio	)

45
		__field(	pid_t,	next_pid			)

46
	),

47


48
	TP_fast_assign(

49
		__entry->prev_prio	= prev->prio;

50
		__entry->next_pid	= next->pid;

51
		__entry->next_prio	= next->prio;

52
	),

53


54
	TP_printk("prev_prio=%d next_pid=%d next_prio=%d",

55
		  __entry->prev_prio, __entry->next_pid, __entry->next_prio)

56
)

57


58


59
TRACE_CUSTOM_EVENT(sched_waking,

60


61
	TP_PROTO(struct task_struct *p),

62


63
	TP_ARGS(p),

64


65
	TP_STRUCT__entry(

66
		__field(	pid_t,			pid	)

67
		__field(	unsigned short,		prio	)

68
	),

69


70
	TP_fast_assign(

71
		__entry->pid	= p->pid;

72
		__entry->prio	= p->prio;

73
	),

74


75
	TP_printk("pid=%d prio=%d", __entry->pid, __entry->prio)

76
)

77
#endif

78
/*

79
 * Just like the headers that create TRACE_EVENTs, the below must

80
 * be outside the protection of the above #if block.

81
 */

82


83
/*

84
 * It is required that the Makefile includes:

85
 *    CFLAGS_<c_file>.o := -I$(src)

86
 */

87
#undef TRACE_INCLUDE_PATH

88
#undef TRACE_INCLUDE_FILE

89
#define TRACE_INCLUDE_PATH .

90


91
/*

92
 * It is requred that the TRACE_INCLUDE_FILE be the same

93
 * as this file without the ".h".

94
 */

95
#define TRACE_INCLUDE_FILE trace_custom_sched

96
#include <trace/define_custom_trace.h>

97


98