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[linux.git] / tools / lib / traceevent / plugins / plugin_sched_switch.c
1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3  * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <[email protected]>
4  */
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <string.h>
8
9 #include "event-parse.h"
10 #include "trace-seq.h"
11
12 static void write_state(struct trace_seq *s, int val)
13 {
14         const char states[] = "SDTtZXxW";
15         int found = 0;
16         int i;
17
18         for (i = 0; i < (sizeof(states) - 1); i++) {
19                 if (!(val & (1 << i)))
20                         continue;
21
22                 if (found)
23                         trace_seq_putc(s, '|');
24
25                 found = 1;
26                 trace_seq_putc(s, states[i]);
27         }
28
29         if (!found)
30                 trace_seq_putc(s, 'R');
31 }
32
33 static void write_and_save_comm(struct tep_format_field *field,
34                                 struct tep_record *record,
35                                 struct trace_seq *s, int pid)
36 {
37         const char *comm;
38         int len;
39
40         comm = (char *)(record->data + field->offset);
41         len = s->len;
42         trace_seq_printf(s, "%.*s",
43                          field->size, comm);
44
45         /* make sure the comm has a \0 at the end. */
46         trace_seq_terminate(s);
47         comm = &s->buffer[len];
48
49         /* Help out the comm to ids. This will handle dups */
50         tep_register_comm(field->event->tep, comm, pid);
51 }
52
53 static int sched_wakeup_handler(struct trace_seq *s,
54                                 struct tep_record *record,
55                                 struct tep_event *event, void *context)
56 {
57         struct tep_format_field *field;
58         unsigned long long val;
59
60         if (tep_get_field_val(s, event, "pid", record, &val, 1))
61                 return trace_seq_putc(s, '!');
62
63         field = tep_find_any_field(event, "comm");
64         if (field) {
65                 write_and_save_comm(field, record, s, val);
66                 trace_seq_putc(s, ':');
67         }
68         trace_seq_printf(s, "%lld", val);
69
70         if (tep_get_field_val(s, event, "prio", record, &val, 0) == 0)
71                 trace_seq_printf(s, " [%lld]", val);
72
73         if (tep_get_field_val(s, event, "success", record, &val, 1) == 0)
74                 trace_seq_printf(s, " success=%lld", val);
75
76         if (tep_get_field_val(s, event, "target_cpu", record, &val, 0) == 0)
77                 trace_seq_printf(s, " CPU:%03llu", val);
78
79         return 0;
80 }
81
82 static int sched_switch_handler(struct trace_seq *s,
83                                 struct tep_record *record,
84                                 struct tep_event *event, void *context)
85 {
86         struct tep_format_field *field;
87         unsigned long long val;
88
89         if (tep_get_field_val(s, event, "prev_pid", record, &val, 1))
90                 return trace_seq_putc(s, '!');
91
92         field = tep_find_any_field(event, "prev_comm");
93         if (field) {
94                 write_and_save_comm(field, record, s, val);
95                 trace_seq_putc(s, ':');
96         }
97         trace_seq_printf(s, "%lld ", val);
98
99         if (tep_get_field_val(s, event, "prev_prio", record, &val, 0) == 0)
100                 trace_seq_printf(s, "[%d] ", (int) val);
101
102         if (tep_get_field_val(s,  event, "prev_state", record, &val, 0) == 0)
103                 write_state(s, val);
104
105         trace_seq_puts(s, " ==> ");
106
107         if (tep_get_field_val(s, event, "next_pid", record, &val, 1))
108                 return trace_seq_putc(s, '!');
109
110         field = tep_find_any_field(event, "next_comm");
111         if (field) {
112                 write_and_save_comm(field, record, s, val);
113                 trace_seq_putc(s, ':');
114         }
115         trace_seq_printf(s, "%lld", val);
116
117         if (tep_get_field_val(s, event, "next_prio", record, &val, 0) == 0)
118                 trace_seq_printf(s, " [%d]", (int) val);
119
120         return 0;
121 }
122
123 int TEP_PLUGIN_LOADER(struct tep_handle *tep)
124 {
125         tep_register_event_handler(tep, -1, "sched", "sched_switch",
126                                    sched_switch_handler, NULL);
127
128         tep_register_event_handler(tep, -1, "sched", "sched_wakeup",
129                                    sched_wakeup_handler, NULL);
130
131         tep_register_event_handler(tep, -1, "sched", "sched_wakeup_new",
132                                    sched_wakeup_handler, NULL);
133         return 0;
134 }
135
136 void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
137 {
138         tep_unregister_event_handler(tep, -1, "sched", "sched_switch",
139                                      sched_switch_handler, NULL);
140
141         tep_unregister_event_handler(tep, -1, "sched", "sched_wakeup",
142                                      sched_wakeup_handler, NULL);
143
144         tep_unregister_event_handler(tep, -1, "sched", "sched_wakeup_new",
145                                      sched_wakeup_handler, NULL);
146 }
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