1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
#! /usr/bin/env stap
############################################################
# Schedtimes.stp
# Author: Jason Baron <jbaron@redhat.com>
# profiles threads and displays their run times, queued times,
# wait times, including i/o wait times.
# Has two modes. When no arguments are given it profiles all
# threads. Alternatively, you can pass -c "program name"
############################################################
//constants
global RUNNING=0, QUEUED=1, SLEEPING=2
global traced_pid
global run_time, queued_time, sleep_time, io_wait_time
global pid_state, pid_names
global previous_timestamp
global io_wait_count
global io_wait_incremented
function get_iowait:long(queue:long)
{
return @cast(queue,"rq","kernel")->nr_iowait->counter;
}
probe kernel.trace("sched_switch") {
previous_pid = $prev->pid;
next_pid = $next->pid;
if (traced_pid) {
if (previous_pid != traced_pid) {
previous_pid = 0;
}
if (next_pid != traced_pid) {
next_pid = 0;
}
}
if (previous_pid) {
if (!([previous_pid] in pid_state)) {
//use this state as entry into state machine
previous_timestamp[previous_pid] = gettimeofday_us();
pid_names[previous_pid] = kernel_string($prev->comm);
if ($prev->state > 0) {
pid_state[previous_pid] = SLEEPING;
} else if ($prev->state == 0) {
pid_state[previous_pid] = QUEUED;
} else {
printf("unknown transition:\n");
printf("pid state: %d our state: %d\n",
$prev->state, pid_state[previous_pid]);
}
} else if (pid_state[previous_pid] == RUNNING) {
pid_names[previous_pid] = kernel_string($prev->comm);
t = gettimeofday_us();
run_time[previous_pid] += (t - previous_timestamp[previous_pid]);
previous_timestamp[previous_pid] = t;
if ($prev->state > 0) {
if ((get_iowait($rq) - io_wait_count[previous_pid]) > 0)
io_wait_incremented[previous_pid] = 1;
pid_state[previous_pid] = SLEEPING;
} else if ($prev->state == 0) {
pid_state[previous_pid] = QUEUED;
} else {
printf("unknown transition:\n");
printf("pid state: %d our state: %d\n",
$prev->state, pid_state[previous_pid]);
}
} else {
printf("unknown transition:\n");
printf("%s pid state: %d our state: %d\n",
pid_names[previous_pid],
$prev->state, pid_state[previous_pid]);
}
}
if (next_pid) {
io_wait_count[next_pid] = get_iowait($rq);
if (!([next_pid] in pid_state)) {
//use this state as entry into state machine
previous_timestamp[next_pid] = gettimeofday_us();
pid_state[next_pid] = RUNNING;
pid_names[next_pid] = kernel_string($next->comm);
} else if (pid_state[next_pid] == QUEUED) {
t = gettimeofday_us();
queued_time[next_pid] += (t - previous_timestamp[next_pid]);
previous_timestamp[next_pid] = t;
pid_state[next_pid] = RUNNING;
pid_names[next_pid] = kernel_string($next->comm);
} else {
printf("unknown transition:\n");
printf("%s pid state: %d our state: %d\n",
pid_names[next_pid],
$next->state, pid_state[next_pid]);
}
}
}
probe kernel.trace("sched_wakeup") {
wakeup_pid = $p->pid;
if (traced_pid && (wakeup_pid != traced_pid)) next
if ((!$success) && (pid_state[wakeup_pid] != SLEEPING)) next
if (!wakeup_pid) next
if (!([wakeup_pid] in pid_state)) {
//use this state as entry into state machine
previous_timestamp[wakeup_pid] = gettimeofday_us();
pid_state[wakeup_pid] = QUEUED;
pid_names[wakeup_pid] = kernel_string($p->comm);
} else if (pid_state[wakeup_pid] == SLEEPING) {
t = gettimeofday_us();
sleep_time[wakeup_pid] += (t - previous_timestamp[wakeup_pid]);
if (io_wait_incremented[wakeup_pid] == 1) {
io_wait_time[wakeup_pid] += (t - previous_timestamp[wakeup_pid]);
io_wait_incremented[wakeup_pid] = 0;
}
previous_timestamp[wakeup_pid] = t;
pid_state[wakeup_pid] = QUEUED;
pid_names[wakeup_pid] = kernel_string($p->comm);
} else {
printf("unknown transition:\n");
printf("pid state: %d our state: %d\n",
$p->state, pid_state[wakeup_pid]);
}
}
probe begin {
traced_pid = target();
if (traced_pid == 0) {
printf("all mode\n");
} else {
printf("target mode\n");
printf("traced pid: %d\n", traced_pid);
}
}
probe end {
t = gettimeofday_us();
foreach (pid in pid_state) {
if (pid_state[pid] == SLEEPING)
sleep_time[pid] += (t - previous_timestamp[pid]);
if (pid_state[pid] == QUEUED)
queued_time[pid] += (t - previous_timestamp[pid]);
if (pid_state[pid] == RUNNING)
run_time[pid] += (t - previous_timestamp[pid]);
}
printf ("%16s: %6s %10s %10s %10s %10s %10s\n\n",
"execname", "pid", "run(us)", "sleep(us)", "io_wait(us)",
"queued(us)", "total(us)")
foreach (pid+ in run_time) {
printf("%16s: %6d %10d %10d %10d %10d %10d\n",
pid_names[pid], pid, run_time[pid], sleep_time[pid],
io_wait_time[pid], queued_time[pid],
(run_time[pid] + sleep_time[pid] + queued_time[pid]));
}
}
|
