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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
|
#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>
#include <sys/param.h>
#include <sys/cpuset.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <sched.h>
#include <stdio.h>
=pod
Manipulate CPU affinity of FreeBSD processes with
cpuset_getaffinity() and cpuset_setaffinity()
system calls.
=cut
int num_cpus_sysctl()
{
int mib[2], ncpu;
size_t len;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
len = sizeof(ncpu);
sysctl(mib, 2, &ncpu, &len, NULL, 0);
return ncpu;
}
int getaffinity_freebsd(int pid, AV *mask, int debug)
{
cpulevel_t level = CPU_LEVEL_WHICH;
cpuwhich_t which = CPU_WHICH_PID;
id_t id = (id_t) pid;
size_t setsize;
cpuset_t cpumask;
int i, r;
setsize = sizeof(cpumask);
if (debug) {
fprintf(stderr,"calling cpuset_getaffinity(%d,%d,%d,%d,&cpumask)\n",
(int) level, (int) which, (int) id, (int) setsize);
}
r = cpuset_getaffinity(level, which, id, setsize, &cpumask);
if (debug) {
fprintf(stderr,"cpuset_getaffinity return value: %d\n", r);
}
if (r != 0) {
if (errno == EINVAL) {
fprintf(stderr, "cpuset_getaffinity: invalid level or which arg\n");
} else if (errno == EDEADLK) {
fprintf(stderr, "cpuset_getaffinity: EDEADLK encountered\n");
} else if (errno == EFAULT) {
fprintf(stderr, "cpuset_getaffinity: EFAULT - invalid cpu mask\n");
} else if (errno == ESRCH) {
fprintf(stderr, "cpuset_getaffinity: ESRCH - invalid pid\n");
} else if (errno == ERANGE) {
fprintf(stderr, "cpuset_getaffinity: ERANGE - invalid cpusetsize\n");
} else if (errno == EPERM) {
fprintf(stderr, "cpuset_getaffinity: EPERM - "
"no permission to get affinity for pid=%d\n", pid);
} else {
fprintf(stderr, "cpuset_getaffinity: unknown error %d\n", errno);
}
return 0;
} else {
int ncpu = num_cpus_sysctl();
int nset = 0;
if (debug) {
fprintf(stderr,"num_cpus_sysctl() returned: %d\n", ncpu);
}
if (ncpu <= 0) {
fprintf(stderr, "getaffinity_freebsd: "
"failed to get num cpus from sysctl\n");
ncpu = 32;
}
for (i = 0; i < ncpu; i++) {
if (CPU_ISSET(i, &cpumask)) {
nset++;
av_push(mask, newSViv(i));
if (debug) {
fprintf(stderr,"cpu #%d is set\n", i);
}
} else if (debug) {
fprintf(stderr,"cpu #%d is clear\n", i);
}
}
if (nset == 0) {
fprintf(stderr, "getaffinity_freebsd: no cpu set in cpumask\n");
for (i = 0; i < ncpu; i++) {
av_push(mask, newSViv(i));
}
}
return 1;
}
}
int setaffinity_freebsd(int pid, AV *mask)
{
cpulevel_t level = CPU_LEVEL_WHICH;
cpuwhich_t which = CPU_WHICH_PID;
id_t id = (id_t) pid;
size_t setsize;
cpuset_t cpumask;
int i, r;
int n = av_len(mask) + 1;
int ncpu = num_cpus_sysctl();
CPU_ZERO(&cpumask);
if (ncpu > 0 && n > ncpu) {
fprintf(stderr, "setaffinity_freebsd: "
"mask is larger than the number of cpus!\n");
}
setsize = sizeof(cpumask);
for (i = 0; i < n; i++) {
int proc_id = SvIV(*av_fetch(mask, i, 0));
if (ncpu <= 0 || proc_id < ncpu) {
CPU_SET(proc_id, &cpumask);
} else {
fprintf(stderr, "setaffinity_freebsd: ignoring request to set "
"processor %d which exceeds known num cpus %d\n",
proc_id, ncpu);
}
}
r = cpuset_setaffinity(level, which, id, setsize, &cpumask);
if (r != 0) {
if (errno == EINVAL) {
fprintf(stderr, "cpuset_setaffinity: EINVAL - "
"bad level, which, or mask arg\n");
} else if (errno == EDEADLK) {
fprintf(stderr, "cpuset_setaffinity: EDEADLK found\n");
} else if (errno == EFAULT) {
fprintf(stderr, "cpuset_setaffinity: EFAULT - invalid mask pointer\n");
} else if (errno == ESRCH) {
fprintf(stderr, "cpuset_setaffinity: ESRCH - invalid pid\n");
} else if (errno == ERANGE) {
fprintf(stderr, "cpuset_setaffinity: ERANGE - bad cpusetsize\n");
} else if (errno == EPERM) {
fprintf(stderr, "cpuset_setaffinity: EPERM - "
"no permission to set affinity on pid=%d\n", pid);
} else {
fprintf(stderr, "cpuset_setaffinity: unexpected error no=%d\n", errno);
}
return 0;
} else {
return 1;
}
}
MODULE = Sys::CpuAffinity PACKAGE = Sys::CpuAffinity
int
xs_getaffinity_freebsd(pid,mask,debug)
int pid
AV *mask
int debug
CODE:
RETVAL = getaffinity_freebsd(pid,mask,debug);
OUTPUT:
RETVAL
int
xs_setaffinity_freebsd(pid,mask)
int pid
AV *mask
CODE:
RETVAL = setaffinity_freebsd(pid,mask);
OUTPUT:
RETVAL
int
xs_num_cpus_freebsd()
CODE:
RETVAL = num_cpus_sysctl();
OUTPUT:
RETVAL
|
