Annotation of src/usr.bin/systat/cpu.c, Revision 1.6
1.6 ! mpi 1: /* $OpenBSD: cpu.c,v 1.5 2016/01/02 20:02:40 benno Exp $ */
1.1 reyk 2:
3: /*
4: * Copyright (c) 2013 Reyk Floeter <reyk@openbsd.org>
5: * Copyright (c) 2001, 2007 Can Erkin Acar <canacar@openbsd.org>
6: *
7: * Permission to use, copy, modify, and distribute this software for any
8: * purpose with or without fee is hereby granted, provided that the above
9: * copyright notice and this permission notice appear in all copies.
10: *
11: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18: */
19:
20: /* CPU percentages() function from usr.bin/top/util.c:
21: *
22: * Top users/processes display for Unix
23: * Version 3
24: *
25: * Copyright (c) 1984, 1989, William LeFebvre, Rice University
26: * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
27: *
28: * Redistribution and use in source and binary forms, with or without
29: * modification, are permitted provided that the following conditions
30: * are met:
31: * 1. Redistributions of source code must retain the above copyright
32: * notice, this list of conditions and the following disclaimer.
33: * 2. Redistributions in binary form must reproduce the above copyright
34: * notice, this list of conditions and the following disclaimer in the
35: * documentation and/or other materials provided with the distribution.
36: *
37: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
38: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
40: * IN NO EVENT SHALL THE AUTHOR OR HIS EMPLOYER BE LIABLE FOR ANY DIRECT, INDIRECT,
41: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
43: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
44: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
45: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
46: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47: */
48:
1.4 deraadt 49: #include <sys/signal.h>
1.3 miod 50: #include <sys/sched.h>
1.1 reyk 51: #include <sys/sysctl.h>
52:
53: #include <stdlib.h>
54: #include <stdint.h>
55: #include <string.h>
56: #include <unistd.h>
57: #include "systat.h"
58:
59: void print_cpu(void);
60: int read_cpu(void);
61: int select_cpu(void);
62: static void cpu_info(void);
63: static void print_fld_percentage(field_def *, double);
64: static int percentages(int, int64_t *, int64_t *, int64_t *, int64_t *);
65:
66: field_def fields_cpu[] = {
67: { "CPU", 4, 8, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0 },
68: { "User", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
69: { "Nice", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
70: { "System", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
1.6 ! mpi 71: { "Spin", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
1.1 reyk 72: { "Interrupt", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
73: { "Idle", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
74: };
75:
76: #define FLD_CPU_CPU FIELD_ADDR(fields_cpu, 0)
1.6 ! mpi 77: #define FLD_CPU_USR FIELD_ADDR(fields_cpu, 1)
! 78: #define FLD_CPU_NIC FIELD_ADDR(fields_cpu, 2)
! 79: #define FLD_CPU_SYS FIELD_ADDR(fields_cpu, 3)
! 80: #define FLD_CPU_SPIN FIELD_ADDR(fields_cpu, 4)
! 81: #define FLD_CPU_INT FIELD_ADDR(fields_cpu, 5)
! 82: #define FLD_CPU_IDLE FIELD_ADDR(fields_cpu, 6)
1.1 reyk 83:
84: /* Define views */
85: field_def *view_cpu_0[] = {
1.6 ! mpi 86: FLD_CPU_CPU, FLD_CPU_USR, FLD_CPU_NIC, FLD_CPU_SYS, FLD_CPU_SPIN,
! 87: FLD_CPU_INT, FLD_CPU_IDLE, NULL
1.1 reyk 88: };
89:
90: /* Define view managers */
91: struct view_manager cpu_mgr = {
92: "cpu", select_cpu, read_cpu, NULL, print_header,
93: print_cpu, keyboard_callback, NULL, NULL
94: };
95:
96: field_view views_cpu[] = {
97: { view_cpu_0, "cpu", 'C', &cpu_mgr },
98: { NULL, NULL, 0, NULL }
99: };
100:
101: int cpu_count;
102: int64_t *cpu_states;
103: int64_t **cpu_tm;
104: int64_t **cpu_old;
105: int64_t **cpu_diff;
106:
107: /*
108: * percentages(cnt, out, new, old, diffs) - calculate percentage change
109: * between array "old" and "new", putting the percentages in "out".
110: * "cnt" is size of each array and "diffs" is used for scratch space.
111: * The array "old" is updated on each call.
112: * The routine assumes modulo arithmetic. This function is especially
113: * useful on BSD machines for calculating cpu state percentages.
114: */
115: static int
116: percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs)
117: {
118: int64_t change, total_change, *dp, half_total;
119: int i;
120:
121: /* initialization */
122: total_change = 0;
123: dp = diffs;
124:
125: /* calculate changes for each state and the overall change */
126: for (i = 0; i < cnt; i++) {
127: if ((change = *new - *old) < 0) {
128: /* this only happens when the counter wraps */
129: change = INT64_MAX - *old + *new;
130: }
131: total_change += (*dp++ = change);
132: *old++ = *new++;
133: }
134:
135: /* avoid divide by zero potential */
136: if (total_change == 0)
137: total_change = 1;
138:
139: /* calculate percentages based on overall change, rounding up */
140: half_total = total_change / 2l;
141: for (i = 0; i < cnt; i++)
142: *out++ = ((*diffs++ * 1000 + half_total) / total_change);
143:
144: /* return the total in case the caller wants to use it */
145: return (total_change);
146: }
147:
148: static void
149: cpu_info(void)
150: {
151: int cpu_time_mib[] = { CTL_KERN, KERN_CPTIME2, 0 }, i;
152: int64_t *tmpstate;
153: size_t size;
154:
155: size = CPUSTATES * sizeof(int64_t);
156: for (i = 0; i < cpu_count; i++) {
157: cpu_time_mib[2] = i;
158: tmpstate = cpu_states + (CPUSTATES * i);
159: if (sysctl(cpu_time_mib, 3, cpu_tm[i], &size, NULL, 0) < 0)
160: error("sysctl KERN_CPTIME2");
161: percentages(CPUSTATES, tmpstate, cpu_tm[i],
162: cpu_old[i], cpu_diff[i]);
163: }
164: }
165:
166: static void
167: print_fld_percentage(field_def *fld, double val)
168: {
169: if (fld == NULL)
170: return;
171:
172: tb_start();
173: tbprintf(val >= 1000 ? "%4.0f%%" : "%4.1f%%", val / 10.);
174: print_fld_tb(fld);
175: tb_end();
176: }
177:
178: int
179: select_cpu(void)
180: {
181: return (0);
182: }
183:
184: int
185: read_cpu(void)
186: {
187: cpu_info();
188: num_disp = cpu_count;
189: return (0);
190: }
191:
192: int
193: initcpu(void)
194: {
195: field_view *v;
196: size_t size = sizeof(cpu_count);
197: int mib[2], i;
198:
199: mib[0] = CTL_HW;
200: mib[1] = HW_NCPU;
201: if (sysctl(mib, 2, &cpu_count, &size, NULL, 0) == -1)
202: return (-1);
203: if ((cpu_states = calloc(cpu_count,
204: CPUSTATES * sizeof(int64_t))) == NULL)
205: return (-1);
206: if ((cpu_tm = calloc(cpu_count, sizeof(int64_t *))) == NULL ||
207: (cpu_old = calloc(cpu_count, sizeof(int64_t *))) == NULL ||
208: (cpu_diff = calloc(cpu_count, sizeof(int64_t *))) == NULL)
209: return (-1);
210: for (i = 0; i < cpu_count; i++) {
211: if ((cpu_tm[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL ||
212: (cpu_old[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL ||
213: (cpu_diff[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL)
214: return (-1);
215: }
216:
217: for (v = views_cpu; v->name != NULL; v++)
218: add_view(v);
219:
220: read_cpu();
221:
222: return(1);
223: }
224:
225: #define ADD_EMPTY_LINE \
226: do { \
227: if (cur >= dispstart && cur < end) \
228: end_line(); \
229: if (++cur >= end) \
230: return; \
231: } while (0)
232:
233: #define ADD_LINE_CPU(v, cs) \
234: do { \
235: if (cur >= dispstart && cur < end) { \
236: print_fld_size(FLD_CPU_CPU, (v)); \
1.6 ! mpi 237: print_fld_percentage(FLD_CPU_USR, (cs[CP_USER]));\
! 238: print_fld_percentage(FLD_CPU_NIC, (cs[CP_NICE]));\
! 239: print_fld_percentage(FLD_CPU_SYS, (cs[CP_SYS]));\
! 240: print_fld_percentage(FLD_CPU_SPIN, (cs[CP_SPIN]));\
! 241: print_fld_percentage(FLD_CPU_INT, (cs[CP_INTR]));\
! 242: print_fld_percentage(FLD_CPU_IDLE, (cs[CP_IDLE])); \
1.1 reyk 243: end_line(); \
244: } \
245: if (++cur >= end) \
246: return; \
247: } while (0)
248:
249: void
250: print_cpu(void)
251: {
252: int cur = 0, c, i;
253: int end = dispstart + maxprint;
254: int64_t *states;
255: double value[CPUSTATES];
256:
257: if (end > num_disp)
258: end = num_disp;
259:
260: for (c = 0; c < cpu_count; c++) {
261: states = cpu_states + (CPUSTATES * c);
262:
263: for (i = 0; i < CPUSTATES; i++)
264: value[i] = *states++;
265:
266: ADD_LINE_CPU(c, value);
267: }
268:
269: ADD_EMPTY_LINE;
270: }
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