Annotation of src/usr.bin/systat/cpu.c, Revision 1.3
1.3 ! miod 1: /* $OpenBSD: cpu.c,v 1.2 2013/09/11 07:01:03 mpi 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:
49: #include <sys/param.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 },
71: { "Interrupt", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
72: { "Idle", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 },
73: };
74:
75: #define FLD_CPU_CPU FIELD_ADDR(fields_cpu, 0)
76: #define FLD_CPU_INT FIELD_ADDR(fields_cpu, 1)
77: #define FLD_CPU_SYS FIELD_ADDR(fields_cpu, 2)
78: #define FLD_CPU_USR FIELD_ADDR(fields_cpu, 3)
79: #define FLD_CPU_NIC FIELD_ADDR(fields_cpu, 4)
80: #define FLD_CPU_IDLE FIELD_ADDR(fields_cpu, 5)
81:
82: /* Define views */
83: field_def *view_cpu_0[] = {
84: FLD_CPU_CPU,
1.2 mpi 85: FLD_CPU_INT, FLD_CPU_SYS, FLD_CPU_USR, FLD_CPU_NIC, FLD_CPU_IDLE, NULL
1.1 reyk 86: };
87:
88: /* Define view managers */
89: struct view_manager cpu_mgr = {
90: "cpu", select_cpu, read_cpu, NULL, print_header,
91: print_cpu, keyboard_callback, NULL, NULL
92: };
93:
94: field_view views_cpu[] = {
95: { view_cpu_0, "cpu", 'C', &cpu_mgr },
96: { NULL, NULL, 0, NULL }
97: };
98:
99: int cpu_count;
100: int64_t *cpu_states;
101: int64_t **cpu_tm;
102: int64_t **cpu_old;
103: int64_t **cpu_diff;
104:
105: /*
106: * percentages(cnt, out, new, old, diffs) - calculate percentage change
107: * between array "old" and "new", putting the percentages in "out".
108: * "cnt" is size of each array and "diffs" is used for scratch space.
109: * The array "old" is updated on each call.
110: * The routine assumes modulo arithmetic. This function is especially
111: * useful on BSD machines for calculating cpu state percentages.
112: */
113: static int
114: percentages(int cnt, int64_t *out, int64_t *new, int64_t *old, int64_t *diffs)
115: {
116: int64_t change, total_change, *dp, half_total;
117: int i;
118:
119: /* initialization */
120: total_change = 0;
121: dp = diffs;
122:
123: /* calculate changes for each state and the overall change */
124: for (i = 0; i < cnt; i++) {
125: if ((change = *new - *old) < 0) {
126: /* this only happens when the counter wraps */
127: change = INT64_MAX - *old + *new;
128: }
129: total_change += (*dp++ = change);
130: *old++ = *new++;
131: }
132:
133: /* avoid divide by zero potential */
134: if (total_change == 0)
135: total_change = 1;
136:
137: /* calculate percentages based on overall change, rounding up */
138: half_total = total_change / 2l;
139: for (i = 0; i < cnt; i++)
140: *out++ = ((*diffs++ * 1000 + half_total) / total_change);
141:
142: /* return the total in case the caller wants to use it */
143: return (total_change);
144: }
145:
146: static void
147: cpu_info(void)
148: {
149: int cpu_time_mib[] = { CTL_KERN, KERN_CPTIME2, 0 }, i;
150: int64_t *tmpstate;
151: size_t size;
152:
153: size = CPUSTATES * sizeof(int64_t);
154: for (i = 0; i < cpu_count; i++) {
155: cpu_time_mib[2] = i;
156: tmpstate = cpu_states + (CPUSTATES * i);
157: if (sysctl(cpu_time_mib, 3, cpu_tm[i], &size, NULL, 0) < 0)
158: error("sysctl KERN_CPTIME2");
159: percentages(CPUSTATES, tmpstate, cpu_tm[i],
160: cpu_old[i], cpu_diff[i]);
161: }
162: }
163:
164: static void
165: print_fld_percentage(field_def *fld, double val)
166: {
167: if (fld == NULL)
168: return;
169:
170: tb_start();
171: tbprintf(val >= 1000 ? "%4.0f%%" : "%4.1f%%", val / 10.);
172: print_fld_tb(fld);
173: tb_end();
174: }
175:
176: int
177: select_cpu(void)
178: {
179: return (0);
180: }
181:
182: int
183: read_cpu(void)
184: {
185: cpu_info();
186: num_disp = cpu_count;
187: return (0);
188: }
189:
190: int
191: initcpu(void)
192: {
193: field_view *v;
194: size_t size = sizeof(cpu_count);
195: int mib[2], i;
196:
197: mib[0] = CTL_HW;
198: mib[1] = HW_NCPU;
199: if (sysctl(mib, 2, &cpu_count, &size, NULL, 0) == -1)
200: return (-1);
201: if ((cpu_states = calloc(cpu_count,
202: CPUSTATES * sizeof(int64_t))) == NULL)
203: return (-1);
204: if ((cpu_tm = calloc(cpu_count, sizeof(int64_t *))) == NULL ||
205: (cpu_old = calloc(cpu_count, sizeof(int64_t *))) == NULL ||
206: (cpu_diff = calloc(cpu_count, sizeof(int64_t *))) == NULL)
207: return (-1);
208: for (i = 0; i < cpu_count; i++) {
209: if ((cpu_tm[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL ||
210: (cpu_old[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL ||
211: (cpu_diff[i] = calloc(CPUSTATES, sizeof(int64_t))) == NULL)
212: return (-1);
213: }
214:
215: for (v = views_cpu; v->name != NULL; v++)
216: add_view(v);
217:
218: read_cpu();
219:
220: return(1);
221: }
222:
223: #define ADD_EMPTY_LINE \
224: do { \
225: if (cur >= dispstart && cur < end) \
226: end_line(); \
227: if (++cur >= end) \
228: return; \
229: } while (0)
230:
231: #define ADD_LINE_CPU(v, cs) \
232: do { \
233: if (cur >= dispstart && cur < end) { \
234: print_fld_size(FLD_CPU_CPU, (v)); \
235: print_fld_percentage(FLD_CPU_INT, (cs[0])); \
236: print_fld_percentage(FLD_CPU_SYS, (cs[1])); \
237: print_fld_percentage(FLD_CPU_USR, (cs[2])); \
238: print_fld_percentage(FLD_CPU_NIC, (cs[3])); \
239: print_fld_percentage(FLD_CPU_IDLE, (cs[4])); \
240: end_line(); \
241: } \
242: if (++cur >= end) \
243: return; \
244: } while (0)
245:
246: void
247: print_cpu(void)
248: {
249: time_t tm;
250: int cur = 0, c, i;
251: int end = dispstart + maxprint;
252: int64_t *states;
253: double value[CPUSTATES];
254: tm = time(NULL);
255:
256: if (end > num_disp)
257: end = num_disp;
258:
259: for (c = 0; c < cpu_count; c++) {
260: states = cpu_states + (CPUSTATES * c);
261:
262: for (i = 0; i < CPUSTATES; i++)
263: value[i] = *states++;
264:
265: ADD_LINE_CPU(c, value);
266: }
267:
268: ADD_EMPTY_LINE;
269: }
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