1 /* $OpenBSD: cpu.c,v 1.11 2021/10/25 19:54:29 kn Exp $ */ 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/signal.h> 50 #include <sys/sched.h> 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 { "Spin", 10, 20, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0 }, 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) 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) 83 84 /* Define views */ 85 field_def *view_cpu_0[] = { 86 FLD_CPU_CPU, FLD_CPU_USR, FLD_CPU_NIC, FLD_CPU_SYS, FLD_CPU_SPIN, 87 FLD_CPU_INT, FLD_CPU_IDLE, NULL 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 struct cpustats *cpu_diff, *cpu_old, *cpu_tm; 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 cpustats_mib[] = { CTL_KERN, KERN_CPUSTATS, 0 }, i; 150 int64_t *tmpstate; 151 size_t size; 152 153 size = sizeof(*cpu_tm); 154 for (i = 0; i < cpu_count; i++) { 155 cpustats_mib[2] = i; 156 tmpstate = cpu_states + (CPUSTATES * i); 157 if (sysctl(cpustats_mib, 3, &cpu_tm[i], &size, NULL, 0) == -1) 158 error("sysctl KERN_CPUSTATS"); 159 percentages(CPUSTATES, tmpstate, cpu_tm[i].cs_time, 160 cpu_old[i].cs_time, cpu_diff[i].cs_time); 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]; 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(*cpu_tm))) == NULL || 205 (cpu_old = calloc(cpu_count, sizeof(*cpu_old))) == NULL || 206 (cpu_diff = calloc(cpu_count, sizeof(*cpu_diff))) == NULL) 207 return (-1); 208 209 for (v = views_cpu; v->name != NULL; v++) 210 add_view(v); 211 212 read_cpu(); 213 214 return(1); 215 } 216 217 #define ADD_EMPTY_LINE \ 218 do { \ 219 if (cur >= dispstart && cur < end) \ 220 end_line(); \ 221 if (++cur >= end) \ 222 return; \ 223 } while (0) 224 225 #define ADD_LINE_CPU(v, _cs) do { \ 226 if (cur >= dispstart && cur < end) { \ 227 print_fld_size(FLD_CPU_CPU, (v)); \ 228 if (cpu_tm[v].cs_flags & CPUSTATS_ONLINE) { \ 229 print_fld_percentage(FLD_CPU_USR, _cs[CP_USER]);\ 230 print_fld_percentage(FLD_CPU_NIC, _cs[CP_NICE]);\ 231 print_fld_percentage(FLD_CPU_SYS, _cs[CP_SYS]); \ 232 print_fld_percentage(FLD_CPU_SPIN, _cs[CP_SPIN]);\ 233 print_fld_percentage(FLD_CPU_INT, _cs[CP_INTR]);\ 234 print_fld_percentage(FLD_CPU_IDLE, _cs[CP_IDLE]);\ 235 } else { \ 236 print_fld_str(FLD_CPU_USR, "-"); \ 237 print_fld_str(FLD_CPU_NIC, "-"); \ 238 print_fld_str(FLD_CPU_SYS, "-"); \ 239 print_fld_str(FLD_CPU_SPIN, "-"); \ 240 print_fld_str(FLD_CPU_INT, "-"); \ 241 print_fld_str(FLD_CPU_IDLE, "-"); \ 242 } \ 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 } 271