kern_history.c revision 1.1.36.1
1 /* $NetBSD: kern_history.c,v 1.1.36.1 2015/12/27 12:10:05 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * from: NetBSD: uvm_stat.c,v 1.36 2011/02/02 15:13:34 chuck Exp 28 * from: Id: uvm_stat.c,v 1.1.2.3 1997/12/19 15:01:00 mrg Exp 29 */ 30 31 /* 32 * subr_kernhist.c 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: kern_history.c,v 1.1.36.1 2015/12/27 12:10:05 skrll Exp $"); 37 38 #include "opt_kernhist.h" 39 #include "opt_ddb.h" 40 #include "opt_uvmhist.h" 41 #include "opt_usb.h" 42 #include "opt_syscall_debug.h" 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/cpu.h> 47 #include <sys/kernhist.h> 48 49 #include "usb.h" 50 #if NUSB == 0 51 #undef USB_DEBUG 52 #endif 53 54 #ifdef UVMHIST 55 #include <uvm/uvm.h> 56 #endif 57 58 #ifdef USB_DEBUG 59 #include <dev/usb/usbhist.h> 60 #endif 61 62 #ifdef SYSCALL_DEBUG 63 KERNHIST_DECL(scdebughist); 64 #endif 65 66 /* 67 * globals 68 */ 69 70 struct kern_history_head kern_histories; 71 72 int kernhist_print_enabled = 1; 73 74 #ifdef DDB 75 76 /* 77 * prototypes 78 */ 79 80 void kernhist_dump(struct kern_history *); 81 void kernhist_dumpmask(u_int32_t); 82 static void kernhist_dump_histories(struct kern_history *[]); 83 84 85 /* 86 * call this from ddb 87 * 88 * expects the system to be quiesced, no locking 89 */ 90 void 91 kernhist_dump(struct kern_history *l) 92 { 93 int lcv; 94 95 lcv = l->f; 96 do { 97 if (l->e[lcv].fmt) 98 kernhist_entry_print(&l->e[lcv]); 99 lcv = (lcv + 1) % l->n; 100 } while (lcv != l->f); 101 } 102 103 /* 104 * print a merged list of kern_history structures 105 */ 106 static void 107 kernhist_dump_histories(struct kern_history *hists[]) 108 { 109 struct timeval tv; 110 int cur[MAXHISTS]; 111 int lcv, hi; 112 113 /* find the first of each list */ 114 for (lcv = 0; hists[lcv]; lcv++) 115 cur[lcv] = hists[lcv]->f; 116 117 /* 118 * here we loop "forever", finding the next earliest 119 * history entry and printing it. cur[X] is the current 120 * entry to test for the history in hists[X]. if it is 121 * -1, then this history is finished. 122 */ 123 for (;;) { 124 hi = -1; 125 tv.tv_sec = tv.tv_usec = 0; 126 127 /* loop over each history */ 128 for (lcv = 0; hists[lcv]; lcv++) { 129 restart: 130 if (cur[lcv] == -1) 131 continue; 132 if (!hists[lcv]->e) 133 continue; 134 135 /* 136 * if the format is empty, go to the next entry 137 * and retry. 138 */ 139 if (hists[lcv]->e[cur[lcv]].fmt == NULL) { 140 cur[lcv] = (cur[lcv] + 1) % (hists[lcv]->n); 141 if (cur[lcv] == hists[lcv]->f) 142 cur[lcv] = -1; 143 goto restart; 144 } 145 146 /* 147 * if the time hasn't been set yet, or this entry is 148 * earlier than the current tv, set the time and history 149 * index. 150 */ 151 if (tv.tv_sec == 0 || 152 timercmp(&hists[lcv]->e[cur[lcv]].tv, &tv, <)) { 153 tv = hists[lcv]->e[cur[lcv]].tv; 154 hi = lcv; 155 } 156 } 157 158 /* if we didn't find any entries, we must be done */ 159 if (hi == -1) 160 break; 161 162 /* print and move to the next entry */ 163 kernhist_entry_print(&hists[hi]->e[cur[hi]]); 164 cur[hi] = (cur[hi] + 1) % (hists[hi]->n); 165 if (cur[hi] == hists[hi]->f) 166 cur[hi] = -1; 167 } 168 } 169 170 /* 171 * call this from ddb. `bitmask' is from <sys/kernhist.h>. it 172 * merges the named histories. 173 * 174 * expects the system to be quiesced, no locking 175 */ 176 void 177 kernhist_dumpmask(u_int32_t bitmask) /* XXX only support 32 hists */ 178 { 179 struct kern_history *hists[MAXHISTS + 1]; 180 int i = 0; 181 182 #ifdef UVMHIST 183 if ((bitmask & KERNHIST_UVMMAPHIST) || bitmask == 0) 184 hists[i++] = &maphist; 185 186 if ((bitmask & KERNHIST_UVMPDHIST) || bitmask == 0) 187 hists[i++] = &pdhist; 188 189 if ((bitmask & KERNHIST_UVMUBCHIST) || bitmask == 0) 190 hists[i++] = &ubchist; 191 192 if ((bitmask & KERNHIST_UVMLOANHIST) || bitmask == 0) 193 hists[i++] = &loanhist; 194 #endif 195 196 #ifdef USB_DEBUG 197 if ((bitmask & KERNHIST_USBHIST) || bitmask == 0) 198 hists[i++] = &usbhist; 199 #endif 200 201 #ifdef SYSCALL_DEBUG 202 if ((bitmask & KERNHIST_SCDEBUGHIST) || bitmask == 0) 203 hists[i++] = &scdebughist; 204 #endif 205 206 hists[i] = NULL; 207 208 kernhist_dump_histories(hists); 209 } 210 211 /* 212 * kernhist_print: ddb hook to print kern history 213 */ 214 void 215 kernhist_print(void (*pr)(const char *, ...)) 216 { 217 kernhist_dump(LIST_FIRST(&kern_histories)); 218 } 219 220 #endif 221
Indexes created Tue Sep 30 20:09:53 GMT 2025