Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_meter.c
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1 /* $NetBSD: uvm_meter.c,v 1.31.2.1 2004/05/28 07:15:26 tron Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Charles D. Cranor and Washington University. 5 * Copyright (c) 1982, 1986, 1989, 1993 6 * The Regents of the University of California. 7 * 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Charles D. Cranor, 21 * Washington University, and the University of California, Berkeley 22 * and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 40 * from: Id: uvm_meter.c,v 1.1.2.1 1997/08/14 19:10:35 chuck Exp 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: uvm_meter.c,v 1.31.2.1 2004/05/28 07:15:26 tron Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/proc.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <uvm/uvm_extern.h> 51 #include <sys/sysctl.h> 52 53 /* 54 * maxslp: ???? XXXCDC 55 */ 56 57 int maxslp = MAXSLP; /* patchable ... */ 58 struct loadavg averunnable; 59 60 /* 61 * constants for averages over 1, 5, and 15 minutes when sampling at 62 * 5 second intervals. 63 */ 64 65 static fixpt_t cexp[3] = { 66 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 67 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 68 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 69 }; 70 71 /* 72 * prototypes 73 */ 74 75 static void uvm_loadav(struct loadavg *); 76 static void uvm_total(struct vmtotal *); 77 78 /* 79 * uvm_meter: calculate load average and wake up the swapper (if needed) 80 */ 81 void 82 uvm_meter() 83 { 84 if ((time.tv_sec % 5) == 0) 85 uvm_loadav(&averunnable); 86 if (lwp0.l_slptime > (maxslp / 2)) 87 wakeup(&proc0); 88 } 89 90 /* 91 * uvm_loadav: compute a tenex style load average of a quantity on 92 * 1, 5, and 15 minute internvals. 93 */ 94 static void 95 uvm_loadav(avg) 96 struct loadavg *avg; 97 { 98 int i, nrun; 99 struct lwp *l; 100 101 proclist_lock_read(); 102 nrun = 0; 103 LIST_FOREACH(l, &alllwp, l_list) { 104 switch (l->l_stat) { 105 case LSSLEEP: 106 if (l->l_priority > PZERO || l->l_slptime > 1) 107 continue; 108 /* fall through */ 109 case LSRUN: 110 case LSONPROC: 111 case LSIDL: 112 nrun++; 113 } 114 } 115 proclist_unlock_read(); 116 for (i = 0; i < 3; i++) 117 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 118 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 119 } 120 121 /* 122 * sysctl helper routine for the vm.vmmeter node. 123 */ 124 static int 125 sysctl_vm_meter(SYSCTLFN_ARGS) 126 { 127 struct sysctlnode node; 128 struct vmtotal vmtotals; 129 130 node = *rnode; 131 node.sysctl_data = &vmtotals; 132 uvm_total(&vmtotals); 133 134 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 135 } 136 137 /* 138 * sysctl helper routine for the vm.uvmexp node. 139 */ 140 static int 141 sysctl_vm_uvmexp(SYSCTLFN_ARGS) 142 { 143 struct sysctlnode node; 144 145 node = *rnode; 146 if (oldp) 147 node.sysctl_size = min(*oldlenp, node.sysctl_size); 148 149 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 150 } 151 152 static int 153 sysctl_vm_uvmexp2(SYSCTLFN_ARGS) 154 { 155 struct sysctlnode node; 156 struct uvmexp_sysctl u; 157 158 memset(&u, 0, sizeof(u)); 159 160 /* Entries here are in order of uvmexp_sysctl, not uvmexp */ 161 u.pagesize = uvmexp.pagesize; 162 u.pagemask = uvmexp.pagemask; 163 u.pageshift = uvmexp.pageshift; 164 u.npages = uvmexp.npages; 165 u.free = uvmexp.free; 166 u.active = uvmexp.active; 167 u.inactive = uvmexp.inactive; 168 u.paging = uvmexp.paging; 169 u.wired = uvmexp.wired; 170 u.zeropages = uvmexp.zeropages; 171 u.reserve_pagedaemon = uvmexp.reserve_pagedaemon; 172 u.reserve_kernel = uvmexp.reserve_kernel; 173 u.freemin = uvmexp.freemin; 174 u.freetarg = uvmexp.freetarg; 175 u.inactarg = uvmexp.inactarg; 176 u.wiredmax = uvmexp.wiredmax; 177 u.nswapdev = uvmexp.nswapdev; 178 u.swpages = uvmexp.swpages; 179 u.swpginuse = uvmexp.swpginuse; 180 u.swpgonly = uvmexp.swpgonly; 181 u.nswget = uvmexp.nswget; 182 u.nanon = uvmexp.nanon; 183 u.nanonneeded = uvmexp.nanonneeded; 184 u.nfreeanon = uvmexp.nfreeanon; 185 u.faults = uvmexp.faults; 186 u.traps = uvmexp.traps; 187 u.intrs = uvmexp.intrs; 188 u.swtch = uvmexp.swtch; 189 u.softs = uvmexp.softs; 190 u.syscalls = uvmexp.syscalls; 191 u.pageins = uvmexp.pageins; 192 u.swapins = uvmexp.swapins; 193 u.swapouts = uvmexp.swapouts; 194 u.pgswapin = uvmexp.pgswapin; 195 u.pgswapout = uvmexp.pgswapout; 196 u.forks = uvmexp.forks; 197 u.forks_ppwait = uvmexp.forks_ppwait; 198 u.forks_sharevm = uvmexp.forks_sharevm; 199 u.pga_zerohit = uvmexp.pga_zerohit; 200 u.pga_zeromiss = uvmexp.pga_zeromiss; 201 u.zeroaborts = uvmexp.zeroaborts; 202 u.fltnoram = uvmexp.fltnoram; 203 u.fltnoanon = uvmexp.fltnoanon; 204 u.fltpgwait = uvmexp.fltpgwait; 205 u.fltpgrele = uvmexp.fltpgrele; 206 u.fltrelck = uvmexp.fltrelck; 207 u.fltrelckok = uvmexp.fltrelckok; 208 u.fltanget = uvmexp.fltanget; 209 u.fltanretry = uvmexp.fltanretry; 210 u.fltamcopy = uvmexp.fltamcopy; 211 u.fltnamap = uvmexp.fltnamap; 212 u.fltnomap = uvmexp.fltnomap; 213 u.fltlget = uvmexp.fltlget; 214 u.fltget = uvmexp.fltget; 215 u.flt_anon = uvmexp.flt_anon; 216 u.flt_acow = uvmexp.flt_acow; 217 u.flt_obj = uvmexp.flt_obj; 218 u.flt_prcopy = uvmexp.flt_prcopy; 219 u.flt_przero = uvmexp.flt_przero; 220 u.pdwoke = uvmexp.pdwoke; 221 u.pdrevs = uvmexp.pdrevs; 222 u.pdswout = uvmexp.pdswout; 223 u.pdfreed = uvmexp.pdfreed; 224 u.pdscans = uvmexp.pdscans; 225 u.pdanscan = uvmexp.pdanscan; 226 u.pdobscan = uvmexp.pdobscan; 227 u.pdreact = uvmexp.pdreact; 228 u.pdbusy = uvmexp.pdbusy; 229 u.pdpageouts = uvmexp.pdpageouts; 230 u.pdpending = uvmexp.pdpending; 231 u.pddeact = uvmexp.pddeact; 232 u.anonpages = uvmexp.anonpages; 233 u.filepages = uvmexp.filepages; 234 u.execpages = uvmexp.execpages; 235 u.colorhit = uvmexp.colorhit; 236 u.colormiss = uvmexp.colormiss; 237 238 node = *rnode; 239 node.sysctl_data = &u; 240 node.sysctl_size = sizeof(u); 241 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 242 } 243 244 /* 245 * sysctl helper routine for the vm.{anon,exec,file}{min,max} nodes. 246 * makes sure that they all correlate properly and none are set too 247 * large. 248 */ 249 static int 250 sysctl_vm_updateminmax(SYSCTLFN_ARGS) 251 { 252 int t, error; 253 struct sysctlnode node; 254 255 node = *rnode; 256 node.sysctl_data = &t; 257 t = *(int*)rnode->sysctl_data; 258 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 259 if (error || newp == NULL) 260 return (error); 261 262 if (t < 0 || t > 100) 263 return (EINVAL); 264 265 #define UPDATEMIN(a, ap, bp, cp, tp) do { \ 266 if (tp + uvmexp.bp + uvmexp.cp > 95) \ 267 return (EINVAL); \ 268 uvmexp.ap = tp; \ 269 uvmexp.a = uvmexp.ap * 256 / 100; \ 270 } while (0/*CONSTCOND*/) 271 272 #define UPDATEMAX(a, ap, tp) do { \ 273 uvmexp.ap = tp; \ 274 uvmexp.a = tp * 256 / 100; \ 275 } while (0/*CONSTCOND*/) 276 277 switch (rnode->sysctl_num) { 278 case VM_ANONMIN: 279 UPDATEMIN(anonmin, anonminpct, fileminpct, execminpct, t); 280 break; 281 case VM_EXECMIN: 282 UPDATEMIN(execmin, execminpct, anonminpct, fileminpct, t); 283 break; 284 case VM_FILEMIN: 285 UPDATEMIN(filemin, fileminpct, execminpct, anonminpct, t); 286 break; 287 case VM_ANONMAX: 288 UPDATEMAX(anonmax, anonmaxpct, t); 289 break; 290 case VM_EXECMAX: 291 UPDATEMAX(execmax, execmaxpct, t); 292 break; 293 case VM_FILEMAX: 294 UPDATEMAX(filemax, filemaxpct, t); 295 break; 296 default: 297 return (EINVAL); 298 } 299 300 #undef UPDATEMIN 301 #undef UPDATEMAX 302 303 return (0); 304 } 305 306 /* 307 * uvm_sysctl: sysctl hook into UVM system. 308 */ 309 SYSCTL_SETUP(sysctl_vm_setup, "sysctl vm subtree setup") 310 { 311 312 sysctl_createv(clog, 0, NULL, NULL, 313 CTLFLAG_PERMANENT, 314 CTLTYPE_NODE, "vm", NULL, 315 NULL, 0, NULL, 0, 316 CTL_VM, CTL_EOL); 317 sysctl_createv(clog, 0, NULL, NULL, 318 CTLFLAG_PERMANENT, 319 CTLTYPE_STRUCT, "vmmeter", 320 SYSCTL_DESCR("Simple system-wide virtual memory " 321 "statistics"), 322 sysctl_vm_meter, 0, NULL, sizeof(struct vmtotal), 323 CTL_VM, VM_METER, CTL_EOL); 324 sysctl_createv(clog, 0, NULL, NULL, 325 CTLFLAG_PERMANENT, 326 CTLTYPE_STRUCT, "loadavg", 327 SYSCTL_DESCR("System load average history"), 328 NULL, 0, &averunnable, sizeof(averunnable), 329 CTL_VM, VM_LOADAVG, CTL_EOL); 330 sysctl_createv(clog, 0, NULL, NULL, 331 CTLFLAG_PERMANENT, 332 CTLTYPE_STRUCT, "uvmexp", 333 SYSCTL_DESCR("Detailed system-wide virtual memory " 334 "statistics"), 335 sysctl_vm_uvmexp, 0, &uvmexp, sizeof(uvmexp), 336 CTL_VM, VM_UVMEXP, CTL_EOL); 337 sysctl_createv(clog, 0, NULL, NULL, 338 CTLFLAG_PERMANENT, 339 CTLTYPE_INT, "nkmempages", 340 SYSCTL_DESCR("Default number of pages in kmem_map"), 341 NULL, 0, &nkmempages, 0, 342 CTL_VM, VM_NKMEMPAGES, CTL_EOL); 343 sysctl_createv(clog, 0, NULL, NULL, 344 CTLFLAG_PERMANENT, 345 CTLTYPE_STRUCT, "uvmexp2", 346 SYSCTL_DESCR("Detailed system-wide virtual memory " 347 "statistics (MI)"), 348 sysctl_vm_uvmexp2, 0, NULL, 0, 349 CTL_VM, VM_UVMEXP2, CTL_EOL); 350 sysctl_createv(clog, 0, NULL, NULL, 351 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 352 CTLTYPE_INT, "anonmin", 353 SYSCTL_DESCR("Percentage of physical memory reserved " 354 "for anonymous application data"), 355 sysctl_vm_updateminmax, 0, &uvmexp.anonminpct, 0, 356 CTL_VM, VM_ANONMIN, CTL_EOL); 357 sysctl_createv(clog, 0, NULL, NULL, 358 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 359 CTLTYPE_INT, "execmin", 360 SYSCTL_DESCR("Percentage of physical memory reserved " 361 "for cached executable data"), 362 sysctl_vm_updateminmax, 0, &uvmexp.execminpct, 0, 363 CTL_VM, VM_EXECMIN, CTL_EOL); 364 sysctl_createv(clog, 0, NULL, NULL, 365 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 366 CTLTYPE_INT, "filemin", 367 SYSCTL_DESCR("Percentage of physical memory reserved " 368 "for cached file data"), 369 sysctl_vm_updateminmax, 0, &uvmexp.fileminpct, 0, 370 CTL_VM, VM_FILEMIN, CTL_EOL); 371 sysctl_createv(clog, 0, NULL, NULL, 372 CTLFLAG_PERMANENT, CTLTYPE_INT, "maxslp", 373 SYSCTL_DESCR("Maximum process sleep time before being " 374 "swapped"), 375 NULL, 0, &maxslp, 0, 376 CTL_VM, VM_MAXSLP, CTL_EOL); 377 sysctl_createv(clog, 0, NULL, NULL, 378 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 379 CTLTYPE_INT, "uspace", 380 SYSCTL_DESCR("Number of bytes allocated for a kernel " 381 "stack"), 382 NULL, USPACE, NULL, 0, 383 CTL_VM, VM_USPACE, CTL_EOL); 384 sysctl_createv(clog, 0, NULL, NULL, 385 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 386 CTLTYPE_INT, "anonmax", 387 SYSCTL_DESCR("Percentage of physical memory which will " 388 "be reclaimed from other usage for " 389 "anonymous application data"), 390 sysctl_vm_updateminmax, 0, &uvmexp.anonmaxpct, 0, 391 CTL_VM, VM_ANONMAX, CTL_EOL); 392 sysctl_createv(clog, 0, NULL, NULL, 393 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 394 CTLTYPE_INT, "execmax", 395 SYSCTL_DESCR("Percentage of physical memory which will " 396 "be reclaimed from other usage for cached " 397 "executable data"), 398 sysctl_vm_updateminmax, 0, &uvmexp.execmaxpct, 0, 399 CTL_VM, VM_EXECMAX, CTL_EOL); 400 sysctl_createv(clog, 0, NULL, NULL, 401 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 402 CTLTYPE_INT, "filemax", 403 SYSCTL_DESCR("Percentage of physical memory which will " 404 "be reclaimed from other usage for cached " 405 "file data"), 406 sysctl_vm_updateminmax, 0, &uvmexp.filemaxpct, 0, 407 CTL_VM, VM_FILEMAX, CTL_EOL); 408 } 409 410 /* 411 * uvm_total: calculate the current state of the system. 412 */ 413 static void 414 uvm_total(totalp) 415 struct vmtotal *totalp; 416 { 417 struct lwp *l; 418 #if 0 419 struct vm_map_entry * entry; 420 struct vm_map *map; 421 int paging; 422 #endif 423 424 memset(totalp, 0, sizeof *totalp); 425 426 /* 427 * calculate process statistics 428 */ 429 430 proclist_lock_read(); 431 LIST_FOREACH(l, &alllwp, l_list) { 432 if (l->l_proc->p_flag & P_SYSTEM) 433 continue; 434 switch (l->l_stat) { 435 case 0: 436 continue; 437 438 case LSSLEEP: 439 case LSSTOP: 440 if (l->l_flag & L_INMEM) { 441 if (l->l_priority <= PZERO) 442 totalp->t_dw++; 443 else if (l->l_slptime < maxslp) 444 totalp->t_sl++; 445 } else if (l->l_slptime < maxslp) 446 totalp->t_sw++; 447 if (l->l_slptime >= maxslp) 448 continue; 449 break; 450 451 case LSRUN: 452 case LSONPROC: 453 case LSIDL: 454 if (l->l_flag & L_INMEM) 455 totalp->t_rq++; 456 else 457 totalp->t_sw++; 458 if (l->l_stat == LSIDL) 459 continue; 460 break; 461 } 462 /* 463 * note active objects 464 */ 465 #if 0 466 /* 467 * XXXCDC: BOGUS! rethink this. in the mean time 468 * don't do it. 469 */ 470 paging = 0; 471 vm_map_lock(map); 472 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 473 entry != &map->header; entry = entry->next) { 474 if (entry->is_a_map || entry->is_sub_map || 475 entry->object.uvm_obj == NULL) 476 continue; 477 /* XXX how to do this with uvm */ 478 } 479 vm_map_unlock(map); 480 if (paging) 481 totalp->t_pw++; 482 #endif 483 } 484 proclist_unlock_read(); 485 /* 486 * Calculate object memory usage statistics. 487 */ 488 totalp->t_free = uvmexp.free; 489 totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse; 490 totalp->t_avm = uvmexp.active + uvmexp.swpginuse; /* XXX */ 491 totalp->t_rm = uvmexp.npages - uvmexp.free; 492 totalp->t_arm = uvmexp.active; 493 totalp->t_vmshr = 0; /* XXX */ 494 totalp->t_avmshr = 0; /* XXX */ 495 totalp->t_rmshr = 0; /* XXX */ 496 totalp->t_armshr = 0; /* XXX */ 497 }
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