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 1.49 2008/06/04 12:45:28 ad 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 1.49 2008/06/04 12:45:28 ad Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/proc.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/sysctl.h> 51 52 #include <uvm/uvm_extern.h> 53 #include <uvm/uvm_pdpolicy.h> 54 55 /* 56 * maxslp: ???? XXXCDC 57 */ 58 59 int maxslp = MAXSLP; /* patchable ... */ 60 struct loadavg averunnable; 61 62 /* 63 * constants for averages over 1, 5, and 15 minutes when sampling at 64 * 5 second intervals. 65 */ 66 67 static const fixpt_t cexp[3] = { 68 0.9200444146293232 * FSCALE, /* exp(-1/12) */ 69 0.9834714538216174 * FSCALE, /* exp(-1/60) */ 70 0.9944598480048967 * FSCALE, /* exp(-1/180) */ 71 }; 72 73 /* 74 * prototypes 75 */ 76 77 static void uvm_loadav(struct loadavg *); 78 static void uvm_total(struct vmtotal *); 79 80 /* 81 * uvm_meter: calculate load average and wake up the swapper (if needed) 82 */ 83 void 84 uvm_meter(void) 85 { 86 static int count; 87 88 if (++count >= 5) { 89 count = 0; 90 uvm_loadav(&averunnable); 91 } 92 if (lwp0.l_slptime > (maxslp / 2)) 93 uvm_kick_scheduler(); 94 } 95 96 /* 97 * uvm_loadav: compute a tenex style load average of a quantity on 98 * 1, 5, and 15 minute intervals. 99 */ 100 static void 101 uvm_loadav(struct loadavg *avg) 102 { 103 int i, nrun; 104 struct lwp *l; 105 106 nrun = 0; 107 108 mutex_enter(proc_lock); 109 LIST_FOREACH(l, &alllwp, l_list) { 110 if ((l->l_flag & (LW_SINTR | LW_SYSTEM)) != 0) 111 continue; 112 switch (l->l_stat) { 113 case LSSLEEP: 114 if (l->l_slptime > 1) 115 continue; 116 /* fall through */ 117 case LSRUN: 118 case LSONPROC: 119 case LSIDL: 120 nrun++; 121 } 122 } 123 mutex_exit(proc_lock); 124 125 for (i = 0; i < 3; i++) 126 avg->ldavg[i] = (cexp[i] * avg->ldavg[i] + 127 nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT; 128 } 129 130 /* 131 * sysctl helper routine for the vm.vmmeter node. 132 */ 133 static int 134 sysctl_vm_meter(SYSCTLFN_ARGS) 135 { 136 struct sysctlnode node; 137 struct vmtotal vmtotals; 138 139 node = *rnode; 140 node.sysctl_data = &vmtotals; 141 uvm_total(&vmtotals); 142 143 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 144 } 145 146 /* 147 * sysctl helper routine for the vm.uvmexp node. 148 */ 149 static int 150 sysctl_vm_uvmexp(SYSCTLFN_ARGS) 151 { 152 struct sysctlnode node; 153 154 node = *rnode; 155 if (oldp) 156 node.sysctl_size = min(*oldlenp, node.sysctl_size); 157 158 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 159 } 160 161 static int 162 sysctl_vm_uvmexp2(SYSCTLFN_ARGS) 163 { 164 struct sysctlnode node; 165 struct uvmexp_sysctl u; 166 int active, inactive; 167 168 uvm_estimatepageable(&active, &inactive); 169 170 memset(&u, 0, sizeof(u)); 171 172 /* Entries here are in order of uvmexp_sysctl, not uvmexp */ 173 u.pagesize = uvmexp.pagesize; 174 u.pagemask = uvmexp.pagemask; 175 u.pageshift = uvmexp.pageshift; 176 u.npages = uvmexp.npages; 177 u.free = uvmexp.free; 178 u.active = active; 179 u.inactive = inactive; 180 u.paging = uvmexp.paging; 181 u.wired = uvmexp.wired; 182 u.zeropages = uvmexp.zeropages; 183 u.reserve_pagedaemon = uvmexp.reserve_pagedaemon; 184 u.reserve_kernel = uvmexp.reserve_kernel; 185 u.freemin = uvmexp.freemin; 186 u.freetarg = uvmexp.freetarg; 187 u.inactarg = 0; /* unused */ 188 u.wiredmax = uvmexp.wiredmax; 189 u.nswapdev = uvmexp.nswapdev; 190 u.swpages = uvmexp.swpages; 191 u.swpginuse = uvmexp.swpginuse; 192 u.swpgonly = uvmexp.swpgonly; 193 u.nswget = uvmexp.nswget; 194 u.faults = uvmexp.faults; 195 u.traps = uvmexp.traps; 196 u.intrs = uvmexp.intrs; 197 u.swtch = uvmexp.swtch; 198 u.softs = uvmexp.softs; 199 u.syscalls = uvmexp.syscalls; 200 u.pageins = uvmexp.pageins; 201 u.swapins = uvmexp.swapins; 202 u.swapouts = uvmexp.swapouts; 203 u.pgswapin = uvmexp.pgswapin; 204 u.pgswapout = uvmexp.pgswapout; 205 u.forks = uvmexp.forks; 206 u.forks_ppwait = uvmexp.forks_ppwait; 207 u.forks_sharevm = uvmexp.forks_sharevm; 208 u.pga_zerohit = uvmexp.pga_zerohit; 209 u.pga_zeromiss = uvmexp.pga_zeromiss; 210 u.zeroaborts = uvmexp.zeroaborts; 211 u.fltnoram = uvmexp.fltnoram; 212 u.fltnoanon = uvmexp.fltnoanon; 213 u.fltpgwait = uvmexp.fltpgwait; 214 u.fltpgrele = uvmexp.fltpgrele; 215 u.fltrelck = uvmexp.fltrelck; 216 u.fltrelckok = uvmexp.fltrelckok; 217 u.fltanget = uvmexp.fltanget; 218 u.fltanretry = uvmexp.fltanretry; 219 u.fltamcopy = uvmexp.fltamcopy; 220 u.fltnamap = uvmexp.fltnamap; 221 u.fltnomap = uvmexp.fltnomap; 222 u.fltlget = uvmexp.fltlget; 223 u.fltget = uvmexp.fltget; 224 u.flt_anon = uvmexp.flt_anon; 225 u.flt_acow = uvmexp.flt_acow; 226 u.flt_obj = uvmexp.flt_obj; 227 u.flt_prcopy = uvmexp.flt_prcopy; 228 u.flt_przero = uvmexp.flt_przero; 229 u.pdwoke = uvmexp.pdwoke; 230 u.pdrevs = uvmexp.pdrevs; 231 u.pdswout = uvmexp.pdswout; 232 u.pdfreed = uvmexp.pdfreed; 233 u.pdscans = uvmexp.pdscans; 234 u.pdanscan = uvmexp.pdanscan; 235 u.pdobscan = uvmexp.pdobscan; 236 u.pdreact = uvmexp.pdreact; 237 u.pdbusy = uvmexp.pdbusy; 238 u.pdpageouts = uvmexp.pdpageouts; 239 u.pdpending = uvmexp.pdpending; 240 u.pddeact = uvmexp.pddeact; 241 u.anonpages = uvmexp.anonpages; 242 u.filepages = uvmexp.filepages; 243 u.execpages = uvmexp.execpages; 244 u.colorhit = uvmexp.colorhit; 245 u.colormiss = uvmexp.colormiss; 246 u.cpuhit = uvmexp.cpuhit; 247 u.cpumiss = uvmexp.cpumiss; 248 249 node = *rnode; 250 node.sysctl_data = &u; 251 node.sysctl_size = sizeof(u); 252 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 253 } 254 255 /* 256 * sysctl helper routine for uvm_pctparam. 257 */ 258 static int 259 uvm_sysctlpctparam(SYSCTLFN_ARGS) 260 { 261 int t, error; 262 struct sysctlnode node; 263 struct uvm_pctparam *pct; 264 265 pct = rnode->sysctl_data; 266 t = pct->pct_pct; 267 268 node = *rnode; 269 node.sysctl_data = &t; 270 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 271 if (error || newp == NULL) 272 return error; 273 274 if (t < 0 || t > 100) 275 return EINVAL; 276 277 error = uvm_pctparam_check(pct, t); 278 if (error) { 279 return error; 280 } 281 uvm_pctparam_set(pct, t); 282 283 return (0); 284 } 285 286 /* 287 * uvm_sysctl: sysctl hook into UVM system. 288 */ 289 SYSCTL_SETUP(sysctl_vm_setup, "sysctl vm subtree setup") 290 { 291 292 sysctl_createv(clog, 0, NULL, NULL, 293 CTLFLAG_PERMANENT, 294 CTLTYPE_NODE, "vm", NULL, 295 NULL, 0, NULL, 0, 296 CTL_VM, CTL_EOL); 297 sysctl_createv(clog, 0, NULL, NULL, 298 CTLFLAG_PERMANENT, 299 CTLTYPE_STRUCT, "vmmeter", 300 SYSCTL_DESCR("Simple system-wide virtual memory " 301 "statistics"), 302 sysctl_vm_meter, 0, NULL, sizeof(struct vmtotal), 303 CTL_VM, VM_METER, CTL_EOL); 304 sysctl_createv(clog, 0, NULL, NULL, 305 CTLFLAG_PERMANENT, 306 CTLTYPE_STRUCT, "loadavg", 307 SYSCTL_DESCR("System load average history"), 308 NULL, 0, &averunnable, sizeof(averunnable), 309 CTL_VM, VM_LOADAVG, CTL_EOL); 310 sysctl_createv(clog, 0, NULL, NULL, 311 CTLFLAG_PERMANENT, 312 CTLTYPE_STRUCT, "uvmexp", 313 SYSCTL_DESCR("Detailed system-wide virtual memory " 314 "statistics"), 315 sysctl_vm_uvmexp, 0, &uvmexp, sizeof(uvmexp), 316 CTL_VM, VM_UVMEXP, CTL_EOL); 317 sysctl_createv(clog, 0, NULL, NULL, 318 CTLFLAG_PERMANENT, 319 CTLTYPE_INT, "nkmempages", 320 SYSCTL_DESCR("Default number of pages in kmem_map"), 321 NULL, 0, &nkmempages, 0, 322 CTL_VM, VM_NKMEMPAGES, CTL_EOL); 323 sysctl_createv(clog, 0, NULL, NULL, 324 CTLFLAG_PERMANENT, 325 CTLTYPE_STRUCT, "uvmexp2", 326 SYSCTL_DESCR("Detailed system-wide virtual memory " 327 "statistics (MI)"), 328 sysctl_vm_uvmexp2, 0, NULL, 0, 329 CTL_VM, VM_UVMEXP2, CTL_EOL); 330 sysctl_createv(clog, 0, NULL, NULL, 331 CTLFLAG_PERMANENT, CTLTYPE_INT, "maxslp", 332 SYSCTL_DESCR("Maximum process sleep time before being " 333 "swapped"), 334 NULL, 0, &maxslp, 0, 335 CTL_VM, VM_MAXSLP, CTL_EOL); 336 sysctl_createv(clog, 0, NULL, NULL, 337 CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE, 338 CTLTYPE_INT, "uspace", 339 SYSCTL_DESCR("Number of bytes allocated for a kernel " 340 "stack"), 341 NULL, USPACE, NULL, 0, 342 CTL_VM, VM_USPACE, CTL_EOL); 343 sysctl_createv(clog, 0, NULL, NULL, 344 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 345 CTLTYPE_INT, "idlezero", 346 SYSCTL_DESCR("Whether try to zero pages in idle loop"), 347 NULL, 0, &vm_page_zero_enable, 0, 348 CTL_VM, CTL_CREATE, CTL_EOL); 349 350 uvmpdpol_sysctlsetup(); 351 } 352 353 /* 354 * uvm_total: calculate the current state of the system. 355 */ 356 static void 357 uvm_total(struct vmtotal *totalp) 358 { 359 struct lwp *l; 360 #if 0 361 struct vm_map_entry * entry; 362 struct vm_map *map; 363 int paging; 364 #endif 365 int active; 366 367 memset(totalp, 0, sizeof *totalp); 368 369 /* 370 * calculate process statistics 371 */ 372 mutex_enter(proc_lock); 373 LIST_FOREACH(l, &alllwp, l_list) { 374 if (l->l_proc->p_flag & PK_SYSTEM) 375 continue; 376 switch (l->l_stat) { 377 case 0: 378 continue; 379 380 case LSSLEEP: 381 case LSSTOP: 382 if (l->l_flag & LW_INMEM) { 383 if (lwp_eprio(l) <= PZERO) 384 totalp->t_dw++; 385 else if (l->l_slptime < maxslp) 386 totalp->t_sl++; 387 } else if (l->l_slptime < maxslp) 388 totalp->t_sw++; 389 if (l->l_slptime >= maxslp) 390 continue; 391 break; 392 393 case LSRUN: 394 case LSONPROC: 395 case LSIDL: 396 if (l->l_flag & LW_INMEM) 397 totalp->t_rq++; 398 else 399 totalp->t_sw++; 400 if (l->l_stat == LSIDL) 401 continue; 402 break; 403 } 404 /* 405 * note active objects 406 */ 407 #if 0 408 /* 409 * XXXCDC: BOGUS! rethink this. in the mean time 410 * don't do it. 411 */ 412 paging = 0; 413 vm_map_lock(map); 414 for (map = &p->p_vmspace->vm_map, entry = map->header.next; 415 entry != &map->header; entry = entry->next) { 416 if (entry->is_a_map || entry->is_sub_map || 417 entry->object.uvm_obj == NULL) 418 continue; 419 /* XXX how to do this with uvm */ 420 } 421 vm_map_unlock(map); 422 if (paging) 423 totalp->t_pw++; 424 #endif 425 } 426 mutex_exit(proc_lock); 427 428 /* 429 * Calculate object memory usage statistics. 430 */ 431 uvm_estimatepageable(&active, NULL); 432 totalp->t_free = uvmexp.free; 433 totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse; 434 totalp->t_avm = active + uvmexp.swpginuse; /* XXX */ 435 totalp->t_rm = uvmexp.npages - uvmexp.free; 436 totalp->t_arm = active; 437 totalp->t_vmshr = 0; /* XXX */ 438 totalp->t_avmshr = 0; /* XXX */ 439 totalp->t_rmshr = 0; /* XXX */ 440 totalp->t_armshr = 0; /* XXX */ 441 } 442 443 void 444 uvm_pctparam_set(struct uvm_pctparam *pct, int val) 445 { 446 447 pct->pct_pct = val; 448 pct->pct_scaled = val * UVM_PCTPARAM_SCALE / 100; 449 } 450 451 int 452 uvm_pctparam_get(struct uvm_pctparam *pct) 453 { 454 455 return pct->pct_pct; 456 } 457 458 int 459 uvm_pctparam_check(struct uvm_pctparam *pct, int val) 460 { 461 462 if (pct->pct_check == NULL) { 463 return 0; 464 } 465 return (*pct->pct_check)(pct, val); 466 } 467 468 void 469 uvm_pctparam_init(struct uvm_pctparam *pct, int val, 470 int (*fn)(struct uvm_pctparam *, int)) 471 { 472 473 pct->pct_check = fn; 474 uvm_pctparam_set(pct, val); 475 } 476 477 int 478 uvm_pctparam_createsysctlnode(struct uvm_pctparam *pct, const char *name, 479 const char *desc) 480 { 481 482 return sysctl_createv(NULL, 0, NULL, NULL, 483 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 484 CTLTYPE_INT, name, SYSCTL_DESCR(desc), 485 uvm_sysctlpctparam, 0, pct, 0, CTL_VM, CTL_CREATE, CTL_EOL); 486 }
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