1139825Simp/*- 21541Srgrimes * Copyright (c) 1991, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * This code is derived from software contributed to Berkeley by 61541Srgrimes * The Mach Operating System project at Carnegie-Mellon University. 71541Srgrimes * 81541Srgrimes * Redistribution and use in source and binary forms, with or without 91541Srgrimes * modification, are permitted provided that the following conditions 101541Srgrimes * are met: 111541Srgrimes * 1. Redistributions of source code must retain the above copyright 121541Srgrimes * notice, this list of conditions and the following disclaimer. 131541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer in the 151541Srgrimes * documentation and/or other materials provided with the distribution. 161541Srgrimes * 4. Neither the name of the University nor the names of its contributors 171541Srgrimes * may be used to endorse or promote products derived from this software 181541Srgrimes * without specific prior written permission. 191541Srgrimes * 201541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301541Srgrimes * SUCH DAMAGE. 311541Srgrimes * 321817Sdg * from: @(#)vm_glue.c 8.6 (Berkeley) 1/5/94 331541Srgrimes * 341541Srgrimes * 351541Srgrimes * Copyright (c) 1987, 1990 Carnegie-Mellon University. 361541Srgrimes * All rights reserved. 375455Sdg * 381541Srgrimes * Permission to use, copy, modify and distribute this software and 391541Srgrimes * its documentation is hereby granted, provided that both the copyright 401541Srgrimes * notice and this permission notice appear in all copies of the 411541Srgrimes * software, derivative works or modified versions, and any portions 421541Srgrimes * thereof, and that both notices appear in supporting documentation. 435455Sdg * 445455Sdg * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 455455Sdg * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 461541Srgrimes * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 475455Sdg * 481541Srgrimes * Carnegie Mellon requests users of this software to return to 491541Srgrimes * 501541Srgrimes * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 511541Srgrimes * School of Computer Science 521541Srgrimes * Carnegie Mellon University 531541Srgrimes * Pittsburgh PA 15213-3890 541541Srgrimes * 551541Srgrimes * any improvements or extensions that they make and grant Carnegie the 561541Srgrimes * rights to redistribute these changes. 571541Srgrimes */ 581541Srgrimes 59116226Sobrien#include <sys/cdefs.h> 60116226Sobrien__FBSDID("$FreeBSD$"); 61116226Sobrien 6239770Sabial#include "opt_vm.h" 63118234Speter#include "opt_kstack_pages.h" 64118234Speter#include "opt_kstack_max_pages.h" 6520821Sjoerg 661541Srgrimes#include <sys/param.h> 671541Srgrimes#include <sys/systm.h> 68114216Skan#include <sys/limits.h> 6976166Smarkm#include <sys/lock.h> 7076166Smarkm#include <sys/mutex.h> 711541Srgrimes#include <sys/proc.h> 72220373Strasz#include <sys/racct.h> 731541Srgrimes#include <sys/resourcevar.h> 74153485Salc#include <sys/sched.h> 75153485Salc#include <sys/sf_buf.h> 767430Sbde#include <sys/shm.h> 7712662Sdg#include <sys/vmmeter.h> 7874927Sjhb#include <sys/sx.h> 7931563Sdyson#include <sys/sysctl.h> 80229251Skib#include <sys/_kstack_cache.h> 81196730Skib#include <sys/eventhandler.h> 821549Srgrimes#include <sys/kernel.h> 8365557Sjasone#include <sys/ktr.h> 8424691Speter#include <sys/unistd.h> 851549Srgrimes 861541Srgrimes#include <vm/vm.h> 8712662Sdg#include <vm/vm_param.h> 8812662Sdg#include <vm/pmap.h> 8912662Sdg#include <vm/vm_map.h> 901541Srgrimes#include <vm/vm_page.h> 911549Srgrimes#include <vm/vm_pageout.h> 9299559Speter#include <vm/vm_object.h> 931541Srgrimes#include <vm/vm_kern.h> 9412662Sdg#include <vm/vm_extern.h> 9599559Speter#include <vm/vm_pager.h> 96107913Sdillon#include <vm/swap_pager.h> 971541Srgrimes 9889464Sbde#ifndef NO_SWAPPING 99172207Sjeffstatic int swapout(struct proc *); 100172207Sjeffstatic void swapclear(struct proc *); 101206483Salcstatic void vm_thread_swapin(struct thread *td); 102206483Salcstatic void vm_thread_swapout(struct thread *td); 10389464Sbde#endif 10412820Sphk 10598600Salc/* 10698600Salc * MPSAFE 107109572Sdillon * 108109572Sdillon * WARNING! This code calls vm_map_check_protection() which only checks 109109572Sdillon * the associated vm_map_entry range. It does not determine whether the 110109572Sdillon * contents of the memory is actually readable or writable. In most cases 111109572Sdillon * just checking the vm_map_entry is sufficient within the kernel's address 112109572Sdillon * space. 11398600Salc */ 1141541Srgrimesint 1151541Srgrimeskernacc(addr, len, rw) 116109630Salfred void *addr; 1171541Srgrimes int len, rw; 1181541Srgrimes{ 1191541Srgrimes boolean_t rv; 1201541Srgrimes vm_offset_t saddr, eaddr; 12152644Sphk vm_prot_t prot; 1221541Srgrimes 12389464Sbde KASSERT((rw & ~VM_PROT_ALL) == 0, 12452644Sphk ("illegal ``rw'' argument to kernacc (%x)\n", rw)); 125140622Salc 126140622Salc if ((vm_offset_t)addr + len > kernel_map->max_offset || 127140622Salc (vm_offset_t)addr + len < (vm_offset_t)addr) 128140622Salc return (FALSE); 129140622Salc 13052644Sphk prot = rw; 13140286Sdg saddr = trunc_page((vm_offset_t)addr); 13240286Sdg eaddr = round_page((vm_offset_t)addr + len); 133122384Salc vm_map_lock_read(kernel_map); 1341541Srgrimes rv = vm_map_check_protection(kernel_map, saddr, eaddr, prot); 135122384Salc vm_map_unlock_read(kernel_map); 1365455Sdg return (rv == TRUE); 1371541Srgrimes} 1381541Srgrimes 13998600Salc/* 14098600Salc * MPSAFE 141109572Sdillon * 142109572Sdillon * WARNING! This code calls vm_map_check_protection() which only checks 143109572Sdillon * the associated vm_map_entry range. It does not determine whether the 144109572Sdillon * contents of the memory is actually readable or writable. vmapbuf(), 145109572Sdillon * vm_fault_quick(), or copyin()/copout()/su*()/fu*() functions should be 146109572Sdillon * used in conjuction with this call. 14798600Salc */ 1481541Srgrimesint 1491541Srgrimesuseracc(addr, len, rw) 150109630Salfred void *addr; 1511541Srgrimes int len, rw; 1521541Srgrimes{ 1531541Srgrimes boolean_t rv; 15452644Sphk vm_prot_t prot; 155103767Sjake vm_map_t map; 1561541Srgrimes 15789464Sbde KASSERT((rw & ~VM_PROT_ALL) == 0, 15852644Sphk ("illegal ``rw'' argument to useracc (%x)\n", rw)); 15952644Sphk prot = rw; 160103767Sjake map = &curproc->p_vmspace->vm_map; 161103767Sjake if ((vm_offset_t)addr + len > vm_map_max(map) || 162103767Sjake (vm_offset_t)addr + len < (vm_offset_t)addr) { 1631549Srgrimes return (FALSE); 1641549Srgrimes } 165122384Salc vm_map_lock_read(map); 166103767Sjake rv = vm_map_check_protection(map, trunc_page((vm_offset_t)addr), 167103767Sjake round_page((vm_offset_t)addr + len), prot); 168122384Salc vm_map_unlock_read(map); 1695455Sdg return (rv == TRUE); 1701541Srgrimes} 1711541Srgrimes 172126668Struckmanint 173127008Struckmanvslock(void *addr, size_t len) 174126668Struckman{ 175127013Struckman vm_offset_t end, last, start; 176127013Struckman vm_size_t npages; 177127013Struckman int error; 178126668Struckman 179127013Struckman last = (vm_offset_t)addr + len; 180127007Struckman start = trunc_page((vm_offset_t)addr); 181127013Struckman end = round_page(last); 182127013Struckman if (last < (vm_offset_t)addr || end < (vm_offset_t)addr) 183126668Struckman return (EINVAL); 184126668Struckman npages = atop(end - start); 185126668Struckman if (npages > vm_page_max_wired) 186126668Struckman return (ENOMEM); 187126668Struckman#if 0 188126668Struckman /* 189126668Struckman * XXX - not yet 190126668Struckman * 191126668Struckman * The limit for transient usage of wired pages should be 192126668Struckman * larger than for "permanent" wired pages (mlock()). 193126668Struckman * 194126668Struckman * Also, the sysctl code, which is the only present user 195126668Struckman * of vslock(), does a hard loop on EAGAIN. 196126668Struckman */ 197170170Sattilio if (npages + cnt.v_wire_count > vm_page_max_wired) 198126668Struckman return (EAGAIN); 199126668Struckman#endif 200127007Struckman error = vm_map_wire(&curproc->p_vmspace->vm_map, start, end, 201129028Sgreen VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 202127007Struckman /* 203127007Struckman * Return EFAULT on error to match copy{in,out}() behaviour 204127007Struckman * rather than returning ENOMEM like mlock() would. 205127007Struckman */ 206127007Struckman return (error == KERN_SUCCESS ? 0 : EFAULT); 207126668Struckman} 208126668Struckman 209127007Struckmanvoid 210127008Struckmanvsunlock(void *addr, size_t len) 211126668Struckman{ 212126668Struckman 213127007Struckman /* Rely on the parameter sanity checks performed by vslock(). */ 214127007Struckman (void)vm_map_unwire(&curproc->p_vmspace->vm_map, 215127007Struckman trunc_page((vm_offset_t)addr), round_page((vm_offset_t)addr + len), 216127008Struckman VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 217126668Struckman} 218126668Struckman 219153485Salc/* 220153485Salc * Pin the page contained within the given object at the given offset. If the 221153485Salc * page is not resident, allocate and load it using the given object's pager. 222153485Salc * Return the pinned page if successful; otherwise, return NULL. 223153485Salc */ 224153485Salcstatic vm_page_t 225153485Salcvm_imgact_hold_page(vm_object_t object, vm_ooffset_t offset) 226153485Salc{ 227153485Salc vm_page_t m, ma[1]; 228153485Salc vm_pindex_t pindex; 229153485Salc int rv; 230153485Salc 231153485Salc VM_OBJECT_LOCK(object); 232153485Salc pindex = OFF_TO_IDX(offset); 233153485Salc m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 234193643Salc if (m->valid != VM_PAGE_BITS_ALL) { 235153485Salc ma[0] = m; 236153485Salc rv = vm_pager_get_pages(object, ma, 1, 0); 237153485Salc m = vm_page_lookup(object, pindex); 238153485Salc if (m == NULL) 239153485Salc goto out; 240193593Salc if (rv != VM_PAGER_OK) { 241207410Skmacy vm_page_lock(m); 242153485Salc vm_page_free(m); 243207410Skmacy vm_page_unlock(m); 244153485Salc m = NULL; 245153485Salc goto out; 246153485Salc } 247153485Salc } 248207410Skmacy vm_page_lock(m); 249153485Salc vm_page_hold(m); 250207410Skmacy vm_page_unlock(m); 251153485Salc vm_page_wakeup(m); 252153485Salcout: 253153485Salc VM_OBJECT_UNLOCK(object); 254153485Salc return (m); 255153485Salc} 256153485Salc 257153485Salc/* 258153485Salc * Return a CPU private mapping to the page at the given offset within the 259153485Salc * given object. The page is pinned before it is mapped. 260153485Salc */ 261153485Salcstruct sf_buf * 262153485Salcvm_imgact_map_page(vm_object_t object, vm_ooffset_t offset) 263153485Salc{ 264153485Salc vm_page_t m; 265153485Salc 266153485Salc m = vm_imgact_hold_page(object, offset); 267153485Salc if (m == NULL) 268153485Salc return (NULL); 269153485Salc sched_pin(); 270153485Salc return (sf_buf_alloc(m, SFB_CPUPRIVATE)); 271153485Salc} 272153485Salc 273153485Salc/* 274153485Salc * Destroy the given CPU private mapping and unpin the page that it mapped. 275153485Salc */ 276153485Salcvoid 277153485Salcvm_imgact_unmap_page(struct sf_buf *sf) 278153485Salc{ 279153485Salc vm_page_t m; 280153485Salc 281153485Salc m = sf_buf_page(sf); 282153485Salc sf_buf_free(sf); 283153485Salc sched_unpin(); 284207410Skmacy vm_page_lock(m); 285153485Salc vm_page_unhold(m); 286207410Skmacy vm_page_unlock(m); 287153485Salc} 288153485Salc 289198341Smarcelvoid 290198341Smarcelvm_sync_icache(vm_map_t map, vm_offset_t va, vm_offset_t sz) 291198341Smarcel{ 292198341Smarcel 293198341Smarcel pmap_sync_icache(map->pmap, va, sz); 294198341Smarcel} 295198341Smarcel 296229251Skibstruct kstack_cache_entry *kstack_cache; 297196730Skibstatic int kstack_cache_size = 128; 298196730Skibstatic int kstacks; 299196730Skibstatic struct mtx kstack_cache_mtx; 300196730SkibSYSCTL_INT(_vm, OID_AUTO, kstack_cache_size, CTLFLAG_RW, &kstack_cache_size, 0, 301196730Skib ""); 302196730SkibSYSCTL_INT(_vm, OID_AUTO, kstacks, CTLFLAG_RD, &kstacks, 0, 303196730Skib ""); 304196730Skib 305116355Salc#ifndef KSTACK_MAX_PAGES 306116355Salc#define KSTACK_MAX_PAGES 32 307116355Salc#endif 308116355Salc 30999559Speter/* 310116355Salc * Create the kernel stack (including pcb for i386) for a new thread. 311116355Salc * This routine directly affects the fork perf for a process and 312116355Salc * create performance for a thread. 313116355Salc */ 314173361Skibint 315116355Salcvm_thread_new(struct thread *td, int pages) 316116355Salc{ 317116355Salc vm_object_t ksobj; 318116355Salc vm_offset_t ks; 319116355Salc vm_page_t m, ma[KSTACK_MAX_PAGES]; 320196730Skib struct kstack_cache_entry *ks_ce; 321116355Salc int i; 322116355Salc 323116355Salc /* Bounds check */ 324116355Salc if (pages <= 1) 325116355Salc pages = KSTACK_PAGES; 326116355Salc else if (pages > KSTACK_MAX_PAGES) 327116355Salc pages = KSTACK_MAX_PAGES; 328196730Skib 329196730Skib if (pages == KSTACK_PAGES) { 330196730Skib mtx_lock(&kstack_cache_mtx); 331196730Skib if (kstack_cache != NULL) { 332196730Skib ks_ce = kstack_cache; 333196730Skib kstack_cache = ks_ce->next_ks_entry; 334196730Skib mtx_unlock(&kstack_cache_mtx); 335196730Skib 336196730Skib td->td_kstack_obj = ks_ce->ksobj; 337196730Skib td->td_kstack = (vm_offset_t)ks_ce; 338196730Skib td->td_kstack_pages = KSTACK_PAGES; 339196730Skib return (1); 340196730Skib } 341196730Skib mtx_unlock(&kstack_cache_mtx); 342196730Skib } 343196730Skib 344116355Salc /* 345116355Salc * Allocate an object for the kstack. 346116355Salc */ 347116355Salc ksobj = vm_object_allocate(OBJT_DEFAULT, pages); 348177368Sjeff 349116355Salc /* 350116355Salc * Get a kernel virtual address for this thread's kstack. 351116355Salc */ 352206819Sjmallett#if defined(__mips__) 353206819Sjmallett /* 354206819Sjmallett * We need to align the kstack's mapped address to fit within 355206819Sjmallett * a single TLB entry. 356206819Sjmallett */ 357206819Sjmallett ks = kmem_alloc_nofault_space(kernel_map, 358206819Sjmallett (pages + KSTACK_GUARD_PAGES) * PAGE_SIZE, VMFS_TLB_ALIGNED_SPACE); 359206819Sjmallett#else 360116355Salc ks = kmem_alloc_nofault(kernel_map, 361116355Salc (pages + KSTACK_GUARD_PAGES) * PAGE_SIZE); 362206819Sjmallett#endif 363173361Skib if (ks == 0) { 364173361Skib printf("vm_thread_new: kstack allocation failed\n"); 365173361Skib vm_object_deallocate(ksobj); 366173361Skib return (0); 367173361Skib } 368196730Skib 369196730Skib atomic_add_int(&kstacks, 1); 370116355Salc if (KSTACK_GUARD_PAGES != 0) { 371116355Salc pmap_qremove(ks, KSTACK_GUARD_PAGES); 372116355Salc ks += KSTACK_GUARD_PAGES * PAGE_SIZE; 373116355Salc } 374173361Skib td->td_kstack_obj = ksobj; 375116355Salc td->td_kstack = ks; 376116355Salc /* 377116355Salc * Knowing the number of pages allocated is useful when you 378116355Salc * want to deallocate them. 379116355Salc */ 380116355Salc td->td_kstack_pages = pages; 381116355Salc /* 382116355Salc * For the length of the stack, link in a real page of ram for each 383116355Salc * page of stack. 384116355Salc */ 385116355Salc VM_OBJECT_LOCK(ksobj); 386116355Salc for (i = 0; i < pages; i++) { 387116355Salc /* 388116355Salc * Get a kernel stack page. 389116355Salc */ 390136923Salc m = vm_page_grab(ksobj, i, VM_ALLOC_NOBUSY | 391116355Salc VM_ALLOC_NORMAL | VM_ALLOC_RETRY | VM_ALLOC_WIRED); 392116355Salc ma[i] = m; 393116355Salc m->valid = VM_PAGE_BITS_ALL; 394116355Salc } 395116355Salc VM_OBJECT_UNLOCK(ksobj); 396116355Salc pmap_qenter(ks, ma, pages); 397173361Skib return (1); 398116355Salc} 399116355Salc 400196730Skibstatic void 401196730Skibvm_thread_stack_dispose(vm_object_t ksobj, vm_offset_t ks, int pages) 402116355Salc{ 403116355Salc vm_page_t m; 404196730Skib int i; 405116355Salc 406196730Skib atomic_add_int(&kstacks, -1); 407116355Salc pmap_qremove(ks, pages); 408116355Salc VM_OBJECT_LOCK(ksobj); 409116355Salc for (i = 0; i < pages; i++) { 410116355Salc m = vm_page_lookup(ksobj, i); 411116355Salc if (m == NULL) 412116355Salc panic("vm_thread_dispose: kstack already missing?"); 413207410Skmacy vm_page_lock(m); 414116355Salc vm_page_unwire(m, 0); 415116355Salc vm_page_free(m); 416207410Skmacy vm_page_unlock(m); 417116355Salc } 418116355Salc VM_OBJECT_UNLOCK(ksobj); 419116355Salc vm_object_deallocate(ksobj); 420116355Salc kmem_free(kernel_map, ks - (KSTACK_GUARD_PAGES * PAGE_SIZE), 421116355Salc (pages + KSTACK_GUARD_PAGES) * PAGE_SIZE); 422196730Skib} 423196730Skib 424196730Skib/* 425196730Skib * Dispose of a thread's kernel stack. 426196730Skib */ 427196730Skibvoid 428196730Skibvm_thread_dispose(struct thread *td) 429196730Skib{ 430196730Skib vm_object_t ksobj; 431196730Skib vm_offset_t ks; 432196730Skib struct kstack_cache_entry *ks_ce; 433196730Skib int pages; 434196730Skib 435196730Skib pages = td->td_kstack_pages; 436196730Skib ksobj = td->td_kstack_obj; 437196730Skib ks = td->td_kstack; 438173361Skib td->td_kstack = 0; 439196730Skib td->td_kstack_pages = 0; 440196730Skib if (pages == KSTACK_PAGES && kstacks <= kstack_cache_size) { 441196730Skib ks_ce = (struct kstack_cache_entry *)ks; 442196730Skib ks_ce->ksobj = ksobj; 443196730Skib mtx_lock(&kstack_cache_mtx); 444196730Skib ks_ce->next_ks_entry = kstack_cache; 445196730Skib kstack_cache = ks_ce; 446196730Skib mtx_unlock(&kstack_cache_mtx); 447196730Skib return; 448196730Skib } 449196730Skib vm_thread_stack_dispose(ksobj, ks, pages); 450116355Salc} 451116355Salc 452196730Skibstatic void 453196730Skibvm_thread_stack_lowmem(void *nulll) 454196730Skib{ 455196730Skib struct kstack_cache_entry *ks_ce, *ks_ce1; 456196730Skib 457196730Skib mtx_lock(&kstack_cache_mtx); 458196730Skib ks_ce = kstack_cache; 459196730Skib kstack_cache = NULL; 460196730Skib mtx_unlock(&kstack_cache_mtx); 461196730Skib 462196730Skib while (ks_ce != NULL) { 463196730Skib ks_ce1 = ks_ce; 464196730Skib ks_ce = ks_ce->next_ks_entry; 465196730Skib 466196730Skib vm_thread_stack_dispose(ks_ce1->ksobj, (vm_offset_t)ks_ce1, 467196730Skib KSTACK_PAGES); 468196730Skib } 469196730Skib} 470196730Skib 471196730Skibstatic void 472196730Skibkstack_cache_init(void *nulll) 473196730Skib{ 474196730Skib 475196730Skib EVENTHANDLER_REGISTER(vm_lowmem, vm_thread_stack_lowmem, NULL, 476196730Skib EVENTHANDLER_PRI_ANY); 477196730Skib} 478196730Skib 479196730SkibMTX_SYSINIT(kstack_cache, &kstack_cache_mtx, "kstkch", MTX_DEF); 480196730SkibSYSINIT(vm_kstacks, SI_SUB_KTHREAD_INIT, SI_ORDER_ANY, kstack_cache_init, NULL); 481196730Skib 482206483Salc#ifndef NO_SWAPPING 483116355Salc/* 484116355Salc * Allow a thread's kernel stack to be paged out. 485116355Salc */ 486206483Salcstatic void 487116355Salcvm_thread_swapout(struct thread *td) 488116355Salc{ 489116355Salc vm_object_t ksobj; 490116355Salc vm_page_t m; 491116355Salc int i, pages; 492116355Salc 493119004Smarcel cpu_thread_swapout(td); 494116355Salc pages = td->td_kstack_pages; 495116355Salc ksobj = td->td_kstack_obj; 496116355Salc pmap_qremove(td->td_kstack, pages); 497116355Salc VM_OBJECT_LOCK(ksobj); 498116355Salc for (i = 0; i < pages; i++) { 499116355Salc m = vm_page_lookup(ksobj, i); 500116355Salc if (m == NULL) 501116355Salc panic("vm_thread_swapout: kstack already missing?"); 502206823Salc vm_page_dirty(m); 503207410Skmacy vm_page_lock(m); 504116355Salc vm_page_unwire(m, 0); 505207410Skmacy vm_page_unlock(m); 506116355Salc } 507116355Salc VM_OBJECT_UNLOCK(ksobj); 508116355Salc} 509116355Salc 510116355Salc/* 511116355Salc * Bring the kernel stack for a specified thread back in. 512116355Salc */ 513206483Salcstatic void 514116355Salcvm_thread_swapin(struct thread *td) 515116355Salc{ 516116355Salc vm_object_t ksobj; 517207365Skib vm_page_t ma[KSTACK_MAX_PAGES]; 518207365Skib int i, j, k, pages, rv; 519116355Salc 520116355Salc pages = td->td_kstack_pages; 521116355Salc ksobj = td->td_kstack_obj; 522116355Salc VM_OBJECT_LOCK(ksobj); 523207365Skib for (i = 0; i < pages; i++) 524207365Skib ma[i] = vm_page_grab(ksobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY | 525207365Skib VM_ALLOC_WIRED); 526116355Salc for (i = 0; i < pages; i++) { 527207365Skib if (ma[i]->valid != VM_PAGE_BITS_ALL) { 528207365Skib KASSERT(ma[i]->oflags & VPO_BUSY, 529207365Skib ("lost busy 1")); 530207365Skib vm_object_pip_add(ksobj, 1); 531207365Skib for (j = i + 1; j < pages; j++) { 532207365Skib KASSERT(ma[j]->valid == VM_PAGE_BITS_ALL || 533207365Skib (ma[j]->oflags & VPO_BUSY), 534207365Skib ("lost busy 2")); 535207365Skib if (ma[j]->valid == VM_PAGE_BITS_ALL) 536207365Skib break; 537207365Skib } 538207365Skib rv = vm_pager_get_pages(ksobj, ma + i, j - i, 0); 539116355Salc if (rv != VM_PAGER_OK) 540207365Skib panic("vm_thread_swapin: cannot get kstack for proc: %d", 541207365Skib td->td_proc->p_pid); 542207365Skib vm_object_pip_wakeup(ksobj); 543207365Skib for (k = i; k < j; k++) 544207365Skib ma[k] = vm_page_lookup(ksobj, k); 545207365Skib vm_page_wakeup(ma[i]); 546207365Skib } else if (ma[i]->oflags & VPO_BUSY) 547207365Skib vm_page_wakeup(ma[i]); 548116355Salc } 549116355Salc VM_OBJECT_UNLOCK(ksobj); 550116355Salc pmap_qenter(td->td_kstack, ma, pages); 551119004Smarcel cpu_thread_swapin(td); 552116355Salc} 553206483Salc#endif /* !NO_SWAPPING */ 554116355Salc 555116355Salc/* 5561541Srgrimes * Implement fork's actions on an address space. 5571541Srgrimes * Here we arrange for the address space to be copied or referenced, 5581541Srgrimes * allocate a user struct (pcb and kernel stack), then call the 5591541Srgrimes * machine-dependent layer to fill those in and make the new process 56024691Speter * ready to run. The new process is set up so that it returns directly 56124691Speter * to user mode to avoid stack copying and relocation problems. 5621541Srgrimes */ 563173361Skibint 564173361Skibvm_forkproc(td, p2, td2, vm2, flags) 56583366Sjulian struct thread *td; 56683366Sjulian struct proc *p2; 56790361Sjulian struct thread *td2; 568173361Skib struct vmspace *vm2; 56924691Speter int flags; 5701541Srgrimes{ 57183366Sjulian struct proc *p1 = td->td_proc; 572173361Skib int error; 5731541Srgrimes 57454188Sluoqi if ((flags & RFPROC) == 0) { 57554188Sluoqi /* 57654188Sluoqi * Divorce the memory, if it is shared, essentially 57754188Sluoqi * this changes shared memory amongst threads, into 57854188Sluoqi * COW locally. 57954188Sluoqi */ 58054188Sluoqi if ((flags & RFMEM) == 0) { 58154188Sluoqi if (p1->p_vmspace->vm_refcnt > 1) { 582173361Skib error = vmspace_unshare(p1); 583173361Skib if (error) 584173361Skib return (error); 58554188Sluoqi } 58654188Sluoqi } 58790361Sjulian cpu_fork(td, p2, td2, flags); 588173361Skib return (0); 58954188Sluoqi } 59054188Sluoqi 59124848Sdyson if (flags & RFMEM) { 59224848Sdyson p2->p_vmspace = p1->p_vmspace; 593132684Salc atomic_add_int(&p1->p_vmspace->vm_refcnt, 1); 59424848Sdyson } 59524848Sdyson 59651337Sdillon while (vm_page_count_severe()) { 5971549Srgrimes VM_WAIT; 5985455Sdg } 5991549Srgrimes 60024848Sdyson if ((flags & RFMEM) == 0) { 601173361Skib p2->p_vmspace = vm2; 60224691Speter if (p1->p_vmspace->vm_shm) 60324691Speter shmfork(p1, p2); 60424691Speter } 6051541Srgrimes 60615018Sdyson /* 60724691Speter * cpu_fork will copy and update the pcb, set up the kernel stack, 60824691Speter * and make the child ready to run. 6091541Srgrimes */ 61090361Sjulian cpu_fork(td, p2, td2, flags); 611173361Skib return (0); 6121541Srgrimes} 6131541Srgrimes 6141541Srgrimes/* 61583276Speter * Called after process has been wait(2)'ed apon and is being reaped. 61683276Speter * The idea is to reclaim resources that we could not reclaim while 61783276Speter * the process was still executing. 61883276Speter */ 61983276Spetervoid 62083276Spetervm_waitproc(p) 62183276Speter struct proc *p; 62283276Speter{ 62383276Speter 62490263Salfred vmspace_exitfree(p); /* and clean-out the vmspace */ 62583276Speter} 62683276Speter 6271549Srgrimesvoid 6281549Srgrimesfaultin(p) 6295455Sdg struct proc *p; 6301549Srgrimes{ 631113918Sjhb#ifdef NO_SWAPPING 632113918Sjhb 633113918Sjhb PROC_LOCK_ASSERT(p, MA_OWNED); 634172207Sjeff if ((p->p_flag & P_INMEM) == 0) 635113918Sjhb panic("faultin: proc swapped out with NO_SWAPPING!"); 636113918Sjhb#else /* !NO_SWAPPING */ 637113867Sjhb struct thread *td; 63899559Speter 63976641Sjhb PROC_LOCK_ASSERT(p, MA_OWNED); 640113867Sjhb /* 641113867Sjhb * If another process is swapping in this process, 642113867Sjhb * just wait until it finishes. 643113867Sjhb */ 644172207Sjeff if (p->p_flag & P_SWAPPINGIN) { 645172207Sjeff while (p->p_flag & P_SWAPPINGIN) 646172207Sjeff msleep(&p->p_flag, &p->p_mtx, PVM, "faultin", 0); 647172207Sjeff return; 648172207Sjeff } 649172207Sjeff if ((p->p_flag & P_INMEM) == 0) { 650100884Sjulian /* 651113867Sjhb * Don't let another thread swap process p out while we are 652113867Sjhb * busy swapping it in. 653100884Sjulian */ 654113867Sjhb ++p->p_lock; 655172207Sjeff p->p_flag |= P_SWAPPINGIN; 65671610Sjhb PROC_UNLOCK(p); 6571549Srgrimes 658172207Sjeff /* 659172207Sjeff * We hold no lock here because the list of threads 660172207Sjeff * can not change while all threads in the process are 661172207Sjeff * swapped out. 662172207Sjeff */ 663113867Sjhb FOREACH_THREAD_IN_PROC(p, td) 664116355Salc vm_thread_swapin(td); 66571610Sjhb PROC_LOCK(p); 666172207Sjeff swapclear(p); 667172268Sjeff p->p_swtick = ticks; 6681549Srgrimes 669172207Sjeff wakeup(&p->p_flag); 6701549Srgrimes 671113867Sjhb /* Allow other threads to swap p out now. */ 6721549Srgrimes --p->p_lock; 6731549Srgrimes } 674113918Sjhb#endif /* NO_SWAPPING */ 6755455Sdg} 6761549Srgrimes 6771541Srgrimes/* 6781549Srgrimes * This swapin algorithm attempts to swap-in processes only if there 6791549Srgrimes * is enough space for them. Of course, if a process waits for a long 6801549Srgrimes * time, it will be swapped in anyway. 68165557Sjasone * 682146501Salc * Giant is held on entry. 6831541Srgrimes */ 684254692Savgvoid 685254692Savgswapper(void) 6861541Srgrimes{ 68779242Sdillon struct proc *p; 68899072Sjulian struct thread *td; 6891541Srgrimes struct proc *pp; 690172268Sjeff int slptime; 691172268Sjeff int swtime; 6921541Srgrimes int ppri; 693172268Sjeff int pri; 6941541Srgrimes 6951541Srgrimesloop: 69651337Sdillon if (vm_page_count_min()) { 6975455Sdg VM_WAIT; 69851337Sdillon goto loop; 6995455Sdg } 7001549Srgrimes 7011541Srgrimes pp = NULL; 7021541Srgrimes ppri = INT_MIN; 70374927Sjhb sx_slock(&allproc_lock); 70483366Sjulian FOREACH_PROC_IN_SYSTEM(p) { 705172207Sjeff PROC_LOCK(p); 706220390Sjhb if (p->p_state == PRS_NEW || 707220390Sjhb p->p_flag & (P_SWAPPINGOUT | P_SWAPPINGIN | P_INMEM)) { 708172207Sjeff PROC_UNLOCK(p); 70999072Sjulian continue; 71099072Sjulian } 711172268Sjeff swtime = (ticks - p->p_swtick) / hz; 71299072Sjulian FOREACH_THREAD_IN_PROC(p, td) { 713100884Sjulian /* 714103216Sjulian * An otherwise runnable thread of a process 715103216Sjulian * swapped out has only the TDI_SWAPPED bit set. 716103216Sjulian * 717100884Sjulian */ 718170307Sjeff thread_lock(td); 719103216Sjulian if (td->td_inhibitors == TDI_SWAPPED) { 720172268Sjeff slptime = (ticks - td->td_slptick) / hz; 721172268Sjeff pri = swtime + slptime; 722172207Sjeff if ((td->td_flags & TDF_SWAPINREQ) == 0) 723130551Sjulian pri -= p->p_nice * 8; 72483366Sjulian /* 725164936Sjulian * if this thread is higher priority 72683366Sjulian * and there is enough space, then select 72783366Sjulian * this process instead of the previous 72883366Sjulian * selection. 72983366Sjulian */ 73083366Sjulian if (pri > ppri) { 73183366Sjulian pp = p; 73283366Sjulian ppri = pri; 73383366Sjulian } 73418974Sdyson } 735170307Sjeff thread_unlock(td); 7361541Srgrimes } 737172207Sjeff PROC_UNLOCK(p); 7381541Srgrimes } 73974927Sjhb sx_sunlock(&allproc_lock); 7401549Srgrimes 7411541Srgrimes /* 74218974Sdyson * Nothing to do, back to sleep. 7431541Srgrimes */ 7441541Srgrimes if ((p = pp) == NULL) { 745254692Savg tsleep(&proc0, PVM, "swapin", MAXSLP * hz / 2); 7461541Srgrimes goto loop; 7471541Srgrimes } 748100884Sjulian PROC_LOCK(p); 749100884Sjulian 750100884Sjulian /* 751100884Sjulian * Another process may be bringing or may have already 752100884Sjulian * brought this process in while we traverse all threads. 753100884Sjulian * Or, this process may even be being swapped out again. 754100884Sjulian */ 755172207Sjeff if (p->p_flag & (P_INMEM | P_SWAPPINGOUT | P_SWAPPINGIN)) { 756100884Sjulian PROC_UNLOCK(p); 757100884Sjulian goto loop; 758100884Sjulian } 759100884Sjulian 7601541Srgrimes /* 7611549Srgrimes * We would like to bring someone in. (only if there is space). 76299072Sjulian * [What checks the space? ] 7631541Srgrimes */ 7645455Sdg faultin(p); 76571610Sjhb PROC_UNLOCK(p); 7661541Srgrimes goto loop; 7671541Srgrimes} 7681541Srgrimes 769181334Sjhbvoid 770181334Sjhbkick_proc0(void) 771146554Sups{ 772146554Sups 773181334Sjhb wakeup(&proc0); 774146554Sups} 775146554Sups 77614178Sdg#ifndef NO_SWAPPING 77714178Sdg 7781541Srgrimes/* 77931563Sdyson * Swap_idle_threshold1 is the guaranteed swapped in time for a process 78031563Sdyson */ 78133181Seivindstatic int swap_idle_threshold1 = 2; 782113600StrhodesSYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold1, CTLFLAG_RW, 783113603Strhodes &swap_idle_threshold1, 0, "Guaranteed swapped in time for a process"); 78431563Sdyson 78531563Sdyson/* 78631563Sdyson * Swap_idle_threshold2 is the time that a process can be idle before 78731563Sdyson * it will be swapped out, if idle swapping is enabled. 78831563Sdyson */ 78933181Seivindstatic int swap_idle_threshold2 = 10; 790113600StrhodesSYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold2, CTLFLAG_RW, 791113603Strhodes &swap_idle_threshold2, 0, "Time before a process will be swapped out"); 79231563Sdyson 79331563Sdyson/* 794217192Skib * First, if any processes have been sleeping or stopped for at least 795217192Skib * "swap_idle_threshold1" seconds, they are swapped out. If, however, 796217192Skib * no such processes exist, then the longest-sleeping or stopped 797217192Skib * process is swapped out. Finally, and only as a last resort, if 798217192Skib * there are no sleeping or stopped processes, the longest-resident 799217192Skib * process is swapped out. 8001541Srgrimes */ 8011541Srgrimesvoid 80231667Sdysonswapout_procs(action) 80331667Sdysonint action; 8041541Srgrimes{ 80579242Sdillon struct proc *p; 80699072Sjulian struct thread *td; 8071541Srgrimes int didswap = 0; 8081541Srgrimes 80977089Sjhbretry: 81074927Sjhb sx_slock(&allproc_lock); 81199072Sjulian FOREACH_PROC_IN_SYSTEM(p) { 81215809Sdyson struct vmspace *vm; 81383366Sjulian int minslptime = 100000; 814172268Sjeff int slptime; 81571570Sjhb 816100913Stanimura /* 817103123Stanimura * Watch out for a process in 818103123Stanimura * creation. It may have no 819105695Sjhb * address space or lock yet. 820105695Sjhb */ 821172207Sjeff if (p->p_state == PRS_NEW) 822105695Sjhb continue; 823105695Sjhb /* 824103123Stanimura * An aio daemon switches its 825103123Stanimura * address space while running. 826103123Stanimura * Perform a quick check whether 827103123Stanimura * a process has P_SYSTEM. 828100913Stanimura */ 829114030Sjhb if ((p->p_flag & P_SYSTEM) != 0) 830103123Stanimura continue; 831105695Sjhb /* 832105695Sjhb * Do not swapout a process that 833105695Sjhb * is waiting for VM data 834105695Sjhb * structures as there is a possible 835105695Sjhb * deadlock. Test this first as 836105695Sjhb * this may block. 837105695Sjhb * 838105695Sjhb * Lock the map until swapout 839105695Sjhb * finishes, or a thread of this 840105695Sjhb * process may attempt to alter 841105695Sjhb * the map. 842105695Sjhb */ 843159054Stegge vm = vmspace_acquire_ref(p); 844159054Stegge if (vm == NULL) 845159054Stegge continue; 846100913Stanimura if (!vm_map_trylock(&vm->vm_map)) 847100913Stanimura goto nextproc1; 848100913Stanimura 84971570Sjhb PROC_LOCK(p); 85071574Sjhb if (p->p_lock != 0 || 851102950Sdavidxu (p->p_flag & (P_STOPPED_SINGLE|P_TRACED|P_SYSTEM|P_WEXIT) 852102950Sdavidxu ) != 0) { 853177368Sjeff goto nextproc; 85471570Sjhb } 85576827Salfred /* 85676827Salfred * only aiod changes vmspace, however it will be 85776827Salfred * skipped because of the if statement above checking 85876827Salfred * for P_SYSTEM 85976827Salfred */ 860172207Sjeff if ((p->p_flag & (P_INMEM|P_SWAPPINGOUT|P_SWAPPINGIN)) != P_INMEM) 861177368Sjeff goto nextproc; 862113867Sjhb 86399072Sjulian switch (p->p_state) { 8645455Sdg default: 86599072Sjulian /* Don't swap out processes in any sort 86699072Sjulian * of 'special' state. */ 867114030Sjhb break; 8685455Sdg 86999072Sjulian case PRS_NORMAL: 8701549Srgrimes /* 8715455Sdg * do not swapout a realtime process 87283366Sjulian * Check all the thread groups.. 8735455Sdg */ 874163709Sjb FOREACH_THREAD_IN_PROC(p, td) { 875172207Sjeff thread_lock(td); 876172207Sjeff if (PRI_IS_REALTIME(td->td_pri_class)) { 877172207Sjeff thread_unlock(td); 87883366Sjulian goto nextproc; 879172207Sjeff } 880172268Sjeff slptime = (ticks - td->td_slptick) / hz; 88183366Sjulian /* 882100913Stanimura * Guarantee swap_idle_threshold1 88383366Sjulian * time in memory. 88483366Sjulian */ 885172268Sjeff if (slptime < swap_idle_threshold1) { 886172207Sjeff thread_unlock(td); 88783366Sjulian goto nextproc; 888172207Sjeff } 889100913Stanimura 890100884Sjulian /* 891100913Stanimura * Do not swapout a process if it is 892100913Stanimura * waiting on a critical event of some 893100913Stanimura * kind or there is a thread whose 894100913Stanimura * pageable memory may be accessed. 895100884Sjulian * 896100884Sjulian * This could be refined to support 897100884Sjulian * swapping out a thread. 898100884Sjulian */ 899177085Sjeff if (!thread_safetoswapout(td)) { 900172207Sjeff thread_unlock(td); 901163709Sjb goto nextproc; 902172207Sjeff } 90383366Sjulian /* 90483366Sjulian * If the system is under memory stress, 90583366Sjulian * or if we are swapping 90683366Sjulian * idle processes >= swap_idle_threshold2, 90783366Sjulian * then swap the process out. 90883366Sjulian */ 90983366Sjulian if (((action & VM_SWAP_NORMAL) == 0) && 91083366Sjulian (((action & VM_SWAP_IDLE) == 0) || 911172268Sjeff (slptime < swap_idle_threshold2))) { 912172207Sjeff thread_unlock(td); 91383366Sjulian goto nextproc; 914172207Sjeff } 915100913Stanimura 916172268Sjeff if (minslptime > slptime) 917172268Sjeff minslptime = slptime; 918172207Sjeff thread_unlock(td); 91969509Sjhb } 9205455Sdg 9215455Sdg /* 922131163Sdas * If the pageout daemon didn't free enough pages, 923131163Sdas * or if this process is idle and the system is 924131163Sdas * configured to swap proactively, swap it out. 9252692Sdg */ 92631563Sdyson if ((action & VM_SWAP_NORMAL) || 92731563Sdyson ((action & VM_SWAP_IDLE) && 92883366Sjulian (minslptime > swap_idle_threshold2))) { 929172207Sjeff if (swapout(p) == 0) 930172207Sjeff didswap++; 931113867Sjhb PROC_UNLOCK(p); 932100913Stanimura vm_map_unlock(&vm->vm_map); 93331563Sdyson vmspace_free(vm); 934100913Stanimura sx_sunlock(&allproc_lock); 93531563Sdyson goto retry; 93676641Sjhb } 9371541Srgrimes } 938177368Sjeffnextproc: 939100913Stanimura PROC_UNLOCK(p); 940100913Stanimura vm_map_unlock(&vm->vm_map); 941100913Stanimuranextproc1: 942100913Stanimura vmspace_free(vm); 94392666Speter continue; 9441541Srgrimes } 94574927Sjhb sx_sunlock(&allproc_lock); 9461541Srgrimes /* 9471549Srgrimes * If we swapped something out, and another process needed memory, 9481549Srgrimes * then wakeup the sched process. 9491549Srgrimes */ 9505455Sdg if (didswap) 9519507Sdg wakeup(&proc0); 9521541Srgrimes} 9531541Srgrimes 95412820Sphkstatic void 955172207Sjeffswapclear(p) 956172207Sjeff struct proc *p; 957172207Sjeff{ 958172207Sjeff struct thread *td; 959172207Sjeff 960172207Sjeff PROC_LOCK_ASSERT(p, MA_OWNED); 961172207Sjeff 962172207Sjeff FOREACH_THREAD_IN_PROC(p, td) { 963172207Sjeff thread_lock(td); 964172207Sjeff td->td_flags |= TDF_INMEM; 965172207Sjeff td->td_flags &= ~TDF_SWAPINREQ; 966172207Sjeff TD_CLR_SWAPPED(td); 967172207Sjeff if (TD_CAN_RUN(td)) 968181334Sjhb if (setrunnable(td)) { 969181334Sjhb#ifdef INVARIANTS 970181334Sjhb /* 971181334Sjhb * XXX: We just cleared TDI_SWAPPED 972181334Sjhb * above and set TDF_INMEM, so this 973181334Sjhb * should never happen. 974181334Sjhb */ 975181334Sjhb panic("not waking up swapper"); 976181334Sjhb#endif 977181334Sjhb } 978172207Sjeff thread_unlock(td); 979172207Sjeff } 980172207Sjeff p->p_flag &= ~(P_SWAPPINGIN|P_SWAPPINGOUT); 981172207Sjeff p->p_flag |= P_INMEM; 982172207Sjeff} 983172207Sjeff 984172207Sjeffstatic int 9851541Srgrimesswapout(p) 98679242Sdillon struct proc *p; 9871541Srgrimes{ 98883366Sjulian struct thread *td; 9891541Srgrimes 99076778Sjhb PROC_LOCK_ASSERT(p, MA_OWNED); 99115153Sdyson#if defined(SWAP_DEBUG) 99215153Sdyson printf("swapping out %d\n", p->p_pid); 99315153Sdyson#endif 994100884Sjulian 995100884Sjulian /* 996100913Stanimura * The states of this process and its threads may have changed 997100913Stanimura * by now. Assuming that there is only one pageout daemon thread, 998100913Stanimura * this process should still be in memory. 999100913Stanimura */ 1000172207Sjeff KASSERT((p->p_flag & (P_INMEM|P_SWAPPINGOUT|P_SWAPPINGIN)) == P_INMEM, 1001100913Stanimura ("swapout: lost a swapout race?")); 1002100913Stanimura 1003100913Stanimura /* 1004172207Sjeff * remember the process resident count 1005100884Sjulian */ 1006172207Sjeff p->p_vmspace->vm_swrss = vmspace_resident_count(p->p_vmspace); 10071541Srgrimes /* 1008172207Sjeff * Check and mark all threads before we proceed. 10091541Srgrimes */ 1010172207Sjeff p->p_flag &= ~P_INMEM; 1011172207Sjeff p->p_flag |= P_SWAPPINGOUT; 1012170307Sjeff FOREACH_THREAD_IN_PROC(p, td) { 1013170307Sjeff thread_lock(td); 1014172207Sjeff if (!thread_safetoswapout(td)) { 1015172207Sjeff thread_unlock(td); 1016172207Sjeff swapclear(p); 1017172207Sjeff return (EBUSY); 1018172207Sjeff } 1019172207Sjeff td->td_flags &= ~TDF_INMEM; 1020113867Sjhb TD_SET_SWAPPED(td); 1021170307Sjeff thread_unlock(td); 1022170307Sjeff } 1023172207Sjeff td = FIRST_THREAD_IN_PROC(p); 1024172207Sjeff ++td->td_ru.ru_nswap; 1025172207Sjeff PROC_UNLOCK(p); 10261549Srgrimes 1027172207Sjeff /* 1028172207Sjeff * This list is stable because all threads are now prevented from 1029172207Sjeff * running. The list is only modified in the context of a running 1030172207Sjeff * thread in this process. 1031172207Sjeff */ 1032113867Sjhb FOREACH_THREAD_IN_PROC(p, td) 1033116355Salc vm_thread_swapout(td); 1034113867Sjhb 1035113867Sjhb PROC_LOCK(p); 1036172207Sjeff p->p_flag &= ~P_SWAPPINGOUT; 1037172268Sjeff p->p_swtick = ticks; 1038172207Sjeff return (0); 10391541Srgrimes} 104014178Sdg#endif /* !NO_SWAPPING */ 1041