Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_contig.c
Version:
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1 /*- 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * The Mach Operating System project at Carnegie-Mellon University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91 33 */ 34 35 /*- 36 * Copyright (c) 1987, 1990 Carnegie-Mellon University. 37 * All rights reserved. 38 * 39 * Authors: Avadis Tevanian, Jr., Michael Wayne Young 40 * 41 * Permission to use, copy, modify and distribute this software and 42 * its documentation is hereby granted, provided that both the copyright 43 * notice and this permission notice appear in all copies of the 44 * software, derivative works or modified versions, and any portions 45 * thereof, and that both notices appear in supporting documentation. 46 * 47 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 48 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 49 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 50 * 51 * Carnegie Mellon requests users of this software to return to 52 * 53 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 54 * School of Computer Science 55 * Carnegie Mellon University 56 * Pittsburgh PA 15213-3890 57 * 58 * any improvements or extensions that they make and grant Carnegie the 59 * rights to redistribute these changes. 60 */ 61 62 #include <sys/cdefs.h> 63 __FBSDID("$FreeBSD: releng/8.2/sys/vm/vm_contig.c 215938 2010-11-27 12:26:40Z jchandra $"); 64 65 #include <sys/param.h> 66 #include <sys/systm.h> 67 #include <sys/lock.h> 68 #include <sys/malloc.h> 69 #include <sys/mount.h> 70 #include <sys/mutex.h> 71 #include <sys/proc.h> 72 #include <sys/kernel.h> 73 #include <sys/linker_set.h> 74 #include <sys/sysctl.h> 75 #include <sys/vmmeter.h> 76 #include <sys/vnode.h> 77 78 #include <vm/vm.h> 79 #include <vm/vm_param.h> 80 #include <vm/vm_kern.h> 81 #include <vm/pmap.h> 82 #include <vm/vm_map.h> 83 #include <vm/vm_object.h> 84 #include <vm/vm_page.h> 85 #include <vm/vm_pageout.h> 86 #include <vm/vm_pager.h> 87 #include <vm/vm_phys.h> 88 #include <vm/vm_extern.h> 89 90 static int 91 vm_contig_launder_page(vm_page_t m, vm_page_t *next) 92 { 93 vm_object_t object; 94 vm_page_t m_tmp; 95 struct vnode *vp; 96 struct mount *mp; 97 int vfslocked; 98 99 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 100 object = m->object; 101 if (!VM_OBJECT_TRYLOCK(object) && 102 !vm_pageout_fallback_object_lock(m, next)) { 103 VM_OBJECT_UNLOCK(object); 104 return (EAGAIN); 105 } 106 if (vm_page_sleep_if_busy(m, TRUE, "vpctw0")) { 107 VM_OBJECT_UNLOCK(object); 108 vm_page_lock_queues(); 109 return (EBUSY); 110 } 111 vm_page_test_dirty(m); 112 if (m->dirty == 0 && m->hold_count == 0) 113 pmap_remove_all(m); 114 if (m->dirty) { 115 if ((object->flags & OBJ_DEAD) != 0) { 116 VM_OBJECT_UNLOCK(object); 117 return (EAGAIN); 118 } 119 if (object->type == OBJT_VNODE) { 120 vm_page_unlock_queues(); 121 vp = object->handle; 122 vm_object_reference_locked(object); 123 VM_OBJECT_UNLOCK(object); 124 (void) vn_start_write(vp, &mp, V_WAIT); 125 vfslocked = VFS_LOCK_GIANT(vp->v_mount); 126 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 127 VM_OBJECT_LOCK(object); 128 vm_object_page_clean(object, 0, 0, OBJPC_SYNC); 129 VM_OBJECT_UNLOCK(object); 130 VOP_UNLOCK(vp, 0); 131 VFS_UNLOCK_GIANT(vfslocked); 132 vm_object_deallocate(object); 133 vn_finished_write(mp); 134 vm_page_lock_queues(); 135 return (0); 136 } else if (object->type == OBJT_SWAP || 137 object->type == OBJT_DEFAULT) { 138 m_tmp = m; 139 vm_pageout_flush(&m_tmp, 1, VM_PAGER_PUT_SYNC, 0, NULL); 140 VM_OBJECT_UNLOCK(object); 141 return (0); 142 } 143 } else if (m->hold_count == 0) 144 vm_page_cache(m); 145 VM_OBJECT_UNLOCK(object); 146 return (0); 147 } 148 149 static int 150 vm_contig_launder(int queue, vm_paddr_t low, vm_paddr_t high) 151 { 152 vm_page_t m, next; 153 vm_paddr_t pa; 154 int error; 155 156 TAILQ_FOREACH_SAFE(m, &vm_page_queues[queue].pl, pageq, next) { 157 158 /* Skip marker pages */ 159 if ((m->flags & PG_MARKER) != 0) 160 continue; 161 162 pa = VM_PAGE_TO_PHYS(m); 163 if (pa < low || pa + PAGE_SIZE > high) 164 continue; 165 166 KASSERT(VM_PAGE_INQUEUE2(m, queue), 167 ("vm_contig_launder: page %p's queue is not %d", m, queue)); 168 error = vm_contig_launder_page(m, &next); 169 if (error == 0) 170 return (TRUE); 171 if (error == EBUSY) 172 return (FALSE); 173 } 174 return (FALSE); 175 } 176 177 /* 178 * Frees the given physically contiguous pages. 179 * 180 * N.B.: Any pages with PG_ZERO set must, in fact, be zero filled. 181 */ 182 static void 183 vm_page_release_contig(vm_page_t m, vm_pindex_t count) 184 { 185 186 while (count--) { 187 /* Leave PG_ZERO unchanged. */ 188 vm_page_free_toq(m); 189 m++; 190 } 191 } 192 193 /* 194 * Increase the number of cached pages. 195 */ 196 void 197 vm_contig_grow_cache(int tries, vm_paddr_t low, vm_paddr_t high) 198 { 199 int actl, actmax, inactl, inactmax; 200 201 vm_page_lock_queues(); 202 inactl = 0; 203 inactmax = tries < 1 ? 0 : cnt.v_inactive_count; 204 actl = 0; 205 actmax = tries < 2 ? 0 : cnt.v_active_count; 206 again: 207 if (inactl < inactmax && vm_contig_launder(PQ_INACTIVE, low, high)) { 208 inactl++; 209 goto again; 210 } 211 if (actl < actmax && vm_contig_launder(PQ_ACTIVE, low, high)) { 212 actl++; 213 goto again; 214 } 215 vm_page_unlock_queues(); 216 } 217 218 /* 219 * Allocates a region from the kernel address map and pages within the 220 * specified physical address range to the kernel object, creates a wired 221 * mapping from the region to these pages, and returns the region's starting 222 * virtual address. The allocated pages are not necessarily physically 223 * contiguous. If M_ZERO is specified through the given flags, then the pages 224 * are zeroed before they are mapped. 225 */ 226 vm_offset_t 227 kmem_alloc_attr(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low, 228 vm_paddr_t high, vm_memattr_t memattr) 229 { 230 vm_object_t object = kernel_object; 231 vm_offset_t addr, i, offset; 232 vm_page_t m; 233 int tries; 234 235 size = round_page(size); 236 vm_map_lock(map); 237 if (vm_map_findspace(map, vm_map_min(map), size, &addr)) { 238 vm_map_unlock(map); 239 return (0); 240 } 241 offset = addr - VM_MIN_KERNEL_ADDRESS; 242 vm_object_reference(object); 243 vm_map_insert(map, object, offset, addr, addr + size, VM_PROT_ALL, 244 VM_PROT_ALL, 0); 245 VM_OBJECT_LOCK(object); 246 for (i = 0; i < size; i += PAGE_SIZE) { 247 tries = 0; 248 retry: 249 m = vm_phys_alloc_contig(1, low, high, PAGE_SIZE, 0); 250 if (m == NULL) { 251 if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) { 252 VM_OBJECT_UNLOCK(object); 253 vm_map_unlock(map); 254 vm_contig_grow_cache(tries, low, high); 255 vm_map_lock(map); 256 VM_OBJECT_LOCK(object); 257 goto retry; 258 } 259 while (i != 0) { 260 i -= PAGE_SIZE; 261 m = vm_page_lookup(object, OFF_TO_IDX(offset + 262 i)); 263 vm_page_lock_queues(); 264 vm_page_free(m); 265 vm_page_unlock_queues(); 266 } 267 VM_OBJECT_UNLOCK(object); 268 vm_map_delete(map, addr, addr + size); 269 vm_map_unlock(map); 270 return (0); 271 } 272 if (memattr != VM_MEMATTR_DEFAULT) 273 pmap_page_set_memattr(m, memattr); 274 vm_page_insert(m, object, OFF_TO_IDX(offset + i)); 275 if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0) 276 pmap_zero_page(m); 277 m->valid = VM_PAGE_BITS_ALL; 278 } 279 VM_OBJECT_UNLOCK(object); 280 vm_map_unlock(map); 281 vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM | 282 VM_MAP_WIRE_NOHOLES); 283 return (addr); 284 } 285 286 /* 287 * Allocates a region from the kernel address map, inserts the 288 * given physically contiguous pages into the kernel object, 289 * creates a wired mapping from the region to the pages, and 290 * returns the region's starting virtual address. If M_ZERO is 291 * specified through the given flags, then the pages are zeroed 292 * before they are mapped. 293 */ 294 static vm_offset_t 295 contigmapping(vm_map_t map, vm_size_t size, vm_page_t m, vm_memattr_t memattr, 296 int flags) 297 { 298 vm_object_t object = kernel_object; 299 vm_offset_t addr, tmp_addr; 300 301 vm_map_lock(map); 302 if (vm_map_findspace(map, vm_map_min(map), size, &addr)) { 303 vm_map_unlock(map); 304 return (0); 305 } 306 vm_object_reference(object); 307 vm_map_insert(map, object, addr - VM_MIN_KERNEL_ADDRESS, 308 addr, addr + size, VM_PROT_ALL, VM_PROT_ALL, 0); 309 vm_map_unlock(map); 310 VM_OBJECT_LOCK(object); 311 for (tmp_addr = addr; tmp_addr < addr + size; tmp_addr += PAGE_SIZE) { 312 if (memattr != VM_MEMATTR_DEFAULT) 313 pmap_page_set_memattr(m, memattr); 314 vm_page_insert(m, object, 315 OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS)); 316 if ((flags & M_ZERO) && (m->flags & PG_ZERO) == 0) 317 pmap_zero_page(m); 318 m->valid = VM_PAGE_BITS_ALL; 319 m++; 320 } 321 VM_OBJECT_UNLOCK(object); 322 vm_map_wire(map, addr, addr + size, 323 VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES); 324 return (addr); 325 } 326 327 void * 328 contigmalloc( 329 unsigned long size, /* should be size_t here and for malloc() */ 330 struct malloc_type *type, 331 int flags, 332 vm_paddr_t low, 333 vm_paddr_t high, 334 unsigned long alignment, 335 unsigned long boundary) 336 { 337 void *ret; 338 339 ret = (void *)kmem_alloc_contig(kernel_map, size, flags, low, high, 340 alignment, boundary, VM_MEMATTR_DEFAULT); 341 if (ret != NULL) 342 malloc_type_allocated(type, round_page(size)); 343 return (ret); 344 } 345 346 vm_offset_t 347 kmem_alloc_contig(vm_map_t map, vm_size_t size, int flags, vm_paddr_t low, 348 vm_paddr_t high, unsigned long alignment, unsigned long boundary, 349 vm_memattr_t memattr) 350 { 351 vm_offset_t ret; 352 vm_page_t pages; 353 unsigned long npgs; 354 int tries; 355 356 size = round_page(size); 357 npgs = size >> PAGE_SHIFT; 358 tries = 0; 359 retry: 360 pages = vm_phys_alloc_contig(npgs, low, high, alignment, boundary); 361 if (pages == NULL) { 362 if (tries < ((flags & M_NOWAIT) != 0 ? 1 : 3)) { 363 vm_contig_grow_cache(tries, low, high); 364 tries++; 365 goto retry; 366 } 367 ret = 0; 368 } else { 369 ret = contigmapping(map, size, pages, memattr, flags); 370 if (ret == 0) 371 vm_page_release_contig(pages, npgs); 372 } 373 return (ret); 374 } 375 376 void 377 contigfree(void *addr, unsigned long size, struct malloc_type *type) 378 { 379 380 kmem_free(kernel_map, (vm_offset_t)addr, size); 381 malloc_type_freed(type, round_page(size)); 382 }
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