The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 1 | /** |
| 2 | * @file daemon/opd_sfile.c |
| 3 | * Management of sample files |
| 4 | * |
| 5 | * @remark Copyright 2002, 2005 OProfile authors |
| 6 | * @remark Read the file COPYING |
| 7 | * |
| 8 | * @author John Levon |
| 9 | * @author Philippe Elie |
| 10 | */ |
| 11 | |
| 12 | #include "opd_sfile.h" |
| 13 | |
| 14 | #include "opd_trans.h" |
| 15 | #include "opd_kernel.h" |
| 16 | #include "opd_mangling.h" |
| 17 | #include "opd_anon.h" |
| 18 | #include "opd_printf.h" |
| 19 | #include "opd_stats.h" |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 20 | #include "opd_extended.h" |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 21 | #include "oprofiled.h" |
| 22 | |
| 23 | #include "op_libiberty.h" |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | |
| 29 | #define HASH_SIZE 2048 |
| 30 | #define HASH_BITS (HASH_SIZE - 1) |
| 31 | |
| 32 | /** All sfiles are hashed into these lists */ |
| 33 | static struct list_head hashes[HASH_SIZE]; |
| 34 | |
| 35 | /** All sfiles are on this list. */ |
| 36 | static LIST_HEAD(lru_list); |
| 37 | |
| 38 | |
| 39 | /* FIXME: can undoubtedly improve this hashing */ |
| 40 | /** Hash the transient parameters for lookup. */ |
| 41 | static unsigned long |
| 42 | sfile_hash(struct transient const * trans, struct kernel_image * ki) |
| 43 | { |
| 44 | unsigned long val = 0; |
| 45 | |
| 46 | if (separate_thread) { |
| 47 | val ^= trans->tid << 2; |
| 48 | val ^= trans->tgid << 2; |
| 49 | } |
| 50 | |
| 51 | if (separate_kernel || ((trans->anon || separate_lib) && !ki)) |
| 52 | val ^= trans->app_cookie >> (DCOOKIE_SHIFT + 3); |
| 53 | |
| 54 | if (separate_cpu) |
| 55 | val ^= trans->cpu; |
| 56 | |
| 57 | /* cookie meaningless for kernel, shouldn't hash */ |
| 58 | if (trans->in_kernel) { |
| 59 | val ^= ki->start >> 14; |
| 60 | val ^= ki->end >> 7; |
| 61 | return val & HASH_BITS; |
| 62 | } |
| 63 | |
| 64 | if (trans->cookie != NO_COOKIE) { |
| 65 | val ^= trans->cookie >> DCOOKIE_SHIFT; |
| 66 | return val & HASH_BITS; |
| 67 | } |
| 68 | |
| 69 | if (!separate_thread) |
| 70 | val ^= trans->tgid << 2; |
| 71 | |
| 72 | if (trans->anon) { |
| 73 | val ^= trans->anon->start >> VMA_SHIFT; |
| 74 | val ^= trans->anon->end >> (VMA_SHIFT + 1); |
| 75 | } |
| 76 | |
| 77 | return val & HASH_BITS; |
| 78 | } |
| 79 | |
| 80 | |
| 81 | static int |
| 82 | do_match(struct sfile const * sf, cookie_t cookie, cookie_t app_cookie, |
| 83 | struct kernel_image const * ki, struct anon_mapping const * anon, |
| 84 | pid_t tgid, pid_t tid, unsigned int cpu) |
| 85 | { |
| 86 | /* this is a simplified check for "is a kernel image" AND |
| 87 | * "is the right kernel image". Also handles no-vmlinux |
| 88 | * correctly. |
| 89 | */ |
| 90 | if (sf->kernel != ki) |
| 91 | return 0; |
| 92 | |
| 93 | if (separate_thread) { |
| 94 | if (sf->tid != tid || sf->tgid != tgid) |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | if (separate_cpu) { |
| 99 | if (sf->cpu != cpu) |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | if (separate_kernel || ((anon || separate_lib) && !ki)) { |
| 104 | if (sf->app_cookie != app_cookie) |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | /* ignore the cached trans->cookie for kernel images, |
| 109 | * it's meaningless and we checked all others already |
| 110 | */ |
| 111 | if (ki) |
| 112 | return 1; |
| 113 | |
| 114 | if (sf->anon != anon) |
| 115 | return 0; |
| 116 | |
| 117 | return sf->cookie == cookie; |
| 118 | } |
| 119 | |
| 120 | |
| 121 | static int |
| 122 | trans_match(struct transient const * trans, struct sfile const * sfile, |
| 123 | struct kernel_image const * ki) |
| 124 | { |
| 125 | return do_match(sfile, trans->cookie, trans->app_cookie, ki, |
| 126 | trans->anon, trans->tgid, trans->tid, trans->cpu); |
| 127 | } |
| 128 | |
| 129 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 130 | int |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 131 | sfile_equal(struct sfile const * sf, struct sfile const * sf2) |
| 132 | { |
| 133 | return do_match(sf, sf2->cookie, sf2->app_cookie, sf2->kernel, |
| 134 | sf2->anon, sf2->tgid, sf2->tid, sf2->cpu); |
| 135 | } |
| 136 | |
| 137 | |
| 138 | static int |
| 139 | is_sf_ignored(struct sfile const * sf) |
| 140 | { |
| 141 | if (sf->kernel) { |
| 142 | if (!is_image_ignored(sf->kernel->name)) |
| 143 | return 0; |
| 144 | |
| 145 | /* Let a dependent kernel image redeem the sf if we're |
| 146 | * executing on behalf of an application. |
| 147 | */ |
| 148 | return is_cookie_ignored(sf->app_cookie); |
| 149 | } |
| 150 | |
| 151 | /* Anon regions are always dependent on the application. |
| 152 | * Otherwise, let a dependent image redeem the sf. |
| 153 | */ |
| 154 | if (sf->anon || is_cookie_ignored(sf->cookie)) |
| 155 | return is_cookie_ignored(sf->app_cookie); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /** create a new sfile matching the current transient parameters */ |
| 162 | static struct sfile * |
| 163 | create_sfile(unsigned long hash, struct transient const * trans, |
| 164 | struct kernel_image * ki) |
| 165 | { |
| 166 | size_t i; |
| 167 | struct sfile * sf; |
| 168 | |
| 169 | sf = xmalloc(sizeof(struct sfile)); |
| 170 | |
| 171 | sf->hashval = hash; |
| 172 | |
| 173 | /* The logic here: if we're in the kernel, the cached cookie is |
| 174 | * meaningless (though not the app_cookie if separate_kernel) |
| 175 | */ |
| 176 | sf->cookie = trans->in_kernel ? INVALID_COOKIE : trans->cookie; |
| 177 | sf->app_cookie = INVALID_COOKIE; |
| 178 | sf->tid = (pid_t)-1; |
| 179 | sf->tgid = (pid_t)-1; |
| 180 | sf->cpu = 0; |
| 181 | sf->kernel = ki; |
| 182 | sf->anon = trans->anon; |
| 183 | |
| 184 | for (i = 0 ; i < op_nr_counters ; ++i) |
| 185 | odb_init(&sf->files[i]); |
| 186 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 187 | if (trans->ext) |
| 188 | opd_ext_sfile_create(sf); |
| 189 | else |
| 190 | sf->ext_files = NULL; |
| 191 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 192 | for (i = 0; i < CG_HASH_SIZE; ++i) |
| 193 | list_init(&sf->cg_hash[i]); |
| 194 | |
| 195 | if (separate_thread) |
| 196 | sf->tid = trans->tid; |
| 197 | if (separate_thread || trans->cookie == NO_COOKIE) |
| 198 | sf->tgid = trans->tgid; |
| 199 | |
| 200 | if (separate_cpu) |
| 201 | sf->cpu = trans->cpu; |
| 202 | |
| 203 | if (separate_kernel || ((trans->anon || separate_lib) && !ki)) |
| 204 | sf->app_cookie = trans->app_cookie; |
| 205 | |
| 206 | sf->ignored = is_sf_ignored(sf); |
| 207 | |
| 208 | sf->embedded_offset = trans->embedded_offset; |
| 209 | |
| 210 | /* If embedded_offset is a valid value, it means we're |
| 211 | * processing a Cell BE SPU profile; in which case, we |
| 212 | * want sf->app_cookie to hold trans->app_cookie. |
| 213 | */ |
| 214 | if (trans->embedded_offset != UNUSED_EMBEDDED_OFFSET) |
| 215 | sf->app_cookie = trans->app_cookie; |
| 216 | return sf; |
| 217 | } |
| 218 | |
| 219 | |
| 220 | struct sfile * sfile_find(struct transient const * trans) |
| 221 | { |
| 222 | struct sfile * sf; |
| 223 | struct list_head * pos; |
| 224 | struct kernel_image * ki = NULL; |
| 225 | unsigned long hash; |
| 226 | |
| 227 | if (trans->tracing != TRACING_ON) { |
| 228 | opd_stats[OPD_SAMPLES]++; |
| 229 | opd_stats[trans->in_kernel == 1 ? OPD_KERNEL : OPD_PROCESS]++; |
| 230 | } |
| 231 | |
| 232 | /* There is a small race where this *can* happen, see |
| 233 | * caller of cpu_buffer_reset() in the kernel |
| 234 | */ |
| 235 | if (trans->in_kernel == -1) { |
| 236 | verbprintf(vsamples, "Losing sample at 0x%llx of unknown provenance.\n", |
| 237 | trans->pc); |
| 238 | opd_stats[OPD_NO_CTX]++; |
| 239 | return NULL; |
| 240 | } |
| 241 | |
| 242 | /* we might need a kernel image start/end to hash on */ |
| 243 | if (trans->in_kernel) { |
| 244 | ki = find_kernel_image(trans); |
| 245 | if (!ki) { |
| 246 | verbprintf(vsamples, "Lost kernel sample %llx\n", trans->pc); |
| 247 | opd_stats[OPD_LOST_KERNEL]++; |
| 248 | return NULL; |
| 249 | } |
| 250 | } else if (trans->cookie == NO_COOKIE && !trans->anon) { |
| 251 | if (vsamples) { |
| 252 | char const * app = verbose_cookie(trans->app_cookie); |
| 253 | printf("No anon map for pc %llx, app %s.\n", |
| 254 | trans->pc, app); |
| 255 | } |
| 256 | opd_stats[OPD_LOST_NO_MAPPING]++; |
| 257 | return NULL; |
| 258 | } |
| 259 | |
| 260 | hash = sfile_hash(trans, ki); |
| 261 | list_for_each(pos, &hashes[hash]) { |
| 262 | sf = list_entry(pos, struct sfile, hash); |
| 263 | if (trans_match(trans, sf, ki)) { |
| 264 | sfile_get(sf); |
| 265 | goto lru; |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | sf = create_sfile(hash, trans, ki); |
| 270 | list_add(&sf->hash, &hashes[hash]); |
| 271 | |
| 272 | lru: |
| 273 | sfile_put(sf); |
| 274 | return sf; |
| 275 | } |
| 276 | |
| 277 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 278 | void sfile_dup(struct sfile * to, struct sfile * from) |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 279 | { |
| 280 | size_t i; |
| 281 | |
| 282 | memcpy(to, from, sizeof (struct sfile)); |
| 283 | |
| 284 | for (i = 0 ; i < op_nr_counters ; ++i) |
| 285 | odb_init(&to->files[i]); |
| 286 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 287 | opd_ext_sfile_dup(to, from); |
| 288 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 289 | for (i = 0; i < CG_HASH_SIZE; ++i) |
| 290 | list_init(&to->cg_hash[i]); |
| 291 | |
| 292 | list_init(&to->hash); |
| 293 | list_init(&to->lru); |
| 294 | } |
| 295 | |
| 296 | |
| 297 | static odb_t * get_file(struct transient const * trans, int is_cg) |
| 298 | { |
| 299 | struct sfile * sf = trans->current; |
| 300 | struct sfile * last = trans->last; |
| 301 | struct cg_entry * cg; |
| 302 | struct list_head * pos; |
| 303 | unsigned long hash; |
| 304 | odb_t * file; |
| 305 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 306 | if ((trans->ext) != NULL) |
| 307 | return opd_ext_sfile_get(trans, is_cg); |
| 308 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 309 | if (trans->event >= op_nr_counters) { |
| 310 | fprintf(stderr, "%s: Invalid counter %lu\n", __FUNCTION__, |
| 311 | trans->event); |
| 312 | abort(); |
| 313 | } |
| 314 | |
| 315 | file = &sf->files[trans->event]; |
| 316 | |
| 317 | if (!is_cg) |
| 318 | goto open; |
| 319 | |
| 320 | hash = last->hashval & (CG_HASH_SIZE - 1); |
| 321 | |
| 322 | /* Need to look for the right 'to'. Since we're looking for |
| 323 | * 'last', we use its hash. |
| 324 | */ |
| 325 | list_for_each(pos, &sf->cg_hash[hash]) { |
| 326 | cg = list_entry(pos, struct cg_entry, hash); |
| 327 | if (sfile_equal(last, &cg->to)) { |
| 328 | file = &cg->to.files[trans->event]; |
| 329 | goto open; |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | cg = xmalloc(sizeof(struct cg_entry)); |
| 334 | sfile_dup(&cg->to, last); |
| 335 | list_add(&cg->hash, &sf->cg_hash[hash]); |
| 336 | file = &cg->to.files[trans->event]; |
| 337 | |
| 338 | open: |
| 339 | if (!odb_open_count(file)) |
| 340 | opd_open_sample_file(file, last, sf, trans->event, is_cg); |
| 341 | |
| 342 | /* Error is logged by opd_open_sample_file */ |
| 343 | if (!odb_open_count(file)) |
| 344 | return NULL; |
| 345 | |
| 346 | return file; |
| 347 | } |
| 348 | |
| 349 | |
| 350 | static void verbose_print_sample(struct sfile * sf, vma_t pc, uint counter) |
| 351 | { |
| 352 | char const * app = verbose_cookie(sf->app_cookie); |
| 353 | printf("0x%llx(%u): ", pc, counter); |
| 354 | if (sf->anon) { |
| 355 | printf("anon (tgid %u, 0x%llx-0x%llx), ", |
| 356 | (unsigned int)sf->anon->tgid, |
| 357 | sf->anon->start, sf->anon->end); |
| 358 | } else if (sf->kernel) { |
| 359 | printf("kern (name %s, 0x%llx-0x%llx), ", sf->kernel->name, |
| 360 | sf->kernel->start, sf->kernel->end); |
| 361 | } else { |
| 362 | printf("%s(%llx), ", verbose_cookie(sf->cookie), sf->cookie); |
| 363 | } |
| 364 | printf("app %s(%llx)", app, sf->app_cookie); |
| 365 | } |
| 366 | |
| 367 | |
| 368 | static void verbose_sample(struct transient const * trans, vma_t pc) |
| 369 | { |
| 370 | printf("Sample "); |
| 371 | verbose_print_sample(trans->current, pc, trans->event); |
| 372 | printf("\n"); |
| 373 | } |
| 374 | |
| 375 | |
| 376 | static void |
| 377 | verbose_arc(struct transient const * trans, vma_t from, vma_t to) |
| 378 | { |
| 379 | printf("Arc "); |
| 380 | verbose_print_sample(trans->current, from, trans->event); |
| 381 | printf(" -> 0x%llx", to); |
| 382 | printf("\n"); |
| 383 | } |
| 384 | |
| 385 | |
| 386 | static void sfile_log_arc(struct transient const * trans) |
| 387 | { |
| 388 | int err; |
| 389 | vma_t from = trans->pc; |
| 390 | vma_t to = trans->last_pc; |
| 391 | uint64_t key; |
| 392 | odb_t * file; |
| 393 | |
| 394 | file = get_file(trans, 1); |
| 395 | |
| 396 | /* absolute value -> offset */ |
| 397 | if (trans->current->kernel) |
| 398 | from -= trans->current->kernel->start; |
| 399 | |
| 400 | if (trans->last->kernel) |
| 401 | to -= trans->last->kernel->start; |
| 402 | |
| 403 | if (trans->current->anon) |
| 404 | from -= trans->current->anon->start; |
| 405 | |
| 406 | if (trans->last->anon) |
| 407 | to -= trans->last->anon->start; |
| 408 | |
| 409 | if (varcs) |
| 410 | verbose_arc(trans, from, to); |
| 411 | |
| 412 | if (!file) { |
| 413 | opd_stats[OPD_LOST_SAMPLEFILE]++; |
| 414 | return; |
| 415 | } |
| 416 | |
| 417 | /* Possible narrowings to 32-bit value only. */ |
| 418 | key = to & (0xffffffff); |
| 419 | key |= ((uint64_t)from) << 32; |
| 420 | |
| 421 | err = odb_update_node(file, key); |
| 422 | if (err) { |
| 423 | fprintf(stderr, "%s: %s\n", __FUNCTION__, strerror(err)); |
| 424 | abort(); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | |
| 429 | void sfile_log_sample(struct transient const * trans) |
| 430 | { |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 431 | sfile_log_sample_count(trans, 1); |
| 432 | } |
| 433 | |
| 434 | |
| 435 | void sfile_log_sample_count(struct transient const * trans, |
| 436 | unsigned long int count) |
| 437 | { |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 438 | int err; |
| 439 | vma_t pc = trans->pc; |
| 440 | odb_t * file; |
| 441 | |
| 442 | if (trans->tracing == TRACING_ON) { |
| 443 | /* can happen if kernel sample falls through the cracks, |
| 444 | * see opd_put_sample() */ |
| 445 | if (trans->last) |
| 446 | sfile_log_arc(trans); |
| 447 | return; |
| 448 | } |
| 449 | |
| 450 | file = get_file(trans, 0); |
| 451 | |
| 452 | /* absolute value -> offset */ |
| 453 | if (trans->current->kernel) |
| 454 | pc -= trans->current->kernel->start; |
| 455 | |
| 456 | if (trans->current->anon) |
| 457 | pc -= trans->current->anon->start; |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 458 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 459 | if (vsamples) |
| 460 | verbose_sample(trans, pc); |
| 461 | |
| 462 | if (!file) { |
| 463 | opd_stats[OPD_LOST_SAMPLEFILE]++; |
| 464 | return; |
| 465 | } |
| 466 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 467 | err = odb_update_node_with_offset(file, |
| 468 | (odb_key_t)pc, |
| 469 | count); |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 470 | if (err) { |
| 471 | fprintf(stderr, "%s: %s\n", __FUNCTION__, strerror(err)); |
| 472 | abort(); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | |
| 477 | static int close_sfile(struct sfile * sf, void * data __attribute__((unused))) |
| 478 | { |
| 479 | size_t i; |
| 480 | |
| 481 | /* it's OK to close a non-open odb file */ |
| 482 | for (i = 0; i < op_nr_counters; ++i) |
| 483 | odb_close(&sf->files[i]); |
| 484 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 485 | opd_ext_sfile_close(sf); |
| 486 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 487 | return 0; |
| 488 | } |
| 489 | |
| 490 | |
| 491 | static void kill_sfile(struct sfile * sf) |
| 492 | { |
| 493 | close_sfile(sf, NULL); |
| 494 | list_del(&sf->hash); |
| 495 | list_del(&sf->lru); |
| 496 | } |
| 497 | |
| 498 | |
| 499 | static int sync_sfile(struct sfile * sf, void * data __attribute__((unused))) |
| 500 | { |
| 501 | size_t i; |
| 502 | |
| 503 | for (i = 0; i < op_nr_counters; ++i) |
| 504 | odb_sync(&sf->files[i]); |
| 505 | |
Ben Cheng | 5a4eb4e | 2009-09-14 16:00:41 -0700 | [diff] [blame] | 506 | opd_ext_sfile_sync(sf); |
| 507 | |
The Android Open Source Project | 10e23ee | 2009-03-03 19:30:30 -0800 | [diff] [blame] | 508 | return 0; |
| 509 | } |
| 510 | |
| 511 | |
| 512 | static int is_sfile_kernel(struct sfile * sf, void * data __attribute__((unused))) |
| 513 | { |
| 514 | return !!sf->kernel; |
| 515 | } |
| 516 | |
| 517 | |
| 518 | static int is_sfile_anon(struct sfile * sf, void * data) |
| 519 | { |
| 520 | return sf->anon == data; |
| 521 | } |
| 522 | |
| 523 | |
| 524 | typedef int (*sfile_func)(struct sfile *, void *); |
| 525 | |
| 526 | static void |
| 527 | for_one_sfile(struct sfile * sf, sfile_func func, void * data) |
| 528 | { |
| 529 | size_t i; |
| 530 | int free_sf = func(sf, data); |
| 531 | |
| 532 | for (i = 0; i < CG_HASH_SIZE; ++i) { |
| 533 | struct list_head * pos; |
| 534 | struct list_head * pos2; |
| 535 | list_for_each_safe(pos, pos2, &sf->cg_hash[i]) { |
| 536 | struct cg_entry * cg = |
| 537 | list_entry(pos, struct cg_entry, hash); |
| 538 | if (free_sf || func(&cg->to, data)) { |
| 539 | kill_sfile(&cg->to); |
| 540 | list_del(&cg->hash); |
| 541 | free(cg); |
| 542 | } |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | if (free_sf) { |
| 547 | kill_sfile(sf); |
| 548 | free(sf); |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | |
| 553 | static void for_each_sfile(sfile_func func, void * data) |
| 554 | { |
| 555 | struct list_head * pos; |
| 556 | struct list_head * pos2; |
| 557 | |
| 558 | list_for_each_safe(pos, pos2, &lru_list) { |
| 559 | struct sfile * sf = list_entry(pos, struct sfile, lru); |
| 560 | for_one_sfile(sf, func, data); |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | |
| 565 | void sfile_clear_kernel(void) |
| 566 | { |
| 567 | for_each_sfile(is_sfile_kernel, NULL); |
| 568 | } |
| 569 | |
| 570 | |
| 571 | void sfile_clear_anon(struct anon_mapping * anon) |
| 572 | { |
| 573 | for_each_sfile(is_sfile_anon, anon); |
| 574 | } |
| 575 | |
| 576 | |
| 577 | void sfile_sync_files(void) |
| 578 | { |
| 579 | for_each_sfile(sync_sfile, NULL); |
| 580 | } |
| 581 | |
| 582 | |
| 583 | void sfile_close_files(void) |
| 584 | { |
| 585 | for_each_sfile(close_sfile, NULL); |
| 586 | } |
| 587 | |
| 588 | |
| 589 | static int always_true(void) |
| 590 | { |
| 591 | return 1; |
| 592 | } |
| 593 | |
| 594 | |
| 595 | #define LRU_AMOUNT 256 |
| 596 | |
| 597 | /* |
| 598 | * Clear out older sfiles. Note the current sfiles we're using |
| 599 | * will not be present in this list, due to sfile_get/put() pairs |
| 600 | * around the caller of this. |
| 601 | */ |
| 602 | int sfile_lru_clear(void) |
| 603 | { |
| 604 | struct list_head * pos; |
| 605 | struct list_head * pos2; |
| 606 | int amount = LRU_AMOUNT; |
| 607 | |
| 608 | if (list_empty(&lru_list)) |
| 609 | return 1; |
| 610 | |
| 611 | list_for_each_safe(pos, pos2, &lru_list) { |
| 612 | struct sfile * sf; |
| 613 | if (!--amount) |
| 614 | break; |
| 615 | sf = list_entry(pos, struct sfile, lru); |
| 616 | for_one_sfile(sf, (sfile_func)always_true, NULL); |
| 617 | } |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | |
| 623 | void sfile_get(struct sfile * sf) |
| 624 | { |
| 625 | if (sf) |
| 626 | list_del(&sf->lru); |
| 627 | } |
| 628 | |
| 629 | |
| 630 | void sfile_put(struct sfile * sf) |
| 631 | { |
| 632 | if (sf) |
| 633 | list_add_tail(&sf->lru, &lru_list); |
| 634 | } |
| 635 | |
| 636 | |
| 637 | void sfile_init(void) |
| 638 | { |
| 639 | size_t i = 0; |
| 640 | |
| 641 | for (; i < HASH_SIZE; ++i) |
| 642 | list_init(&hashes[i]); |
| 643 | } |