Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/dev/hwpmc/hwpmc_logging.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005-2007 Joseph Koshy 5 * Copyright (c) 2007 The FreeBSD Foundation 6 * Copyright (c) 2018 Matthew Macy 7 * All rights reserved. 8 * 9 * Portions of this software were developed by A. Joseph Koshy under 10 * sponsorship from the FreeBSD Foundation and Google, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Logging code for hwpmc(4) 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/capsicum.h> 44 #include <sys/domainset.h> 45 #include <sys/file.h> 46 #include <sys/kernel.h> 47 #include <sys/kthread.h> 48 #include <sys/lock.h> 49 #include <sys/module.h> 50 #include <sys/mutex.h> 51 #include <sys/pmc.h> 52 #include <sys/pmckern.h> 53 #include <sys/pmclog.h> 54 #include <sys/proc.h> 55 #include <sys/sched.h> 56 #include <sys/signalvar.h> 57 #include <sys/smp.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/systm.h> 61 #include <sys/uio.h> 62 #include <sys/unistd.h> 63 #include <sys/vnode.h> 64 65 #if defined(__i386__) || defined(__amd64__) 66 #include <machine/clock.h> 67 #endif 68 69 #define curdomain PCPU_GET(domain) 70 71 /* 72 * Sysctl tunables 73 */ 74 75 SYSCTL_DECL(_kern_hwpmc); 76 77 /* 78 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 79 */ 80 81 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 82 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 83 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 84 85 /* 86 * kern.hwpmc.nbuffers_pcpu -- number of global log buffers 87 */ 88 89 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 90 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 91 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 92 93 /* 94 * Global log buffer list and associated spin lock. 95 */ 96 97 static struct mtx pmc_kthread_mtx; /* sleep lock */ 98 99 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 100 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 101 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 102 (D)->plb_domain = domain; \ 103 } while (0) 104 105 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 106 (D)->plb_ptr = (D)->plb_base; \ 107 } while (0) 108 109 /* 110 * Log file record constructors. 111 */ 112 #define _PMCLOG_TO_HEADER(T,L) \ 113 ((PMCLOG_HEADER_MAGIC << 24) | \ 114 (PMCLOG_TYPE_ ## T << 16) | \ 115 ((L) & 0xFFFF)) 116 117 /* reserve LEN bytes of space and initialize the entry header */ 118 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ 119 uint32_t *_le; \ 120 int _len = roundup((LEN), sizeof(uint32_t)); \ 121 struct pmclog_header *ph; \ 122 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 123 ACTION; \ 124 } \ 125 ph = (struct pmclog_header *)_le; \ 126 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 127 ph->pl_tsc = (TSC); \ 128 _le += sizeof(*ph)/4 /* skip over timestamp */ 129 130 /* reserve LEN bytes of space and initialize the entry header */ 131 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 132 uint32_t *_le; \ 133 int _len = roundup((LEN), sizeof(uint32_t)); \ 134 uint64_t tsc; \ 135 struct pmclog_header *ph; \ 136 tsc = pmc_rdtsc(); \ 137 spinlock_enter(); \ 138 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 139 spinlock_exit(); \ 140 ACTION; \ 141 } \ 142 ph = (struct pmclog_header *)_le; \ 143 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 144 ph->pl_tsc = tsc; \ 145 _le += sizeof(*ph)/4 /* skip over timestamp */ 146 147 148 149 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) 150 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 151 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 152 error=ENOMEM;goto error) 153 154 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 155 #define PMCLOG_EMIT64(V) do { \ 156 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 157 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 158 } while (0) 159 160 161 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 162 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 163 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 164 165 #define PMCLOG_DESPATCH_SAFE(PO) \ 166 pmclog_release((PO)); \ 167 } while (0) 168 169 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 170 pmclog_release_flags((PO), 0); \ 171 } while (0) 172 173 #define PMCLOG_DESPATCH(PO) \ 174 pmclog_release((PO)); \ 175 spinlock_exit(); \ 176 } while (0) 177 178 #define PMCLOG_DESPATCH_SYNC(PO) \ 179 pmclog_schedule_io((PO), 1); \ 180 spinlock_exit(); \ 181 } while (0) 182 183 184 #define TSDELTA 4 185 /* 186 * Assertions about the log file format. 187 */ 188 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + 189 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 190 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); 191 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); 192 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 193 5*4 + sizeof(uintfptr_t)); 194 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 195 5*4 + TSDELTA + sizeof(uintfptr_t)); 196 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); 197 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); 198 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); 199 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); 200 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); 201 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); 202 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 203 sizeof(uintfptr_t) + TSDELTA); 204 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + 205 sizeof(uintfptr_t)); 206 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); 207 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); 208 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); 209 CTASSERT(sizeof(struct pmclog_userdata) == 6*4); 210 211 /* 212 * Log buffer structure 213 */ 214 215 struct pmclog_buffer { 216 TAILQ_ENTRY(pmclog_buffer) plb_next; 217 char *plb_base; 218 char *plb_ptr; 219 char *plb_fence; 220 uint16_t plb_domain; 221 } __aligned(CACHE_LINE_SIZE); 222 223 /* 224 * Prototypes 225 */ 226 227 static int pmclog_get_buffer(struct pmc_owner *po); 228 static void pmclog_loop(void *arg); 229 static void pmclog_release(struct pmc_owner *po); 230 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 231 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 232 static void pmclog_schedule_all(struct pmc_owner *po); 233 static void pmclog_stop_kthread(struct pmc_owner *po); 234 235 /* 236 * Helper functions 237 */ 238 239 static inline void 240 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 241 { 242 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 243 } 244 245 static inline void 246 pmc_plb_rele(struct pmclog_buffer *plb) 247 { 248 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 249 pmc_plb_rele_unlocked(plb); 250 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 251 } 252 253 /* 254 * Get a log buffer 255 */ 256 static int 257 pmclog_get_buffer(struct pmc_owner *po) 258 { 259 struct pmclog_buffer *plb; 260 int domain; 261 262 KASSERT(po->po_curbuf[curcpu] == NULL, 263 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 264 265 domain = curdomain; 266 MPASS(pmc_dom_hdrs[domain]); 267 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 268 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 269 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 270 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 271 272 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 273 274 #ifdef HWPMC_DEBUG 275 if (plb) 276 KASSERT(plb->plb_ptr == plb->plb_base && 277 plb->plb_base < plb->plb_fence, 278 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 279 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 280 plb->plb_base, plb->plb_fence)); 281 #endif 282 283 po->po_curbuf[curcpu] = plb; 284 285 /* update stats */ 286 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 287 if (plb == NULL) 288 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 289 290 return (plb ? 0 : ENOMEM); 291 } 292 293 struct pmclog_proc_init_args { 294 struct proc *kthr; 295 struct pmc_owner *po; 296 bool exit; 297 bool acted; 298 }; 299 300 int 301 pmclog_proc_create(struct thread *td, void **handlep) 302 { 303 struct pmclog_proc_init_args *ia; 304 int error; 305 306 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 307 error = kproc_create(pmclog_loop, ia, &ia->kthr, 308 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 309 if (error == 0) 310 *handlep = ia; 311 return (error); 312 } 313 314 void 315 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 316 { 317 struct pmclog_proc_init_args *ia; 318 319 ia = handle; 320 mtx_lock(&pmc_kthread_mtx); 321 MPASS(!ia->acted); 322 MPASS(ia->po == NULL); 323 MPASS(!ia->exit); 324 MPASS(ia->kthr != NULL); 325 if (po == NULL) { 326 ia->exit = true; 327 } else { 328 ia->po = po; 329 KASSERT(po->po_kthread == NULL, 330 ("[pmclog,%d] po=%p kthread (%p) already present", 331 __LINE__, po, po->po_kthread)); 332 po->po_kthread = ia->kthr; 333 } 334 wakeup(ia); 335 while (!ia->acted) 336 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 337 mtx_unlock(&pmc_kthread_mtx); 338 free(ia, M_TEMP); 339 } 340 341 /* 342 * Log handler loop. 343 * 344 * This function is executed by each pmc owner's helper thread. 345 */ 346 static void 347 pmclog_loop(void *arg) 348 { 349 struct pmclog_proc_init_args *ia; 350 struct pmc_owner *po; 351 struct pmclog_buffer *lb; 352 struct proc *p; 353 struct ucred *ownercred; 354 struct ucred *mycred; 355 struct thread *td; 356 sigset_t unb; 357 struct uio auio; 358 struct iovec aiov; 359 size_t nbytes; 360 int error; 361 362 td = curthread; 363 364 SIGEMPTYSET(unb); 365 SIGADDSET(unb, SIGHUP); 366 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 367 368 ia = arg; 369 MPASS(ia->kthr == curproc); 370 MPASS(!ia->acted); 371 mtx_lock(&pmc_kthread_mtx); 372 while (ia->po == NULL && !ia->exit) 373 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 374 if (ia->exit) { 375 ia->acted = true; 376 wakeup(ia); 377 mtx_unlock(&pmc_kthread_mtx); 378 kproc_exit(0); 379 } 380 MPASS(ia->po != NULL); 381 po = ia->po; 382 ia->acted = true; 383 wakeup(ia); 384 mtx_unlock(&pmc_kthread_mtx); 385 ia = NULL; 386 387 p = po->po_owner; 388 mycred = td->td_ucred; 389 390 PROC_LOCK(p); 391 ownercred = crhold(p->p_ucred); 392 PROC_UNLOCK(p); 393 394 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 395 KASSERT(po->po_kthread == curthread->td_proc, 396 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 397 po, po->po_kthread, curthread->td_proc)); 398 399 lb = NULL; 400 401 402 /* 403 * Loop waiting for I/O requests to be added to the owner 404 * struct's queue. The loop is exited when the log file 405 * is deconfigured. 406 */ 407 408 mtx_lock(&pmc_kthread_mtx); 409 410 for (;;) { 411 412 /* check if we've been asked to exit */ 413 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 414 break; 415 416 if (lb == NULL) { /* look for a fresh buffer to write */ 417 mtx_lock_spin(&po->po_mtx); 418 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 419 mtx_unlock_spin(&po->po_mtx); 420 421 /* No more buffers and shutdown required. */ 422 if (po->po_flags & PMC_PO_SHUTDOWN) 423 break; 424 425 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 426 "pmcloop", 250); 427 continue; 428 } 429 430 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 431 mtx_unlock_spin(&po->po_mtx); 432 } 433 434 mtx_unlock(&pmc_kthread_mtx); 435 436 /* process the request */ 437 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 438 lb->plb_base, lb->plb_ptr); 439 /* change our thread's credentials before issuing the I/O */ 440 441 aiov.iov_base = lb->plb_base; 442 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 443 444 auio.uio_iov = &aiov; 445 auio.uio_iovcnt = 1; 446 auio.uio_offset = -1; 447 auio.uio_resid = nbytes; 448 auio.uio_rw = UIO_WRITE; 449 auio.uio_segflg = UIO_SYSSPACE; 450 auio.uio_td = td; 451 452 /* switch thread credentials -- see kern_ktrace.c */ 453 td->td_ucred = ownercred; 454 error = fo_write(po->po_file, &auio, ownercred, 0, td); 455 td->td_ucred = mycred; 456 457 if (error) { 458 /* XXX some errors are recoverable */ 459 /* send a SIGIO to the owner and exit */ 460 PROC_LOCK(p); 461 kern_psignal(p, SIGIO); 462 PROC_UNLOCK(p); 463 464 mtx_lock(&pmc_kthread_mtx); 465 466 po->po_error = error; /* save for flush log */ 467 468 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 469 470 break; 471 } 472 473 mtx_lock(&pmc_kthread_mtx); 474 475 /* put the used buffer back into the global pool */ 476 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 477 478 pmc_plb_rele(lb); 479 lb = NULL; 480 } 481 482 wakeup_one(po->po_kthread); 483 po->po_kthread = NULL; 484 485 mtx_unlock(&pmc_kthread_mtx); 486 487 /* return the current I/O buffer to the global pool */ 488 if (lb) { 489 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 490 491 pmc_plb_rele(lb); 492 } 493 494 /* 495 * Exit this thread, signalling the waiter 496 */ 497 498 crfree(ownercred); 499 500 kproc_exit(0); 501 } 502 503 /* 504 * Release and log entry and schedule an I/O if needed. 505 */ 506 507 static void 508 pmclog_release_flags(struct pmc_owner *po, int wakeup) 509 { 510 struct pmclog_buffer *plb; 511 512 plb = po->po_curbuf[curcpu]; 513 KASSERT(plb->plb_ptr >= plb->plb_base, 514 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 515 po, plb->plb_ptr, plb->plb_base)); 516 KASSERT(plb->plb_ptr <= plb->plb_fence, 517 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 518 po, plb->plb_ptr, plb->plb_fence)); 519 520 /* schedule an I/O if we've filled a buffer */ 521 if (plb->plb_ptr >= plb->plb_fence) 522 pmclog_schedule_io(po, wakeup); 523 524 PMCDBG1(LOG,REL,1, "po=%p", po); 525 } 526 527 static void 528 pmclog_release(struct pmc_owner *po) 529 { 530 531 pmclog_release_flags(po, 1); 532 } 533 534 535 /* 536 * Attempt to reserve 'length' bytes of space in an owner's log 537 * buffer. The function returns a pointer to 'length' bytes of space 538 * if there was enough space or returns NULL if no space was 539 * available. Non-null returns do so with the po mutex locked. The 540 * caller must invoke pmclog_release() on the pmc owner structure 541 * when done. 542 */ 543 544 static uint32_t * 545 pmclog_reserve(struct pmc_owner *po, int length) 546 { 547 uintptr_t newptr, oldptr __diagused; 548 struct pmclog_buffer *plb, **pplb; 549 550 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 551 552 KASSERT(length % sizeof(uint32_t) == 0, 553 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 554 555 /* No more data when shutdown in progress. */ 556 if (po->po_flags & PMC_PO_SHUTDOWN) 557 return (NULL); 558 559 pplb = &po->po_curbuf[curcpu]; 560 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 561 goto fail; 562 563 KASSERT(*pplb != NULL, 564 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 565 566 plb = *pplb; 567 KASSERT(plb->plb_ptr >= plb->plb_base && 568 plb->plb_ptr <= plb->plb_fence, 569 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 570 __LINE__, po, plb->plb_ptr, plb->plb_base, 571 plb->plb_fence)); 572 573 oldptr = (uintptr_t) plb->plb_ptr; 574 newptr = oldptr + length; 575 576 KASSERT(oldptr != (uintptr_t) NULL, 577 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 578 579 /* 580 * If we have space in the current buffer, return a pointer to 581 * available space with the PO structure locked. 582 */ 583 if (newptr <= (uintptr_t) plb->plb_fence) { 584 plb->plb_ptr = (char *) newptr; 585 goto done; 586 } 587 588 /* 589 * Otherwise, schedule the current buffer for output and get a 590 * fresh buffer. 591 */ 592 pmclog_schedule_io(po, 0); 593 594 if (pmclog_get_buffer(po) != 0) 595 goto fail; 596 597 plb = *pplb; 598 KASSERT(plb != NULL, 599 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 600 601 KASSERT(plb->plb_ptr != NULL, 602 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 603 604 KASSERT(plb->plb_ptr == plb->plb_base && 605 plb->plb_ptr <= plb->plb_fence, 606 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 607 __LINE__, po, plb->plb_ptr, plb->plb_base, 608 plb->plb_fence)); 609 610 oldptr = (uintptr_t) plb->plb_ptr; 611 612 done: 613 return ((uint32_t *) oldptr); 614 fail: 615 return (NULL); 616 } 617 618 /* 619 * Schedule an I/O. 620 * 621 * Transfer the current buffer to the helper kthread. 622 */ 623 624 static void 625 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 626 { 627 struct pmclog_buffer *plb; 628 629 plb = po->po_curbuf[curcpu]; 630 po->po_curbuf[curcpu] = NULL; 631 KASSERT(plb != NULL, 632 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 633 KASSERT(plb->plb_ptr >= plb->plb_base, 634 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 635 po, plb->plb_ptr, plb->plb_base)); 636 KASSERT(plb->plb_ptr <= plb->plb_fence, 637 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 638 po, plb->plb_ptr, plb->plb_fence)); 639 640 PMCDBG1(LOG,SIO, 1, "po=%p", po); 641 642 /* 643 * Add the current buffer to the tail of the buffer list and 644 * wakeup the helper. 645 */ 646 mtx_lock_spin(&po->po_mtx); 647 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 648 mtx_unlock_spin(&po->po_mtx); 649 if (wakeup) 650 wakeup_one(po); 651 } 652 653 /* 654 * Stop the helper kthread. 655 */ 656 657 static void 658 pmclog_stop_kthread(struct pmc_owner *po) 659 { 660 661 mtx_lock(&pmc_kthread_mtx); 662 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 663 if (po->po_kthread != NULL) { 664 PROC_LOCK(po->po_kthread); 665 kern_psignal(po->po_kthread, SIGHUP); 666 PROC_UNLOCK(po->po_kthread); 667 } 668 wakeup_one(po); 669 while (po->po_kthread) 670 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 671 mtx_unlock(&pmc_kthread_mtx); 672 } 673 674 /* 675 * Public functions 676 */ 677 678 /* 679 * Configure a log file for pmc owner 'po'. 680 * 681 * Parameter 'logfd' is a file handle referencing an open file in the 682 * owner process. This file needs to have been opened for writing. 683 */ 684 685 int 686 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 687 { 688 struct proc *p; 689 struct timespec ts; 690 int error; 691 692 sx_assert(&pmc_sx, SA_XLOCKED); 693 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 694 695 p = po->po_owner; 696 697 /* return EBUSY if a log file was already present */ 698 if (po->po_flags & PMC_PO_OWNS_LOGFILE) 699 return (EBUSY); 700 701 KASSERT(po->po_file == NULL, 702 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 703 po->po_file)); 704 705 /* get a reference to the file state */ 706 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); 707 if (error) 708 goto error; 709 710 /* mark process as owning a log file */ 711 po->po_flags |= PMC_PO_OWNS_LOGFILE; 712 713 /* mark process as using HWPMCs */ 714 PROC_LOCK(p); 715 p->p_flag |= P_HWPMC; 716 PROC_UNLOCK(p); 717 nanotime(&ts); 718 /* create a log initialization entry */ 719 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, 720 sizeof(struct pmclog_initialize)); 721 PMCLOG_EMIT32(PMC_VERSION); 722 PMCLOG_EMIT32(md->pmd_cputype); 723 #if defined(__i386__) || defined(__amd64__) 724 PMCLOG_EMIT64(tsc_freq); 725 #else 726 /* other architectures will need to fill this in */ 727 PMCLOG_EMIT32(0); 728 PMCLOG_EMIT32(0); 729 #endif 730 memcpy(_le, &ts, sizeof(ts)); 731 _le += sizeof(ts)/4; 732 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 733 PMCLOG_DESPATCH_SYNC(po); 734 735 return (0); 736 737 error: 738 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 739 "stopped", __LINE__, po)); 740 741 if (po->po_file) 742 (void) fdrop(po->po_file, curthread); 743 po->po_file = NULL; /* clear file and error state */ 744 po->po_error = 0; 745 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 746 747 return (error); 748 } 749 750 751 /* 752 * De-configure a log file. This will throw away any buffers queued 753 * for this owner process. 754 */ 755 756 int 757 pmclog_deconfigure_log(struct pmc_owner *po) 758 { 759 int error; 760 struct pmclog_buffer *lb; 761 struct pmc_binding pb; 762 763 PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 764 765 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 766 return (EINVAL); 767 768 KASSERT(po->po_sscount == 0, 769 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 770 KASSERT(po->po_file != NULL, 771 ("[pmclog,%d] po=%p no log file", __LINE__, po)); 772 773 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 774 pmclog_stop_kthread(po); 775 776 KASSERT(po->po_kthread == NULL, 777 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 778 779 /* return all queued log buffers to the global pool */ 780 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 781 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 782 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 783 pmc_plb_rele(lb); 784 } 785 pmc_save_cpu_binding(&pb); 786 for (int i = 0; i < mp_ncpus; i++) { 787 pmc_select_cpu(i); 788 /* return the 'current' buffer to the global pool */ 789 if ((lb = po->po_curbuf[curcpu]) != NULL) { 790 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 791 pmc_plb_rele(lb); 792 } 793 } 794 pmc_restore_cpu_binding(&pb); 795 796 /* drop a reference to the fd */ 797 if (po->po_file != NULL) { 798 error = fdrop(po->po_file, curthread); 799 po->po_file = NULL; 800 } else 801 error = 0; 802 po->po_error = 0; 803 804 return (error); 805 } 806 807 /* 808 * Flush a process' log buffer. 809 */ 810 811 int 812 pmclog_flush(struct pmc_owner *po, int force) 813 { 814 int error; 815 816 PMCDBG1(LOG,FLS,1, "po=%p", po); 817 818 /* 819 * If there is a pending error recorded by the logger thread, 820 * return that. 821 */ 822 if (po->po_error) 823 return (po->po_error); 824 825 error = 0; 826 827 /* 828 * Check that we do have an active log file. 829 */ 830 mtx_lock(&pmc_kthread_mtx); 831 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 832 error = EINVAL; 833 goto error; 834 } 835 836 pmclog_schedule_all(po); 837 error: 838 mtx_unlock(&pmc_kthread_mtx); 839 840 return (error); 841 } 842 843 static void 844 pmclog_schedule_one_cond(struct pmc_owner *po) 845 { 846 struct pmclog_buffer *plb; 847 int cpu; 848 849 spinlock_enter(); 850 cpu = curcpu; 851 /* tell hardclock not to run again */ 852 if (PMC_CPU_HAS_SAMPLES(cpu)) 853 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 854 855 plb = po->po_curbuf[cpu]; 856 if (plb && plb->plb_ptr != plb->plb_base) 857 pmclog_schedule_io(po, 1); 858 spinlock_exit(); 859 } 860 861 static void 862 pmclog_schedule_all(struct pmc_owner *po) 863 { 864 struct pmc_binding pb; 865 866 /* 867 * Schedule the current buffer if any and not empty. 868 */ 869 pmc_save_cpu_binding(&pb); 870 for (int i = 0; i < mp_ncpus; i++) { 871 pmc_select_cpu(i); 872 pmclog_schedule_one_cond(po); 873 } 874 pmc_restore_cpu_binding(&pb); 875 } 876 877 int 878 pmclog_close(struct pmc_owner *po) 879 { 880 881 PMCDBG1(LOG,CLO,1, "po=%p", po); 882 883 pmclog_process_closelog(po); 884 885 mtx_lock(&pmc_kthread_mtx); 886 /* 887 * Initiate shutdown: no new data queued, 888 * thread will close file on last block. 889 */ 890 po->po_flags |= PMC_PO_SHUTDOWN; 891 /* give time for all to see */ 892 DELAY(50); 893 894 /* 895 * Schedule the current buffer. 896 */ 897 pmclog_schedule_all(po); 898 wakeup_one(po); 899 900 mtx_unlock(&pmc_kthread_mtx); 901 902 return (0); 903 } 904 905 void 906 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 907 { 908 int n, recordlen; 909 uint32_t flags; 910 struct pmc_owner *po; 911 912 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 913 ps->ps_nsamples); 914 915 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 916 ps->ps_nsamples * sizeof(uintfptr_t); 917 po = pm->pm_owner; 918 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 919 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc); 920 PMCLOG_EMIT32(ps->ps_pid); 921 PMCLOG_EMIT32(ps->ps_tid); 922 PMCLOG_EMIT32(pm->pm_id); 923 PMCLOG_EMIT32(flags); 924 for (n = 0; n < ps->ps_nsamples; n++) 925 PMCLOG_EMITADDR(ps->ps_pc[n]); 926 PMCLOG_DESPATCH_SAFE(po); 927 } 928 929 void 930 pmclog_process_closelog(struct pmc_owner *po) 931 { 932 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); 933 PMCLOG_DESPATCH_SYNC(po); 934 } 935 936 void 937 pmclog_process_dropnotify(struct pmc_owner *po) 938 { 939 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); 940 PMCLOG_DESPATCH(po); 941 } 942 943 void 944 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 945 const char *path) 946 { 947 int pathlen, recordlen; 948 949 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 950 951 pathlen = strlen(path) + 1; /* #bytes for path name */ 952 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 953 pathlen; 954 955 PMCLOG_RESERVE(po, MAP_IN, recordlen); 956 PMCLOG_EMIT32(pid); 957 PMCLOG_EMIT32(0); 958 PMCLOG_EMITADDR(start); 959 PMCLOG_EMITSTRING(path,pathlen); 960 PMCLOG_DESPATCH_SYNC(po); 961 } 962 963 void 964 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 965 uintfptr_t end) 966 { 967 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 968 969 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); 970 PMCLOG_EMIT32(pid); 971 PMCLOG_EMIT32(0); 972 PMCLOG_EMITADDR(start); 973 PMCLOG_EMITADDR(end); 974 PMCLOG_DESPATCH(po); 975 } 976 977 void 978 pmclog_process_pmcallocate(struct pmc *pm) 979 { 980 struct pmc_owner *po; 981 struct pmc_soft *ps; 982 983 po = pm->pm_owner; 984 985 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 986 987 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 988 PMCLOG_RESERVE(po, PMCALLOCATEDYN, 989 sizeof(struct pmclog_pmcallocatedyn)); 990 PMCLOG_EMIT32(pm->pm_id); 991 PMCLOG_EMIT32(pm->pm_event); 992 PMCLOG_EMIT32(pm->pm_flags); 993 PMCLOG_EMIT32(0); 994 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 995 ps = pmc_soft_ev_acquire(pm->pm_event); 996 if (ps != NULL) 997 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 998 else 999 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 1000 pmc_soft_ev_release(ps); 1001 PMCLOG_DESPATCH_SYNC(po); 1002 } else { 1003 PMCLOG_RESERVE(po, PMCALLOCATE, 1004 sizeof(struct pmclog_pmcallocate)); 1005 PMCLOG_EMIT32(pm->pm_id); 1006 PMCLOG_EMIT32(pm->pm_event); 1007 PMCLOG_EMIT32(pm->pm_flags); 1008 PMCLOG_EMIT32(0); 1009 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1010 PMCLOG_DESPATCH_SYNC(po); 1011 } 1012 } 1013 1014 void 1015 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 1016 { 1017 int pathlen, recordlen; 1018 struct pmc_owner *po; 1019 1020 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 1021 1022 po = pm->pm_owner; 1023 1024 pathlen = strlen(path) + 1; /* #bytes for the string */ 1025 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 1026 1027 PMCLOG_RESERVE(po, PMCATTACH, recordlen); 1028 PMCLOG_EMIT32(pm->pm_id); 1029 PMCLOG_EMIT32(pid); 1030 PMCLOG_EMITSTRING(path, pathlen); 1031 PMCLOG_DESPATCH_SYNC(po); 1032 } 1033 1034 void 1035 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 1036 { 1037 struct pmc_owner *po; 1038 1039 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 1040 1041 po = pm->pm_owner; 1042 1043 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach)); 1044 PMCLOG_EMIT32(pm->pm_id); 1045 PMCLOG_EMIT32(pid); 1046 PMCLOG_DESPATCH_SYNC(po); 1047 } 1048 1049 void 1050 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1051 { 1052 if (sync) { 1053 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1054 PMCLOG_EMIT32(p->p_pid); 1055 PMCLOG_EMIT32(p->p_flag); 1056 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1057 PMCLOG_DESPATCH_SYNC(po); 1058 } else { 1059 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1060 PMCLOG_EMIT32(p->p_pid); 1061 PMCLOG_EMIT32(p->p_flag); 1062 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1063 PMCLOG_DESPATCH(po); 1064 } 1065 } 1066 1067 /* 1068 * Log a context switch event to the log file. 1069 */ 1070 1071 void 1072 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) 1073 { 1074 struct pmc_owner *po; 1075 1076 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 1077 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 1078 1079 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1080 v); 1081 1082 po = pm->pm_owner; 1083 1084 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc()); 1085 PMCLOG_EMIT64(v); 1086 PMCLOG_EMIT32(pm->pm_id); 1087 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1088 PMCLOG_EMIT32(td->td_tid); 1089 PMCLOG_EMIT32(0); 1090 PMCLOG_DESPATCH_SCHED_LOCK(po); 1091 } 1092 1093 void 1094 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1095 uintfptr_t startaddr, char *path) 1096 { 1097 int pathlen, recordlen; 1098 1099 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1100 1101 pathlen = strlen(path) + 1; /* #bytes for the path */ 1102 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1103 PMCLOG_RESERVE(po, PROCEXEC, recordlen); 1104 PMCLOG_EMIT32(pid); 1105 PMCLOG_EMIT32(pmid); 1106 PMCLOG_EMITADDR(startaddr); 1107 PMCLOG_EMITSTRING(path,pathlen); 1108 PMCLOG_DESPATCH_SYNC(po); 1109 } 1110 1111 /* 1112 * Log a process exit event (and accumulated pmc value) to the log file. 1113 */ 1114 1115 void 1116 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1117 { 1118 int ri; 1119 struct pmc_owner *po; 1120 1121 ri = PMC_TO_ROWINDEX(pm); 1122 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1123 pp->pp_pmcs[ri].pp_pmcval); 1124 1125 po = pm->pm_owner; 1126 1127 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); 1128 PMCLOG_EMIT32(pm->pm_id); 1129 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1130 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1131 PMCLOG_DESPATCH(po); 1132 } 1133 1134 /* 1135 * Log a fork event. 1136 */ 1137 1138 void 1139 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1140 { 1141 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); 1142 PMCLOG_EMIT32(oldpid); 1143 PMCLOG_EMIT32(newpid); 1144 PMCLOG_DESPATCH(po); 1145 } 1146 1147 /* 1148 * Log a process exit event of the form suitable for system-wide PMCs. 1149 */ 1150 1151 void 1152 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1153 { 1154 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); 1155 PMCLOG_EMIT32(pid); 1156 PMCLOG_DESPATCH(po); 1157 } 1158 1159 void 1160 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1161 { 1162 struct proc *p; 1163 1164 p = td->td_proc; 1165 if (sync) { 1166 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1167 PMCLOG_EMIT32(td->td_tid); 1168 PMCLOG_EMIT32(p->p_pid); 1169 PMCLOG_EMIT32(p->p_flag); 1170 PMCLOG_EMIT32(0); 1171 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1172 PMCLOG_DESPATCH_SYNC(po); 1173 } else { 1174 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1175 PMCLOG_EMIT32(td->td_tid); 1176 PMCLOG_EMIT32(p->p_pid); 1177 PMCLOG_EMIT32(p->p_flag); 1178 PMCLOG_EMIT32(0); 1179 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1180 PMCLOG_DESPATCH(po); 1181 } 1182 } 1183 1184 void 1185 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) 1186 { 1187 1188 PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit)); 1189 PMCLOG_EMIT32(td->td_tid); 1190 PMCLOG_DESPATCH(po); 1191 } 1192 1193 /* 1194 * Write a user log entry. 1195 */ 1196 1197 int 1198 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1199 { 1200 int error; 1201 1202 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1203 1204 error = 0; 1205 1206 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, 1207 sizeof(struct pmclog_userdata)); 1208 PMCLOG_EMIT32(wl->pm_userdata); 1209 PMCLOG_DESPATCH(po); 1210 1211 error: 1212 return (error); 1213 } 1214 1215 /* 1216 * Initialization. 1217 * 1218 * Create a pool of log buffers and initialize mutexes. 1219 */ 1220 1221 void 1222 pmclog_initialize(void) 1223 { 1224 struct pmclog_buffer *plb; 1225 int domain, ncpus, total; 1226 1227 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1228 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1229 "greater than zero and less than or equal to 16MB.\n", 1230 pmclog_buffer_size); 1231 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1232 } 1233 1234 if (pmc_nlogbuffers_pcpu <= 0) { 1235 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1236 "than zero.\n", pmc_nlogbuffers_pcpu); 1237 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1238 } 1239 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1240 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1241 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1242 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1243 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1244 } 1245 for (domain = 0; domain < vm_ndomains; domain++) { 1246 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1247 total = ncpus * pmc_nlogbuffers_pcpu; 1248 1249 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total, 1250 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1251 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1252 for (; total > 0; total--, plb++) { 1253 void *buf; 1254 1255 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC, 1256 DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1257 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); 1258 pmc_plb_rele_unlocked(plb); 1259 } 1260 } 1261 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1262 } 1263 1264 /* 1265 * Shutdown logging. 1266 * 1267 * Destroy mutexes and release memory back the to free pool. 1268 */ 1269 1270 void 1271 pmclog_shutdown(void) 1272 { 1273 struct pmclog_buffer *plb; 1274 int domain; 1275 1276 mtx_destroy(&pmc_kthread_mtx); 1277 1278 for (domain = 0; domain < vm_ndomains; domain++) { 1279 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { 1280 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 1281 free(plb->plb_base, M_PMC); 1282 } 1283 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); 1284 } 1285 }
Cache object: d11e9ff108cc06ddfaf5576fe370a338
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]