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 #if (__FreeBSD_version < 1100000) 83 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size); 84 #endif 85 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 86 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 87 88 /* 89 * kern.hwpmc.nbuffers_pcpu -- number of global log buffers 90 */ 91 92 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 93 #if (__FreeBSD_version < 1100000) 94 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu); 95 #endif 96 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 97 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 98 99 /* 100 * Global log buffer list and associated spin lock. 101 */ 102 103 static struct mtx pmc_kthread_mtx; /* sleep lock */ 104 105 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 106 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 107 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 108 (D)->plb_domain = domain; \ 109 } while (0) 110 111 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 112 (D)->plb_ptr = (D)->plb_base; \ 113 } while (0) 114 115 /* 116 * Log file record constructors. 117 */ 118 #define _PMCLOG_TO_HEADER(T,L) \ 119 ((PMCLOG_HEADER_MAGIC << 24) | \ 120 (PMCLOG_TYPE_ ## T << 16) | \ 121 ((L) & 0xFFFF)) 122 123 /* reserve LEN bytes of space and initialize the entry header */ 124 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ 125 uint32_t *_le; \ 126 int _len = roundup((LEN), sizeof(uint32_t)); \ 127 struct pmclog_header *ph; \ 128 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 129 ACTION; \ 130 } \ 131 ph = (struct pmclog_header *)_le; \ 132 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 133 ph->pl_tsc = (TSC); \ 134 _le += sizeof(*ph)/4 /* skip over timestamp */ 135 136 /* reserve LEN bytes of space and initialize the entry header */ 137 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 138 uint32_t *_le; \ 139 int _len = roundup((LEN), sizeof(uint32_t)); \ 140 uint64_t tsc; \ 141 struct pmclog_header *ph; \ 142 tsc = pmc_rdtsc(); \ 143 spinlock_enter(); \ 144 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 145 spinlock_exit(); \ 146 ACTION; \ 147 } \ 148 ph = (struct pmclog_header *)_le; \ 149 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 150 ph->pl_tsc = tsc; \ 151 _le += sizeof(*ph)/4 /* skip over timestamp */ 152 153 154 155 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) 156 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 157 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 158 error=ENOMEM;goto error) 159 160 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 161 #define PMCLOG_EMIT64(V) do { \ 162 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 163 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 164 } while (0) 165 166 167 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 168 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 169 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 170 171 #define PMCLOG_DESPATCH_SAFE(PO) \ 172 pmclog_release((PO)); \ 173 } while (0) 174 175 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 176 pmclog_release_flags((PO), 0); \ 177 } while (0) 178 179 #define PMCLOG_DESPATCH(PO) \ 180 pmclog_release((PO)); \ 181 spinlock_exit(); \ 182 } while (0) 183 184 #define PMCLOG_DESPATCH_SYNC(PO) \ 185 pmclog_schedule_io((PO), 1); \ 186 spinlock_exit(); \ 187 } while (0) 188 189 190 #define TSDELTA 4 191 /* 192 * Assertions about the log file format. 193 */ 194 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + 195 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 196 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); 197 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); 198 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 199 5*4 + sizeof(uintfptr_t)); 200 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 201 5*4 + TSDELTA + sizeof(uintfptr_t)); 202 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); 203 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); 204 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); 205 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); 206 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); 207 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); 208 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 209 sizeof(uintfptr_t) + TSDELTA); 210 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + 211 sizeof(uintfptr_t)); 212 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); 213 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); 214 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); 215 CTASSERT(sizeof(struct pmclog_userdata) == 6*4); 216 217 /* 218 * Log buffer structure 219 */ 220 221 struct pmclog_buffer { 222 TAILQ_ENTRY(pmclog_buffer) plb_next; 223 char *plb_base; 224 char *plb_ptr; 225 char *plb_fence; 226 uint16_t plb_domain; 227 } __aligned(CACHE_LINE_SIZE); 228 229 /* 230 * Prototypes 231 */ 232 233 static int pmclog_get_buffer(struct pmc_owner *po); 234 static void pmclog_loop(void *arg); 235 static void pmclog_release(struct pmc_owner *po); 236 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 237 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 238 static void pmclog_schedule_all(struct pmc_owner *po); 239 static void pmclog_stop_kthread(struct pmc_owner *po); 240 241 /* 242 * Helper functions 243 */ 244 245 static inline void 246 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 247 { 248 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 249 } 250 251 static inline void 252 pmc_plb_rele(struct pmclog_buffer *plb) 253 { 254 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 255 pmc_plb_rele_unlocked(plb); 256 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 257 } 258 259 /* 260 * Get a log buffer 261 */ 262 static int 263 pmclog_get_buffer(struct pmc_owner *po) 264 { 265 struct pmclog_buffer *plb; 266 int domain; 267 268 KASSERT(po->po_curbuf[curcpu] == NULL, 269 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 270 271 domain = curdomain; 272 MPASS(pmc_dom_hdrs[domain]); 273 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 274 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 275 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 276 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 277 278 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 279 280 #ifdef HWPMC_DEBUG 281 if (plb) 282 KASSERT(plb->plb_ptr == plb->plb_base && 283 plb->plb_base < plb->plb_fence, 284 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 285 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 286 plb->plb_base, plb->plb_fence)); 287 #endif 288 289 po->po_curbuf[curcpu] = plb; 290 291 /* update stats */ 292 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 293 if (plb == NULL) 294 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 295 296 return (plb ? 0 : ENOMEM); 297 } 298 299 struct pmclog_proc_init_args { 300 struct proc *kthr; 301 struct pmc_owner *po; 302 bool exit; 303 bool acted; 304 }; 305 306 int 307 pmclog_proc_create(struct thread *td, void **handlep) 308 { 309 struct pmclog_proc_init_args *ia; 310 int error; 311 312 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 313 error = kproc_create(pmclog_loop, ia, &ia->kthr, 314 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 315 if (error == 0) 316 *handlep = ia; 317 return (error); 318 } 319 320 void 321 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 322 { 323 struct pmclog_proc_init_args *ia; 324 325 ia = handle; 326 mtx_lock(&pmc_kthread_mtx); 327 MPASS(!ia->acted); 328 MPASS(ia->po == NULL); 329 MPASS(!ia->exit); 330 MPASS(ia->kthr != NULL); 331 if (po == NULL) { 332 ia->exit = true; 333 } else { 334 ia->po = po; 335 KASSERT(po->po_kthread == NULL, 336 ("[pmclog,%d] po=%p kthread (%p) already present", 337 __LINE__, po, po->po_kthread)); 338 po->po_kthread = ia->kthr; 339 } 340 wakeup(ia); 341 while (!ia->acted) 342 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 343 mtx_unlock(&pmc_kthread_mtx); 344 free(ia, M_TEMP); 345 } 346 347 /* 348 * Log handler loop. 349 * 350 * This function is executed by each pmc owner's helper thread. 351 */ 352 static void 353 pmclog_loop(void *arg) 354 { 355 struct pmclog_proc_init_args *ia; 356 struct pmc_owner *po; 357 struct pmclog_buffer *lb; 358 struct proc *p; 359 struct ucred *ownercred; 360 struct ucred *mycred; 361 struct thread *td; 362 sigset_t unb; 363 struct uio auio; 364 struct iovec aiov; 365 size_t nbytes; 366 int error; 367 368 td = curthread; 369 370 SIGEMPTYSET(unb); 371 SIGADDSET(unb, SIGHUP); 372 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 373 374 ia = arg; 375 MPASS(ia->kthr == curproc); 376 MPASS(!ia->acted); 377 mtx_lock(&pmc_kthread_mtx); 378 while (ia->po == NULL && !ia->exit) 379 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 380 if (ia->exit) { 381 ia->acted = true; 382 wakeup(ia); 383 mtx_unlock(&pmc_kthread_mtx); 384 kproc_exit(0); 385 } 386 MPASS(ia->po != NULL); 387 po = ia->po; 388 ia->acted = true; 389 wakeup(ia); 390 mtx_unlock(&pmc_kthread_mtx); 391 ia = NULL; 392 393 p = po->po_owner; 394 mycred = td->td_ucred; 395 396 PROC_LOCK(p); 397 ownercred = crhold(p->p_ucred); 398 PROC_UNLOCK(p); 399 400 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 401 KASSERT(po->po_kthread == curthread->td_proc, 402 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 403 po, po->po_kthread, curthread->td_proc)); 404 405 lb = NULL; 406 407 408 /* 409 * Loop waiting for I/O requests to be added to the owner 410 * struct's queue. The loop is exited when the log file 411 * is deconfigured. 412 */ 413 414 mtx_lock(&pmc_kthread_mtx); 415 416 for (;;) { 417 418 /* check if we've been asked to exit */ 419 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 420 break; 421 422 if (lb == NULL) { /* look for a fresh buffer to write */ 423 mtx_lock_spin(&po->po_mtx); 424 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 425 mtx_unlock_spin(&po->po_mtx); 426 427 /* No more buffers and shutdown required. */ 428 if (po->po_flags & PMC_PO_SHUTDOWN) 429 break; 430 431 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 432 "pmcloop", 250); 433 continue; 434 } 435 436 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 437 mtx_unlock_spin(&po->po_mtx); 438 } 439 440 mtx_unlock(&pmc_kthread_mtx); 441 442 /* process the request */ 443 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 444 lb->plb_base, lb->plb_ptr); 445 /* change our thread's credentials before issuing the I/O */ 446 447 aiov.iov_base = lb->plb_base; 448 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 449 450 auio.uio_iov = &aiov; 451 auio.uio_iovcnt = 1; 452 auio.uio_offset = -1; 453 auio.uio_resid = nbytes; 454 auio.uio_rw = UIO_WRITE; 455 auio.uio_segflg = UIO_SYSSPACE; 456 auio.uio_td = td; 457 458 /* switch thread credentials -- see kern_ktrace.c */ 459 td->td_ucred = ownercred; 460 error = fo_write(po->po_file, &auio, ownercred, 0, td); 461 td->td_ucred = mycred; 462 463 if (error) { 464 /* XXX some errors are recoverable */ 465 /* send a SIGIO to the owner and exit */ 466 PROC_LOCK(p); 467 kern_psignal(p, SIGIO); 468 PROC_UNLOCK(p); 469 470 mtx_lock(&pmc_kthread_mtx); 471 472 po->po_error = error; /* save for flush log */ 473 474 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 475 476 break; 477 } 478 479 mtx_lock(&pmc_kthread_mtx); 480 481 /* put the used buffer back into the global pool */ 482 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 483 484 pmc_plb_rele(lb); 485 lb = NULL; 486 } 487 488 wakeup_one(po->po_kthread); 489 po->po_kthread = NULL; 490 491 mtx_unlock(&pmc_kthread_mtx); 492 493 /* return the current I/O buffer to the global pool */ 494 if (lb) { 495 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 496 497 pmc_plb_rele(lb); 498 } 499 500 /* 501 * Exit this thread, signalling the waiter 502 */ 503 504 crfree(ownercred); 505 506 kproc_exit(0); 507 } 508 509 /* 510 * Release and log entry and schedule an I/O if needed. 511 */ 512 513 static void 514 pmclog_release_flags(struct pmc_owner *po, int wakeup) 515 { 516 struct pmclog_buffer *plb; 517 518 plb = po->po_curbuf[curcpu]; 519 KASSERT(plb->plb_ptr >= plb->plb_base, 520 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 521 po, plb->plb_ptr, plb->plb_base)); 522 KASSERT(plb->plb_ptr <= plb->plb_fence, 523 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 524 po, plb->plb_ptr, plb->plb_fence)); 525 526 /* schedule an I/O if we've filled a buffer */ 527 if (plb->plb_ptr >= plb->plb_fence) 528 pmclog_schedule_io(po, wakeup); 529 530 PMCDBG1(LOG,REL,1, "po=%p", po); 531 } 532 533 static void 534 pmclog_release(struct pmc_owner *po) 535 { 536 537 pmclog_release_flags(po, 1); 538 } 539 540 541 /* 542 * Attempt to reserve 'length' bytes of space in an owner's log 543 * buffer. The function returns a pointer to 'length' bytes of space 544 * if there was enough space or returns NULL if no space was 545 * available. Non-null returns do so with the po mutex locked. The 546 * caller must invoke pmclog_release() on the pmc owner structure 547 * when done. 548 */ 549 550 static uint32_t * 551 pmclog_reserve(struct pmc_owner *po, int length) 552 { 553 uintptr_t newptr, oldptr __diagused; 554 struct pmclog_buffer *plb, **pplb; 555 556 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 557 558 KASSERT(length % sizeof(uint32_t) == 0, 559 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 560 561 /* No more data when shutdown in progress. */ 562 if (po->po_flags & PMC_PO_SHUTDOWN) 563 return (NULL); 564 565 pplb = &po->po_curbuf[curcpu]; 566 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 567 goto fail; 568 569 KASSERT(*pplb != NULL, 570 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 571 572 plb = *pplb; 573 KASSERT(plb->plb_ptr >= plb->plb_base && 574 plb->plb_ptr <= plb->plb_fence, 575 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 576 __LINE__, po, plb->plb_ptr, plb->plb_base, 577 plb->plb_fence)); 578 579 oldptr = (uintptr_t) plb->plb_ptr; 580 newptr = oldptr + length; 581 582 KASSERT(oldptr != (uintptr_t) NULL, 583 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 584 585 /* 586 * If we have space in the current buffer, return a pointer to 587 * available space with the PO structure locked. 588 */ 589 if (newptr <= (uintptr_t) plb->plb_fence) { 590 plb->plb_ptr = (char *) newptr; 591 goto done; 592 } 593 594 /* 595 * Otherwise, schedule the current buffer for output and get a 596 * fresh buffer. 597 */ 598 pmclog_schedule_io(po, 0); 599 600 if (pmclog_get_buffer(po) != 0) 601 goto fail; 602 603 plb = *pplb; 604 KASSERT(plb != NULL, 605 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 606 607 KASSERT(plb->plb_ptr != NULL, 608 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 609 610 KASSERT(plb->plb_ptr == plb->plb_base && 611 plb->plb_ptr <= plb->plb_fence, 612 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 613 __LINE__, po, plb->plb_ptr, plb->plb_base, 614 plb->plb_fence)); 615 616 oldptr = (uintptr_t) plb->plb_ptr; 617 618 done: 619 return ((uint32_t *) oldptr); 620 fail: 621 return (NULL); 622 } 623 624 /* 625 * Schedule an I/O. 626 * 627 * Transfer the current buffer to the helper kthread. 628 */ 629 630 static void 631 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 632 { 633 struct pmclog_buffer *plb; 634 635 plb = po->po_curbuf[curcpu]; 636 po->po_curbuf[curcpu] = NULL; 637 KASSERT(plb != NULL, 638 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 639 KASSERT(plb->plb_ptr >= plb->plb_base, 640 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 641 po, plb->plb_ptr, plb->plb_base)); 642 KASSERT(plb->plb_ptr <= plb->plb_fence, 643 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 644 po, plb->plb_ptr, plb->plb_fence)); 645 646 PMCDBG1(LOG,SIO, 1, "po=%p", po); 647 648 /* 649 * Add the current buffer to the tail of the buffer list and 650 * wakeup the helper. 651 */ 652 mtx_lock_spin(&po->po_mtx); 653 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 654 mtx_unlock_spin(&po->po_mtx); 655 if (wakeup) 656 wakeup_one(po); 657 } 658 659 /* 660 * Stop the helper kthread. 661 */ 662 663 static void 664 pmclog_stop_kthread(struct pmc_owner *po) 665 { 666 667 mtx_lock(&pmc_kthread_mtx); 668 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 669 if (po->po_kthread != NULL) { 670 PROC_LOCK(po->po_kthread); 671 kern_psignal(po->po_kthread, SIGHUP); 672 PROC_UNLOCK(po->po_kthread); 673 } 674 wakeup_one(po); 675 while (po->po_kthread) 676 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 677 mtx_unlock(&pmc_kthread_mtx); 678 } 679 680 /* 681 * Public functions 682 */ 683 684 /* 685 * Configure a log file for pmc owner 'po'. 686 * 687 * Parameter 'logfd' is a file handle referencing an open file in the 688 * owner process. This file needs to have been opened for writing. 689 */ 690 691 int 692 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 693 { 694 struct proc *p; 695 struct timespec ts; 696 int error; 697 698 sx_assert(&pmc_sx, SA_XLOCKED); 699 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 700 701 p = po->po_owner; 702 703 /* return EBUSY if a log file was already present */ 704 if (po->po_flags & PMC_PO_OWNS_LOGFILE) 705 return (EBUSY); 706 707 KASSERT(po->po_file == NULL, 708 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 709 po->po_file)); 710 711 /* get a reference to the file state */ 712 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); 713 if (error) 714 goto error; 715 716 /* mark process as owning a log file */ 717 po->po_flags |= PMC_PO_OWNS_LOGFILE; 718 719 /* mark process as using HWPMCs */ 720 PROC_LOCK(p); 721 p->p_flag |= P_HWPMC; 722 PROC_UNLOCK(p); 723 nanotime(&ts); 724 /* create a log initialization entry */ 725 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE, 726 sizeof(struct pmclog_initialize)); 727 PMCLOG_EMIT32(PMC_VERSION); 728 PMCLOG_EMIT32(md->pmd_cputype); 729 #if defined(__i386__) || defined(__amd64__) 730 PMCLOG_EMIT64(tsc_freq); 731 #else 732 /* other architectures will need to fill this in */ 733 PMCLOG_EMIT32(0); 734 PMCLOG_EMIT32(0); 735 #endif 736 memcpy(_le, &ts, sizeof(ts)); 737 _le += sizeof(ts)/4; 738 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 739 PMCLOG_DESPATCH_SYNC(po); 740 741 return (0); 742 743 error: 744 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 745 "stopped", __LINE__, po)); 746 747 if (po->po_file) 748 (void) fdrop(po->po_file, curthread); 749 po->po_file = NULL; /* clear file and error state */ 750 po->po_error = 0; 751 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 752 753 return (error); 754 } 755 756 757 /* 758 * De-configure a log file. This will throw away any buffers queued 759 * for this owner process. 760 */ 761 762 int 763 pmclog_deconfigure_log(struct pmc_owner *po) 764 { 765 int error; 766 struct pmclog_buffer *lb; 767 struct pmc_binding pb; 768 769 PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 770 771 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 772 return (EINVAL); 773 774 KASSERT(po->po_sscount == 0, 775 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 776 KASSERT(po->po_file != NULL, 777 ("[pmclog,%d] po=%p no log file", __LINE__, po)); 778 779 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 780 pmclog_stop_kthread(po); 781 782 KASSERT(po->po_kthread == NULL, 783 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 784 785 /* return all queued log buffers to the global pool */ 786 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 787 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 788 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 789 pmc_plb_rele(lb); 790 } 791 pmc_save_cpu_binding(&pb); 792 for (int i = 0; i < mp_ncpus; i++) { 793 pmc_select_cpu(i); 794 /* return the 'current' buffer to the global pool */ 795 if ((lb = po->po_curbuf[curcpu]) != NULL) { 796 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 797 pmc_plb_rele(lb); 798 } 799 } 800 pmc_restore_cpu_binding(&pb); 801 802 /* drop a reference to the fd */ 803 if (po->po_file != NULL) { 804 error = fdrop(po->po_file, curthread); 805 po->po_file = NULL; 806 } else 807 error = 0; 808 po->po_error = 0; 809 810 return (error); 811 } 812 813 /* 814 * Flush a process' log buffer. 815 */ 816 817 int 818 pmclog_flush(struct pmc_owner *po, int force) 819 { 820 int error; 821 822 PMCDBG1(LOG,FLS,1, "po=%p", po); 823 824 /* 825 * If there is a pending error recorded by the logger thread, 826 * return that. 827 */ 828 if (po->po_error) 829 return (po->po_error); 830 831 error = 0; 832 833 /* 834 * Check that we do have an active log file. 835 */ 836 mtx_lock(&pmc_kthread_mtx); 837 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 838 error = EINVAL; 839 goto error; 840 } 841 842 pmclog_schedule_all(po); 843 error: 844 mtx_unlock(&pmc_kthread_mtx); 845 846 return (error); 847 } 848 849 static void 850 pmclog_schedule_one_cond(struct pmc_owner *po) 851 { 852 struct pmclog_buffer *plb; 853 int cpu; 854 855 spinlock_enter(); 856 cpu = curcpu; 857 /* tell hardclock not to run again */ 858 if (PMC_CPU_HAS_SAMPLES(cpu)) 859 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 860 861 plb = po->po_curbuf[cpu]; 862 if (plb && plb->plb_ptr != plb->plb_base) 863 pmclog_schedule_io(po, 1); 864 spinlock_exit(); 865 } 866 867 static void 868 pmclog_schedule_all(struct pmc_owner *po) 869 { 870 struct pmc_binding pb; 871 872 /* 873 * Schedule the current buffer if any and not empty. 874 */ 875 pmc_save_cpu_binding(&pb); 876 for (int i = 0; i < mp_ncpus; i++) { 877 pmc_select_cpu(i); 878 pmclog_schedule_one_cond(po); 879 } 880 pmc_restore_cpu_binding(&pb); 881 } 882 883 int 884 pmclog_close(struct pmc_owner *po) 885 { 886 887 PMCDBG1(LOG,CLO,1, "po=%p", po); 888 889 pmclog_process_closelog(po); 890 891 mtx_lock(&pmc_kthread_mtx); 892 /* 893 * Initiate shutdown: no new data queued, 894 * thread will close file on last block. 895 */ 896 po->po_flags |= PMC_PO_SHUTDOWN; 897 /* give time for all to see */ 898 DELAY(50); 899 900 /* 901 * Schedule the current buffer. 902 */ 903 pmclog_schedule_all(po); 904 wakeup_one(po); 905 906 mtx_unlock(&pmc_kthread_mtx); 907 908 return (0); 909 } 910 911 void 912 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 913 { 914 int n, recordlen; 915 uint32_t flags; 916 struct pmc_owner *po; 917 918 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 919 ps->ps_nsamples); 920 921 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 922 ps->ps_nsamples * sizeof(uintfptr_t); 923 po = pm->pm_owner; 924 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 925 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc); 926 PMCLOG_EMIT32(ps->ps_pid); 927 PMCLOG_EMIT32(ps->ps_tid); 928 PMCLOG_EMIT32(pm->pm_id); 929 PMCLOG_EMIT32(flags); 930 for (n = 0; n < ps->ps_nsamples; n++) 931 PMCLOG_EMITADDR(ps->ps_pc[n]); 932 PMCLOG_DESPATCH_SAFE(po); 933 } 934 935 void 936 pmclog_process_closelog(struct pmc_owner *po) 937 { 938 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog)); 939 PMCLOG_DESPATCH_SYNC(po); 940 } 941 942 void 943 pmclog_process_dropnotify(struct pmc_owner *po) 944 { 945 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify)); 946 PMCLOG_DESPATCH(po); 947 } 948 949 void 950 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 951 const char *path) 952 { 953 int pathlen, recordlen; 954 955 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 956 957 pathlen = strlen(path) + 1; /* #bytes for path name */ 958 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 959 pathlen; 960 961 PMCLOG_RESERVE(po, MAP_IN, recordlen); 962 PMCLOG_EMIT32(pid); 963 PMCLOG_EMIT32(0); 964 PMCLOG_EMITADDR(start); 965 PMCLOG_EMITSTRING(path,pathlen); 966 PMCLOG_DESPATCH_SYNC(po); 967 } 968 969 void 970 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 971 uintfptr_t end) 972 { 973 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 974 975 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out)); 976 PMCLOG_EMIT32(pid); 977 PMCLOG_EMIT32(0); 978 PMCLOG_EMITADDR(start); 979 PMCLOG_EMITADDR(end); 980 PMCLOG_DESPATCH(po); 981 } 982 983 void 984 pmclog_process_pmcallocate(struct pmc *pm) 985 { 986 struct pmc_owner *po; 987 struct pmc_soft *ps; 988 989 po = pm->pm_owner; 990 991 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 992 993 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 994 PMCLOG_RESERVE(po, PMCALLOCATEDYN, 995 sizeof(struct pmclog_pmcallocatedyn)); 996 PMCLOG_EMIT32(pm->pm_id); 997 PMCLOG_EMIT32(pm->pm_event); 998 PMCLOG_EMIT32(pm->pm_flags); 999 PMCLOG_EMIT32(0); 1000 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1001 ps = pmc_soft_ev_acquire(pm->pm_event); 1002 if (ps != NULL) 1003 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 1004 else 1005 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 1006 pmc_soft_ev_release(ps); 1007 PMCLOG_DESPATCH_SYNC(po); 1008 } else { 1009 PMCLOG_RESERVE(po, PMCALLOCATE, 1010 sizeof(struct pmclog_pmcallocate)); 1011 PMCLOG_EMIT32(pm->pm_id); 1012 PMCLOG_EMIT32(pm->pm_event); 1013 PMCLOG_EMIT32(pm->pm_flags); 1014 PMCLOG_EMIT32(0); 1015 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1016 PMCLOG_DESPATCH_SYNC(po); 1017 } 1018 } 1019 1020 void 1021 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 1022 { 1023 int pathlen, recordlen; 1024 struct pmc_owner *po; 1025 1026 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 1027 1028 po = pm->pm_owner; 1029 1030 pathlen = strlen(path) + 1; /* #bytes for the string */ 1031 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 1032 1033 PMCLOG_RESERVE(po, PMCATTACH, recordlen); 1034 PMCLOG_EMIT32(pm->pm_id); 1035 PMCLOG_EMIT32(pid); 1036 PMCLOG_EMITSTRING(path, pathlen); 1037 PMCLOG_DESPATCH_SYNC(po); 1038 } 1039 1040 void 1041 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 1042 { 1043 struct pmc_owner *po; 1044 1045 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 1046 1047 po = pm->pm_owner; 1048 1049 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach)); 1050 PMCLOG_EMIT32(pm->pm_id); 1051 PMCLOG_EMIT32(pid); 1052 PMCLOG_DESPATCH_SYNC(po); 1053 } 1054 1055 void 1056 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1057 { 1058 if (sync) { 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_SYNC(po); 1064 } else { 1065 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate)); 1066 PMCLOG_EMIT32(p->p_pid); 1067 PMCLOG_EMIT32(p->p_flag); 1068 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1069 PMCLOG_DESPATCH(po); 1070 } 1071 } 1072 1073 /* 1074 * Log a context switch event to the log file. 1075 */ 1076 1077 void 1078 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td) 1079 { 1080 struct pmc_owner *po; 1081 1082 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW, 1083 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__)); 1084 1085 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1086 v); 1087 1088 po = pm->pm_owner; 1089 1090 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc()); 1091 PMCLOG_EMIT64(v); 1092 PMCLOG_EMIT32(pm->pm_id); 1093 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1094 PMCLOG_EMIT32(td->td_tid); 1095 PMCLOG_EMIT32(0); 1096 PMCLOG_DESPATCH_SCHED_LOCK(po); 1097 } 1098 1099 void 1100 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1101 uintfptr_t startaddr, char *path) 1102 { 1103 int pathlen, recordlen; 1104 1105 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1106 1107 pathlen = strlen(path) + 1; /* #bytes for the path */ 1108 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1109 PMCLOG_RESERVE(po, PROCEXEC, recordlen); 1110 PMCLOG_EMIT32(pid); 1111 PMCLOG_EMIT32(pmid); 1112 PMCLOG_EMITADDR(startaddr); 1113 PMCLOG_EMITSTRING(path,pathlen); 1114 PMCLOG_DESPATCH_SYNC(po); 1115 } 1116 1117 /* 1118 * Log a process exit event (and accumulated pmc value) to the log file. 1119 */ 1120 1121 void 1122 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1123 { 1124 int ri; 1125 struct pmc_owner *po; 1126 1127 ri = PMC_TO_ROWINDEX(pm); 1128 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1129 pp->pp_pmcs[ri].pp_pmcval); 1130 1131 po = pm->pm_owner; 1132 1133 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit)); 1134 PMCLOG_EMIT32(pm->pm_id); 1135 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1136 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1137 PMCLOG_DESPATCH(po); 1138 } 1139 1140 /* 1141 * Log a fork event. 1142 */ 1143 1144 void 1145 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1146 { 1147 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork)); 1148 PMCLOG_EMIT32(oldpid); 1149 PMCLOG_EMIT32(newpid); 1150 PMCLOG_DESPATCH(po); 1151 } 1152 1153 /* 1154 * Log a process exit event of the form suitable for system-wide PMCs. 1155 */ 1156 1157 void 1158 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1159 { 1160 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit)); 1161 PMCLOG_EMIT32(pid); 1162 PMCLOG_DESPATCH(po); 1163 } 1164 1165 void 1166 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1167 { 1168 struct proc *p; 1169 1170 p = td->td_proc; 1171 if (sync) { 1172 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1173 PMCLOG_EMIT32(td->td_tid); 1174 PMCLOG_EMIT32(p->p_pid); 1175 PMCLOG_EMIT32(p->p_flag); 1176 PMCLOG_EMIT32(0); 1177 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1178 PMCLOG_DESPATCH_SYNC(po); 1179 } else { 1180 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate)); 1181 PMCLOG_EMIT32(td->td_tid); 1182 PMCLOG_EMIT32(p->p_pid); 1183 PMCLOG_EMIT32(p->p_flag); 1184 PMCLOG_EMIT32(0); 1185 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1186 PMCLOG_DESPATCH(po); 1187 } 1188 } 1189 1190 void 1191 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td) 1192 { 1193 1194 PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit)); 1195 PMCLOG_EMIT32(td->td_tid); 1196 PMCLOG_DESPATCH(po); 1197 } 1198 1199 /* 1200 * Write a user log entry. 1201 */ 1202 1203 int 1204 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1205 { 1206 int error; 1207 1208 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1209 1210 error = 0; 1211 1212 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA, 1213 sizeof(struct pmclog_userdata)); 1214 PMCLOG_EMIT32(wl->pm_userdata); 1215 PMCLOG_DESPATCH(po); 1216 1217 error: 1218 return (error); 1219 } 1220 1221 /* 1222 * Initialization. 1223 * 1224 * Create a pool of log buffers and initialize mutexes. 1225 */ 1226 1227 void 1228 pmclog_initialize(void) 1229 { 1230 struct pmclog_buffer *plb; 1231 int domain, ncpus, total; 1232 1233 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1234 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1235 "greater than zero and less than or equal to 16MB.\n", 1236 pmclog_buffer_size); 1237 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1238 } 1239 1240 if (pmc_nlogbuffers_pcpu <= 0) { 1241 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1242 "than zero.\n", pmc_nlogbuffers_pcpu); 1243 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1244 } 1245 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1246 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1247 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1248 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1249 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1250 } 1251 for (domain = 0; domain < vm_ndomains; domain++) { 1252 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1253 total = ncpus * pmc_nlogbuffers_pcpu; 1254 1255 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total, 1256 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1257 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1258 for (; total > 0; total--, plb++) { 1259 void *buf; 1260 1261 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC, 1262 DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1263 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); 1264 pmc_plb_rele_unlocked(plb); 1265 } 1266 } 1267 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1268 } 1269 1270 /* 1271 * Shutdown logging. 1272 * 1273 * Destroy mutexes and release memory back the to free pool. 1274 */ 1275 1276 void 1277 pmclog_shutdown(void) 1278 { 1279 struct pmclog_buffer *plb; 1280 int domain; 1281 1282 mtx_destroy(&pmc_kthread_mtx); 1283 1284 for (domain = 0; domain < vm_ndomains; domain++) { 1285 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { 1286 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 1287 free(plb->plb_base, M_PMC); 1288 } 1289 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); 1290 } 1291 } 1292