1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 40 #include <sys/capsicum.h> 41 #include <sys/domainset.h> 42 #include <sys/file.h> 43 #include <sys/kernel.h> 44 #include <sys/kthread.h> 45 #include <sys/lock.h> 46 #include <sys/module.h> 47 #include <sys/mutex.h> 48 #include <sys/pmc.h> 49 #include <sys/pmckern.h> 50 #include <sys/pmclog.h> 51 #include <sys/proc.h> 52 #include <sys/sched.h> 53 #include <sys/signalvar.h> 54 #include <sys/smp.h> 55 #include <sys/syscallsubr.h> 56 #include <sys/sysctl.h> 57 #include <sys/systm.h> 58 #include <sys/uio.h> 59 #include <sys/unistd.h> 60 #include <sys/vnode.h> 61 62 #if defined(__i386__) || defined(__amd64__) 63 #include <machine/clock.h> 64 #endif 65 66 #define curdomain PCPU_GET(domain) 67 68 /* 69 * Sysctl tunables 70 */ 71 72 SYSCTL_DECL(_kern_hwpmc); 73 74 /* 75 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers. 76 */ 77 78 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 79 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN, 80 &pmclog_buffer_size, 0, "size of log buffers in kilobytes"); 81 82 /* 83 * kern.hwpmc.nbuffers_pcpu -- number of global log buffers 84 */ 85 86 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 87 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN, 88 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu"); 89 90 /* 91 * Global log buffer list and associated spin lock. 92 */ 93 94 static struct mtx pmc_kthread_mtx; /* sleep lock */ 95 96 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \ 97 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \ 98 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \ 99 (D)->plb_domain = domain; \ 100 } while (0) 101 102 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \ 103 (D)->plb_ptr = (D)->plb_base; \ 104 } while (0) 105 106 /* 107 * Log file record constructors. 108 */ 109 #define _PMCLOG_TO_HEADER(T,L) \ 110 ((PMCLOG_HEADER_MAGIC << 24) | (T << 16) | ((L) & 0xFFFF)) 111 112 /* reserve LEN bytes of space and initialize the entry header */ 113 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \ 114 uint32_t *_le; \ 115 int _len = roundup((LEN), sizeof(uint32_t)); \ 116 struct pmclog_header *ph; \ 117 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 118 ACTION; \ 119 } \ 120 ph = (struct pmclog_header *)_le; \ 121 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 122 ph->pl_tsc = (TSC); \ 123 _le += sizeof(*ph)/4 /* skip over timestamp */ 124 125 /* reserve LEN bytes of space and initialize the entry header */ 126 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \ 127 uint32_t *_le; \ 128 int _len = roundup((LEN), sizeof(uint32_t)); \ 129 uint64_t tsc; \ 130 struct pmclog_header *ph; \ 131 tsc = pmc_rdtsc(); \ 132 spinlock_enter(); \ 133 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \ 134 spinlock_exit(); \ 135 ACTION; \ 136 } \ 137 ph = (struct pmclog_header *)_le; \ 138 ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \ 139 ph->pl_tsc = tsc; \ 140 _le += sizeof(*ph)/4 /* skip over timestamp */ 141 142 143 144 #define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC) 145 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return) 146 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \ 147 error=ENOMEM;goto error) 148 149 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0) 150 #define PMCLOG_EMIT64(V) do { \ 151 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \ 152 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \ 153 } while (0) 154 155 156 /* Emit a string. Caution: does NOT update _le, so needs to be last */ 157 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0) 158 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0) 159 160 #define PMCLOG_DESPATCH_SAFE(PO) \ 161 pmclog_release((PO)); \ 162 } while (0) 163 164 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \ 165 pmclog_release_flags((PO), 0); \ 166 } while (0) 167 168 #define PMCLOG_DESPATCH(PO) \ 169 pmclog_release((PO)); \ 170 spinlock_exit(); \ 171 } while (0) 172 173 #define PMCLOG_DESPATCH_SYNC(PO) \ 174 pmclog_schedule_io((PO), 1); \ 175 spinlock_exit(); \ 176 } while (0) 177 178 179 #define TSDELTA 4 180 /* 181 * Assertions about the log file format. 182 */ 183 CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA + 184 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t)); 185 CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA); 186 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA); 187 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA + 188 5*4 + sizeof(uintfptr_t)); 189 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) == 190 5*4 + TSDELTA + sizeof(uintfptr_t)); 191 CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA); 192 CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA); 193 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA); 194 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA); 195 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA); 196 CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA); 197 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX + 198 2*sizeof(uintptr_t) + TSDELTA); 199 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA + 200 2*sizeof(uintptr_t)); 201 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA); 202 CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA); 203 CTASSERT(sizeof(struct pmclog_sysexit) == 6*4); 204 CTASSERT(sizeof(struct pmclog_userdata) == 6*4); 205 206 /* 207 * Log buffer structure 208 */ 209 210 struct pmclog_buffer { 211 TAILQ_ENTRY(pmclog_buffer) plb_next; 212 char *plb_base; 213 char *plb_ptr; 214 char *plb_fence; 215 uint16_t plb_domain; 216 } __aligned(CACHE_LINE_SIZE); 217 218 /* 219 * Prototypes 220 */ 221 222 static int pmclog_get_buffer(struct pmc_owner *po); 223 static void pmclog_loop(void *arg); 224 static void pmclog_release(struct pmc_owner *po); 225 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length); 226 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup); 227 static void pmclog_schedule_all(struct pmc_owner *po); 228 static void pmclog_stop_kthread(struct pmc_owner *po); 229 230 /* 231 * Helper functions 232 */ 233 234 static inline void 235 pmc_plb_rele_unlocked(struct pmclog_buffer *plb) 236 { 237 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next); 238 } 239 240 static inline void 241 pmc_plb_rele(struct pmclog_buffer *plb) 242 { 243 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 244 pmc_plb_rele_unlocked(plb); 245 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx); 246 } 247 248 /* 249 * Get a log buffer 250 */ 251 static int 252 pmclog_get_buffer(struct pmc_owner *po) 253 { 254 struct pmclog_buffer *plb; 255 int domain; 256 257 KASSERT(po->po_curbuf[curcpu] == NULL, 258 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po)); 259 260 domain = curdomain; 261 MPASS(pmc_dom_hdrs[domain]); 262 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 263 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) 264 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 265 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx); 266 267 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb); 268 269 #ifdef HWPMC_DEBUG 270 if (plb) 271 KASSERT(plb->plb_ptr == plb->plb_base && 272 plb->plb_base < plb->plb_fence, 273 ("[pmclog,%d] po=%p buffer invariants: ptr=%p " 274 "base=%p fence=%p", __LINE__, po, plb->plb_ptr, 275 plb->plb_base, plb->plb_fence)); 276 #endif 277 278 po->po_curbuf[curcpu] = plb; 279 280 /* update stats */ 281 counter_u64_add(pmc_stats.pm_buffer_requests, 1); 282 if (plb == NULL) 283 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1); 284 285 return (plb ? 0 : ENOMEM); 286 } 287 288 struct pmclog_proc_init_args { 289 struct proc *kthr; 290 struct pmc_owner *po; 291 bool exit; 292 bool acted; 293 }; 294 295 int 296 pmclog_proc_create(struct thread *td, void **handlep) 297 { 298 struct pmclog_proc_init_args *ia; 299 int error; 300 301 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO); 302 error = kproc_create(pmclog_loop, ia, &ia->kthr, 303 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid); 304 if (error == 0) 305 *handlep = ia; 306 return (error); 307 } 308 309 void 310 pmclog_proc_ignite(void *handle, struct pmc_owner *po) 311 { 312 struct pmclog_proc_init_args *ia; 313 314 ia = handle; 315 mtx_lock(&pmc_kthread_mtx); 316 MPASS(!ia->acted); 317 MPASS(ia->po == NULL); 318 MPASS(!ia->exit); 319 MPASS(ia->kthr != NULL); 320 if (po == NULL) { 321 ia->exit = true; 322 } else { 323 ia->po = po; 324 KASSERT(po->po_kthread == NULL, 325 ("[pmclog,%d] po=%p kthread (%p) already present", 326 __LINE__, po, po->po_kthread)); 327 po->po_kthread = ia->kthr; 328 } 329 wakeup(ia); 330 while (!ia->acted) 331 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0); 332 mtx_unlock(&pmc_kthread_mtx); 333 free(ia, M_TEMP); 334 } 335 336 /* 337 * Log handler loop. 338 * 339 * This function is executed by each pmc owner's helper thread. 340 */ 341 static void 342 pmclog_loop(void *arg) 343 { 344 struct pmclog_proc_init_args *ia; 345 struct pmc_owner *po; 346 struct pmclog_buffer *lb; 347 struct proc *p; 348 struct ucred *ownercred; 349 struct ucred *mycred; 350 struct thread *td; 351 sigset_t unb; 352 struct uio auio; 353 struct iovec aiov; 354 size_t nbytes; 355 int error; 356 357 td = curthread; 358 359 SIGEMPTYSET(unb); 360 SIGADDSET(unb, SIGHUP); 361 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0); 362 363 ia = arg; 364 MPASS(ia->kthr == curproc); 365 MPASS(!ia->acted); 366 mtx_lock(&pmc_kthread_mtx); 367 while (ia->po == NULL && !ia->exit) 368 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0); 369 if (ia->exit) { 370 ia->acted = true; 371 wakeup(ia); 372 mtx_unlock(&pmc_kthread_mtx); 373 kproc_exit(0); 374 } 375 MPASS(ia->po != NULL); 376 po = ia->po; 377 ia->acted = true; 378 wakeup(ia); 379 mtx_unlock(&pmc_kthread_mtx); 380 ia = NULL; 381 382 p = po->po_owner; 383 mycred = td->td_ucred; 384 385 PROC_LOCK(p); 386 ownercred = crhold(p->p_ucred); 387 PROC_UNLOCK(p); 388 389 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread); 390 KASSERT(po->po_kthread == curthread->td_proc, 391 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__, 392 po, po->po_kthread, curthread->td_proc)); 393 394 lb = NULL; 395 396 397 /* 398 * Loop waiting for I/O requests to be added to the owner 399 * struct's queue. The loop is exited when the log file 400 * is deconfigured. 401 */ 402 403 mtx_lock(&pmc_kthread_mtx); 404 405 for (;;) { 406 407 /* check if we've been asked to exit */ 408 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 409 break; 410 411 if (lb == NULL) { /* look for a fresh buffer to write */ 412 mtx_lock_spin(&po->po_mtx); 413 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) { 414 mtx_unlock_spin(&po->po_mtx); 415 416 /* No more buffers and shutdown required. */ 417 if (po->po_flags & PMC_PO_SHUTDOWN) 418 break; 419 420 (void) msleep(po, &pmc_kthread_mtx, PWAIT, 421 "pmcloop", 250); 422 continue; 423 } 424 425 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 426 mtx_unlock_spin(&po->po_mtx); 427 } 428 429 mtx_unlock(&pmc_kthread_mtx); 430 431 /* process the request */ 432 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po, 433 lb->plb_base, lb->plb_ptr); 434 /* change our thread's credentials before issuing the I/O */ 435 436 aiov.iov_base = lb->plb_base; 437 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base; 438 439 auio.uio_iov = &aiov; 440 auio.uio_iovcnt = 1; 441 auio.uio_offset = -1; 442 auio.uio_resid = nbytes; 443 auio.uio_rw = UIO_WRITE; 444 auio.uio_segflg = UIO_SYSSPACE; 445 auio.uio_td = td; 446 447 /* switch thread credentials -- see kern_ktrace.c */ 448 td->td_ucred = ownercred; 449 error = fo_write(po->po_file, &auio, ownercred, 0, td); 450 td->td_ucred = mycred; 451 452 if (error) { 453 /* XXX some errors are recoverable */ 454 /* send a SIGIO to the owner and exit */ 455 PROC_LOCK(p); 456 kern_psignal(p, SIGIO); 457 PROC_UNLOCK(p); 458 459 mtx_lock(&pmc_kthread_mtx); 460 461 po->po_error = error; /* save for flush log */ 462 463 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error); 464 465 break; 466 } 467 468 mtx_lock(&pmc_kthread_mtx); 469 470 /* put the used buffer back into the global pool */ 471 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 472 473 pmc_plb_rele(lb); 474 lb = NULL; 475 } 476 477 wakeup_one(po->po_kthread); 478 po->po_kthread = NULL; 479 480 mtx_unlock(&pmc_kthread_mtx); 481 482 /* return the current I/O buffer to the global pool */ 483 if (lb) { 484 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 485 486 pmc_plb_rele(lb); 487 } 488 489 /* 490 * Exit this thread, signalling the waiter 491 */ 492 493 crfree(ownercred); 494 495 kproc_exit(0); 496 } 497 498 /* 499 * Release and log entry and schedule an I/O if needed. 500 */ 501 502 static void 503 pmclog_release_flags(struct pmc_owner *po, int wakeup) 504 { 505 struct pmclog_buffer *plb; 506 507 plb = po->po_curbuf[curcpu]; 508 KASSERT(plb->plb_ptr >= plb->plb_base, 509 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 510 po, plb->plb_ptr, plb->plb_base)); 511 KASSERT(plb->plb_ptr <= plb->plb_fence, 512 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 513 po, plb->plb_ptr, plb->plb_fence)); 514 515 /* schedule an I/O if we've filled a buffer */ 516 if (plb->plb_ptr >= plb->plb_fence) 517 pmclog_schedule_io(po, wakeup); 518 519 PMCDBG1(LOG,REL,1, "po=%p", po); 520 } 521 522 static void 523 pmclog_release(struct pmc_owner *po) 524 { 525 526 pmclog_release_flags(po, 1); 527 } 528 529 530 /* 531 * Attempt to reserve 'length' bytes of space in an owner's log 532 * buffer. The function returns a pointer to 'length' bytes of space 533 * if there was enough space or returns NULL if no space was 534 * available. Non-null returns do so with the po mutex locked. The 535 * caller must invoke pmclog_release() on the pmc owner structure 536 * when done. 537 */ 538 539 static uint32_t * 540 pmclog_reserve(struct pmc_owner *po, int length) 541 { 542 uintptr_t newptr, oldptr __diagused; 543 struct pmclog_buffer *plb, **pplb; 544 545 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length); 546 547 KASSERT(length % sizeof(uint32_t) == 0, 548 ("[pmclog,%d] length not a multiple of word size", __LINE__)); 549 550 /* No more data when shutdown in progress. */ 551 if (po->po_flags & PMC_PO_SHUTDOWN) 552 return (NULL); 553 554 pplb = &po->po_curbuf[curcpu]; 555 if (*pplb == NULL && pmclog_get_buffer(po) != 0) 556 goto fail; 557 558 KASSERT(*pplb != NULL, 559 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 560 561 plb = *pplb; 562 KASSERT(plb->plb_ptr >= plb->plb_base && 563 plb->plb_ptr <= plb->plb_fence, 564 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 565 __LINE__, po, plb->plb_ptr, plb->plb_base, 566 plb->plb_fence)); 567 568 oldptr = (uintptr_t) plb->plb_ptr; 569 newptr = oldptr + length; 570 571 KASSERT(oldptr != (uintptr_t) NULL, 572 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po)); 573 574 /* 575 * If we have space in the current buffer, return a pointer to 576 * available space with the PO structure locked. 577 */ 578 if (newptr <= (uintptr_t) plb->plb_fence) { 579 plb->plb_ptr = (char *) newptr; 580 goto done; 581 } 582 583 /* 584 * Otherwise, schedule the current buffer for output and get a 585 * fresh buffer. 586 */ 587 pmclog_schedule_io(po, 0); 588 589 if (pmclog_get_buffer(po) != 0) 590 goto fail; 591 592 plb = *pplb; 593 KASSERT(plb != NULL, 594 ("[pmclog,%d] po=%p no current buffer", __LINE__, po)); 595 596 KASSERT(plb->plb_ptr != NULL, 597 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__)); 598 599 KASSERT(plb->plb_ptr == plb->plb_base && 600 plb->plb_ptr <= plb->plb_fence, 601 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p", 602 __LINE__, po, plb->plb_ptr, plb->plb_base, 603 plb->plb_fence)); 604 605 oldptr = (uintptr_t) plb->plb_ptr; 606 607 done: 608 return ((uint32_t *) oldptr); 609 fail: 610 return (NULL); 611 } 612 613 /* 614 * Schedule an I/O. 615 * 616 * Transfer the current buffer to the helper kthread. 617 */ 618 619 static void 620 pmclog_schedule_io(struct pmc_owner *po, int wakeup) 621 { 622 struct pmclog_buffer *plb; 623 624 plb = po->po_curbuf[curcpu]; 625 po->po_curbuf[curcpu] = NULL; 626 KASSERT(plb != NULL, 627 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po)); 628 KASSERT(plb->plb_ptr >= plb->plb_base, 629 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__, 630 po, plb->plb_ptr, plb->plb_base)); 631 KASSERT(plb->plb_ptr <= plb->plb_fence, 632 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__, 633 po, plb->plb_ptr, plb->plb_fence)); 634 635 PMCDBG1(LOG,SIO, 1, "po=%p", po); 636 637 /* 638 * Add the current buffer to the tail of the buffer list and 639 * wakeup the helper. 640 */ 641 mtx_lock_spin(&po->po_mtx); 642 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next); 643 mtx_unlock_spin(&po->po_mtx); 644 if (wakeup) 645 wakeup_one(po); 646 } 647 648 /* 649 * Stop the helper kthread. 650 */ 651 652 static void 653 pmclog_stop_kthread(struct pmc_owner *po) 654 { 655 656 mtx_lock(&pmc_kthread_mtx); 657 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 658 if (po->po_kthread != NULL) { 659 PROC_LOCK(po->po_kthread); 660 kern_psignal(po->po_kthread, SIGHUP); 661 PROC_UNLOCK(po->po_kthread); 662 } 663 wakeup_one(po); 664 while (po->po_kthread) 665 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0); 666 mtx_unlock(&pmc_kthread_mtx); 667 } 668 669 /* 670 * Public functions 671 */ 672 673 /* 674 * Configure a log file for pmc owner 'po'. 675 * 676 * Parameter 'logfd' is a file handle referencing an open file in the 677 * owner process. This file needs to have been opened for writing. 678 */ 679 680 int 681 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd) 682 { 683 struct proc *p; 684 struct timespec ts; 685 int error; 686 687 sx_assert(&pmc_sx, SA_XLOCKED); 688 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd); 689 690 p = po->po_owner; 691 692 /* return EBUSY if a log file was already present */ 693 if (po->po_flags & PMC_PO_OWNS_LOGFILE) 694 return (EBUSY); 695 696 KASSERT(po->po_file == NULL, 697 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po, 698 po->po_file)); 699 700 /* get a reference to the file state */ 701 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file); 702 if (error) 703 goto error; 704 705 /* mark process as owning a log file */ 706 po->po_flags |= PMC_PO_OWNS_LOGFILE; 707 708 /* mark process as using HWPMCs */ 709 PROC_LOCK(p); 710 p->p_flag |= P_HWPMC; 711 PROC_UNLOCK(p); 712 nanotime(&ts); 713 /* create a log initialization entry */ 714 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_INITIALIZE, 715 sizeof(struct pmclog_initialize)); 716 PMCLOG_EMIT32(PMC_VERSION); 717 PMCLOG_EMIT32(md->pmd_cputype); 718 #if defined(__i386__) || defined(__amd64__) 719 PMCLOG_EMIT64(tsc_freq); 720 #else 721 /* other architectures will need to fill this in */ 722 PMCLOG_EMIT32(0); 723 PMCLOG_EMIT32(0); 724 #endif 725 memcpy(_le, &ts, sizeof(ts)); 726 _le += sizeof(ts)/4; 727 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN); 728 PMCLOG_DESPATCH_SYNC(po); 729 730 return (0); 731 732 error: 733 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not " 734 "stopped", __LINE__, po)); 735 736 if (po->po_file) 737 (void) fdrop(po->po_file, curthread); 738 po->po_file = NULL; /* clear file and error state */ 739 po->po_error = 0; 740 po->po_flags &= ~PMC_PO_OWNS_LOGFILE; 741 742 return (error); 743 } 744 745 746 /* 747 * De-configure a log file. This will throw away any buffers queued 748 * for this owner process. 749 */ 750 751 int 752 pmclog_deconfigure_log(struct pmc_owner *po) 753 { 754 int error; 755 struct pmclog_buffer *lb; 756 struct pmc_binding pb; 757 758 PMCDBG1(LOG,CFG,1, "de-config po=%p", po); 759 760 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) 761 return (EINVAL); 762 763 KASSERT(po->po_sscount == 0, 764 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po)); 765 KASSERT(po->po_file != NULL, 766 ("[pmclog,%d] po=%p no log file", __LINE__, po)); 767 768 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */ 769 pmclog_stop_kthread(po); 770 771 KASSERT(po->po_kthread == NULL, 772 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po)); 773 774 /* return all queued log buffers to the global pool */ 775 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) { 776 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next); 777 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 778 pmc_plb_rele(lb); 779 } 780 pmc_save_cpu_binding(&pb); 781 for (int i = 0; i < mp_ncpus; i++) { 782 pmc_select_cpu(i); 783 /* return the 'current' buffer to the global pool */ 784 if ((lb = po->po_curbuf[curcpu]) != NULL) { 785 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb); 786 pmc_plb_rele(lb); 787 } 788 } 789 pmc_restore_cpu_binding(&pb); 790 791 /* drop a reference to the fd */ 792 if (po->po_file != NULL) { 793 error = fdrop(po->po_file, curthread); 794 po->po_file = NULL; 795 } else 796 error = 0; 797 po->po_error = 0; 798 799 return (error); 800 } 801 802 /* 803 * Flush a process' log buffer. 804 */ 805 806 int 807 pmclog_flush(struct pmc_owner *po, int force) 808 { 809 int error; 810 811 PMCDBG1(LOG,FLS,1, "po=%p", po); 812 813 /* 814 * If there is a pending error recorded by the logger thread, 815 * return that. 816 */ 817 if (po->po_error) 818 return (po->po_error); 819 820 error = 0; 821 822 /* 823 * Check that we do have an active log file. 824 */ 825 mtx_lock(&pmc_kthread_mtx); 826 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) { 827 error = EINVAL; 828 goto error; 829 } 830 831 pmclog_schedule_all(po); 832 error: 833 mtx_unlock(&pmc_kthread_mtx); 834 835 return (error); 836 } 837 838 static void 839 pmclog_schedule_one_cond(struct pmc_owner *po) 840 { 841 struct pmclog_buffer *plb; 842 int cpu; 843 844 spinlock_enter(); 845 cpu = curcpu; 846 /* tell hardclock not to run again */ 847 if (PMC_CPU_HAS_SAMPLES(cpu)) 848 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); 849 850 plb = po->po_curbuf[cpu]; 851 if (plb && plb->plb_ptr != plb->plb_base) 852 pmclog_schedule_io(po, 1); 853 spinlock_exit(); 854 } 855 856 static void 857 pmclog_schedule_all(struct pmc_owner *po) 858 { 859 struct pmc_binding pb; 860 861 /* 862 * Schedule the current buffer if any and not empty. 863 */ 864 pmc_save_cpu_binding(&pb); 865 for (int i = 0; i < mp_ncpus; i++) { 866 pmc_select_cpu(i); 867 pmclog_schedule_one_cond(po); 868 } 869 pmc_restore_cpu_binding(&pb); 870 } 871 872 int 873 pmclog_close(struct pmc_owner *po) 874 { 875 876 PMCDBG1(LOG,CLO,1, "po=%p", po); 877 878 pmclog_process_closelog(po); 879 880 mtx_lock(&pmc_kthread_mtx); 881 /* 882 * Initiate shutdown: no new data queued, 883 * thread will close file on last block. 884 */ 885 po->po_flags |= PMC_PO_SHUTDOWN; 886 /* give time for all to see */ 887 DELAY(50); 888 889 /* 890 * Schedule the current buffer. 891 */ 892 pmclog_schedule_all(po); 893 wakeup_one(po); 894 895 mtx_unlock(&pmc_kthread_mtx); 896 897 return (0); 898 } 899 900 void 901 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps) 902 { 903 int n, recordlen; 904 uint32_t flags; 905 struct pmc_owner *po; 906 907 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid, 908 ps->ps_nsamples); 909 910 recordlen = offsetof(struct pmclog_callchain, pl_pc) + 911 ps->ps_nsamples * sizeof(uintfptr_t); 912 po = pm->pm_owner; 913 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags); 914 PMCLOG_RESERVE_SAFE(po, PMCLOG_TYPE_CALLCHAIN, recordlen, ps->ps_tsc); 915 PMCLOG_EMIT32(ps->ps_pid); 916 PMCLOG_EMIT32(ps->ps_tid); 917 PMCLOG_EMIT32(pm->pm_id); 918 PMCLOG_EMIT32(flags); 919 for (n = 0; n < ps->ps_nsamples; n++) 920 PMCLOG_EMITADDR(ps->ps_pc[n]); 921 PMCLOG_DESPATCH_SAFE(po); 922 } 923 924 void 925 pmclog_process_closelog(struct pmc_owner *po) 926 { 927 PMCLOG_RESERVE(po, PMCLOG_TYPE_CLOSELOG, 928 sizeof(struct pmclog_closelog)); 929 PMCLOG_DESPATCH_SYNC(po); 930 } 931 932 void 933 pmclog_process_dropnotify(struct pmc_owner *po) 934 { 935 PMCLOG_RESERVE(po, PMCLOG_TYPE_DROPNOTIFY, 936 sizeof(struct pmclog_dropnotify)); 937 PMCLOG_DESPATCH(po); 938 } 939 940 void 941 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start, 942 const char *path) 943 { 944 int pathlen, recordlen; 945 946 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__)); 947 948 pathlen = strlen(path) + 1; /* #bytes for path name */ 949 recordlen = offsetof(struct pmclog_map_in, pl_pathname) + 950 pathlen; 951 952 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_IN, recordlen); 953 PMCLOG_EMIT32(pid); 954 PMCLOG_EMIT32(0); 955 PMCLOG_EMITADDR(start); 956 PMCLOG_EMITSTRING(path,pathlen); 957 PMCLOG_DESPATCH_SYNC(po); 958 } 959 960 void 961 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start, 962 uintfptr_t end) 963 { 964 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__)); 965 966 PMCLOG_RESERVE(po, PMCLOG_TYPE_MAP_OUT, sizeof(struct pmclog_map_out)); 967 PMCLOG_EMIT32(pid); 968 PMCLOG_EMIT32(0); 969 PMCLOG_EMITADDR(start); 970 PMCLOG_EMITADDR(end); 971 PMCLOG_DESPATCH(po); 972 } 973 974 void 975 pmclog_process_pmcallocate(struct pmc *pm) 976 { 977 struct pmc_owner *po; 978 struct pmc_soft *ps; 979 980 po = pm->pm_owner; 981 982 PMCDBG1(LOG,ALL,1, "pm=%p", pm); 983 984 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) { 985 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATEDYN, 986 sizeof(struct pmclog_pmcallocatedyn)); 987 PMCLOG_EMIT32(pm->pm_id); 988 PMCLOG_EMIT32(pm->pm_event); 989 PMCLOG_EMIT32(pm->pm_flags); 990 PMCLOG_EMIT32(0); 991 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 992 ps = pmc_soft_ev_acquire(pm->pm_event); 993 if (ps != NULL) 994 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX); 995 else 996 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX); 997 pmc_soft_ev_release(ps); 998 PMCLOG_DESPATCH_SYNC(po); 999 } else { 1000 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCALLOCATE, 1001 sizeof(struct pmclog_pmcallocate)); 1002 PMCLOG_EMIT32(pm->pm_id); 1003 PMCLOG_EMIT32(pm->pm_event); 1004 PMCLOG_EMIT32(pm->pm_flags); 1005 PMCLOG_EMIT32(0); 1006 PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount); 1007 PMCLOG_DESPATCH_SYNC(po); 1008 } 1009 } 1010 1011 void 1012 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path) 1013 { 1014 int pathlen, recordlen; 1015 struct pmc_owner *po; 1016 1017 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid); 1018 1019 po = pm->pm_owner; 1020 1021 pathlen = strlen(path) + 1; /* #bytes for the string */ 1022 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen; 1023 1024 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCATTACH, recordlen); 1025 PMCLOG_EMIT32(pm->pm_id); 1026 PMCLOG_EMIT32(pid); 1027 PMCLOG_EMITSTRING(path, pathlen); 1028 PMCLOG_DESPATCH_SYNC(po); 1029 } 1030 1031 void 1032 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid) 1033 { 1034 struct pmc_owner *po; 1035 1036 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid); 1037 1038 po = pm->pm_owner; 1039 1040 PMCLOG_RESERVE(po, PMCLOG_TYPE_PMCDETACH, 1041 sizeof(struct pmclog_pmcdetach)); 1042 PMCLOG_EMIT32(pm->pm_id); 1043 PMCLOG_EMIT32(pid); 1044 PMCLOG_DESPATCH_SYNC(po); 1045 } 1046 1047 void 1048 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync) 1049 { 1050 if (sync) { 1051 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE, 1052 sizeof(struct pmclog_proccreate)); 1053 PMCLOG_EMIT32(p->p_pid); 1054 PMCLOG_EMIT32(p->p_flag); 1055 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1); 1056 PMCLOG_DESPATCH_SYNC(po); 1057 } else { 1058 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROC_CREATE, 1059 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, PMCLOG_TYPE_PROCCSW, 1085 sizeof(struct pmclog_proccsw), pmc_rdtsc()); 1086 PMCLOG_EMIT64(v); 1087 PMCLOG_EMIT32(pm->pm_id); 1088 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1089 PMCLOG_EMIT32(td->td_tid); 1090 PMCLOG_EMIT32(0); 1091 PMCLOG_DESPATCH_SCHED_LOCK(po); 1092 } 1093 1094 void 1095 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid, 1096 uintptr_t baseaddr, uintptr_t dynaddr, char *path) 1097 { 1098 int pathlen, recordlen; 1099 1100 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path); 1101 1102 pathlen = strlen(path) + 1; /* #bytes for the path */ 1103 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen; 1104 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXEC, recordlen); 1105 PMCLOG_EMIT32(pid); 1106 PMCLOG_EMIT32(pmid); 1107 PMCLOG_EMITADDR(baseaddr); 1108 PMCLOG_EMITADDR(dynaddr); 1109 PMCLOG_EMITSTRING(path,pathlen); 1110 PMCLOG_DESPATCH_SYNC(po); 1111 } 1112 1113 /* 1114 * Log a process exit event (and accumulated pmc value) to the log file. 1115 */ 1116 1117 void 1118 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp) 1119 { 1120 int ri; 1121 struct pmc_owner *po; 1122 1123 ri = PMC_TO_ROWINDEX(pm); 1124 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid, 1125 pp->pp_pmcs[ri].pp_pmcval); 1126 1127 po = pm->pm_owner; 1128 1129 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCEXIT, 1130 sizeof(struct pmclog_procexit)); 1131 PMCLOG_EMIT32(pm->pm_id); 1132 PMCLOG_EMIT32(pp->pp_proc->p_pid); 1133 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval); 1134 PMCLOG_DESPATCH(po); 1135 } 1136 1137 /* 1138 * Log a fork event. 1139 */ 1140 1141 void 1142 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid) 1143 { 1144 PMCLOG_RESERVE(po, PMCLOG_TYPE_PROCFORK, 1145 sizeof(struct pmclog_procfork)); 1146 PMCLOG_EMIT32(oldpid); 1147 PMCLOG_EMIT32(newpid); 1148 PMCLOG_DESPATCH(po); 1149 } 1150 1151 /* 1152 * Log a process exit event of the form suitable for system-wide PMCs. 1153 */ 1154 1155 void 1156 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid) 1157 { 1158 PMCLOG_RESERVE(po, PMCLOG_TYPE_SYSEXIT, sizeof(struct pmclog_sysexit)); 1159 PMCLOG_EMIT32(pid); 1160 PMCLOG_DESPATCH(po); 1161 } 1162 1163 void 1164 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync) 1165 { 1166 struct proc *p; 1167 1168 p = td->td_proc; 1169 if (sync) { 1170 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE, 1171 sizeof(struct pmclog_threadcreate)); 1172 PMCLOG_EMIT32(td->td_tid); 1173 PMCLOG_EMIT32(p->p_pid); 1174 PMCLOG_EMIT32(p->p_flag); 1175 PMCLOG_EMIT32(0); 1176 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1); 1177 PMCLOG_DESPATCH_SYNC(po); 1178 } else { 1179 PMCLOG_RESERVE(po, PMCLOG_TYPE_THR_CREATE, 1180 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, PMCLOG_TYPE_THR_EXIT, 1195 sizeof(struct pmclog_threadexit)); 1196 PMCLOG_EMIT32(td->td_tid); 1197 PMCLOG_DESPATCH(po); 1198 } 1199 1200 /* 1201 * Write a user log entry. 1202 */ 1203 1204 int 1205 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl) 1206 { 1207 int error; 1208 1209 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata); 1210 1211 error = 0; 1212 1213 PMCLOG_RESERVE_WITH_ERROR(po, PMCLOG_TYPE_USERDATA, 1214 sizeof(struct pmclog_userdata)); 1215 PMCLOG_EMIT32(wl->pm_userdata); 1216 PMCLOG_DESPATCH(po); 1217 1218 error: 1219 return (error); 1220 } 1221 1222 /* 1223 * Initialization. 1224 * 1225 * Create a pool of log buffers and initialize mutexes. 1226 */ 1227 1228 void 1229 pmclog_initialize(void) 1230 { 1231 struct pmclog_buffer *plb; 1232 int domain, ncpus, total; 1233 1234 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) { 1235 (void) printf("hwpmc: tunable logbuffersize=%d must be " 1236 "greater than zero and less than or equal to 16MB.\n", 1237 pmclog_buffer_size); 1238 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1239 } 1240 1241 if (pmc_nlogbuffers_pcpu <= 0) { 1242 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater " 1243 "than zero.\n", pmc_nlogbuffers_pcpu); 1244 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1245 } 1246 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) { 1247 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n", 1248 pmc_nlogbuffers_pcpu*pmclog_buffer_size); 1249 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU; 1250 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE; 1251 } 1252 for (domain = 0; domain < vm_ndomains; domain++) { 1253 ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus; 1254 total = ncpus * pmc_nlogbuffers_pcpu; 1255 1256 plb = malloc_domainset(sizeof(struct pmclog_buffer) * total, 1257 M_PMC, DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1258 pmc_dom_hdrs[domain]->pdbh_plbs = plb; 1259 for (; total > 0; total--, plb++) { 1260 void *buf; 1261 1262 buf = malloc_domainset(1024 * pmclog_buffer_size, M_PMC, 1263 DOMAINSET_PREF(domain), M_WAITOK | M_ZERO); 1264 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain); 1265 pmc_plb_rele_unlocked(plb); 1266 } 1267 } 1268 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF); 1269 } 1270 1271 /* 1272 * Shutdown logging. 1273 * 1274 * Destroy mutexes and release memory back the to free pool. 1275 */ 1276 1277 void 1278 pmclog_shutdown(void) 1279 { 1280 struct pmclog_buffer *plb; 1281 int domain; 1282 1283 mtx_destroy(&pmc_kthread_mtx); 1284 1285 for (domain = 0; domain < vm_ndomains; domain++) { 1286 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) { 1287 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next); 1288 free(plb->plb_base, M_PMC); 1289 } 1290 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC); 1291 } 1292 } 1293