2 * Copyright (c) 2005-2007 Joseph Koshy
3 * Copyright (c) 2007 The FreeBSD Foundation
6 * Portions of this software were developed by A. Joseph Koshy under
7 * sponsorship from the FreeBSD Foundation and Google, Inc.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * Logging code for hwpmc(4)
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
39 #include <sys/param.h>
40 #include <sys/capability.h>
42 #include <sys/kernel.h>
43 #include <sys/kthread.h>
45 #include <sys/module.h>
46 #include <sys/mutex.h>
48 #include <sys/pmckern.h>
49 #include <sys/pmclog.h>
51 #include <sys/signalvar.h>
52 #include <sys/sysctl.h>
53 #include <sys/systm.h>
55 #include <sys/unistd.h>
56 #include <sys/vnode.h>
62 SYSCTL_DECL(_kern_hwpmc);
65 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
68 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
69 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size);
70 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_TUN|CTLFLAG_RD,
71 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
74 * kern.hwpmc.nbuffer -- number of global log buffers
77 static int pmc_nlogbuffers = PMC_NLOGBUFFERS;
78 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers);
79 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers, CTLFLAG_TUN|CTLFLAG_RD,
80 &pmc_nlogbuffers, 0, "number of global log buffers");
83 * Global log buffer list and associated spin lock.
86 TAILQ_HEAD(, pmclog_buffer) pmc_bufferlist =
87 TAILQ_HEAD_INITIALIZER(pmc_bufferlist);
88 static struct mtx pmc_bufferlist_mtx; /* spin lock */
89 static struct mtx pmc_kthread_mtx; /* sleep lock */
91 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D) do { \
92 const int __roundup = roundup(sizeof(*D), \
94 (D)->plb_fence = ((char *) (D)) + \
95 1024*pmclog_buffer_size; \
96 (D)->plb_base = (D)->plb_ptr = ((char *) (D)) + \
102 * Log file record constructors.
104 #define _PMCLOG_TO_HEADER(T,L) \
105 ((PMCLOG_HEADER_MAGIC << 24) | \
106 (PMCLOG_TYPE_ ## T << 16) | \
109 /* reserve LEN bytes of space and initialize the entry header */
110 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
112 int _len = roundup((LEN), sizeof(uint32_t)); \
113 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
116 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \
117 _le += 3 /* skip over timestamp */
119 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
120 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
121 error=ENOMEM;goto error)
123 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
124 #define PMCLOG_EMIT64(V) do { \
125 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
126 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
130 /* Emit a string. Caution: does NOT update _le, so needs to be last */
131 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
133 #define PMCLOG_DESPATCH(PO) \
134 pmclog_release((PO)); \
139 * Assertions about the log file format.
142 CTASSERT(sizeof(struct pmclog_callchain) == 6*4 +
143 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
144 CTASSERT(sizeof(struct pmclog_closelog) == 3*4);
145 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4);
146 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX +
147 4*4 + sizeof(uintfptr_t));
148 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
149 4*4 + sizeof(uintfptr_t));
150 CTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t));
151 CTASSERT(sizeof(struct pmclog_pcsample) == 6*4 + sizeof(uintfptr_t));
152 CTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4);
153 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX);
154 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4);
155 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4);
156 CTASSERT(sizeof(struct pmclog_proccsw) == 5*4 + 8);
157 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
159 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 +
161 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8);
162 CTASSERT(sizeof(struct pmclog_procfork) == 5*4);
163 CTASSERT(sizeof(struct pmclog_sysexit) == 4*4);
164 CTASSERT(sizeof(struct pmclog_userdata) == 4*4);
167 * Log buffer structure
170 struct pmclog_buffer {
171 TAILQ_ENTRY(pmclog_buffer) plb_next;
181 static int pmclog_get_buffer(struct pmc_owner *po);
182 static void pmclog_loop(void *arg);
183 static void pmclog_release(struct pmc_owner *po);
184 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
185 static void pmclog_schedule_io(struct pmc_owner *po);
186 static void pmclog_stop_kthread(struct pmc_owner *po);
197 pmclog_get_buffer(struct pmc_owner *po)
199 struct pmclog_buffer *plb;
201 mtx_assert(&po->po_mtx, MA_OWNED);
203 KASSERT(po->po_curbuf == NULL,
204 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
206 mtx_lock_spin(&pmc_bufferlist_mtx);
207 if ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL)
208 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);
209 mtx_unlock_spin(&pmc_bufferlist_mtx);
211 PMCDBG(LOG,GTB,1, "po=%p plb=%p", po, plb);
215 KASSERT(plb->plb_ptr == plb->plb_base &&
216 plb->plb_base < plb->plb_fence,
217 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
218 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
219 plb->plb_base, plb->plb_fence));
225 atomic_add_int(&pmc_stats.pm_buffer_requests, 1);
227 atomic_add_int(&pmc_stats.pm_buffer_requests_failed, 1);
229 return (plb ? 0 : ENOMEM);
235 * This function is executed by each pmc owner's helper thread.
239 pmclog_loop(void *arg)
241 int error, last_buffer;
242 struct pmc_owner *po;
243 struct pmclog_buffer *lb;
245 struct ucred *ownercred;
246 struct ucred *mycred;
252 po = (struct pmc_owner *) arg;
255 mycred = td->td_ucred;
259 ownercred = crhold(p->p_ucred);
262 PMCDBG(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
263 KASSERT(po->po_kthread == curthread->td_proc,
264 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
265 po, po->po_kthread, curthread->td_proc));
271 * Loop waiting for I/O requests to be added to the owner
272 * struct's queue. The loop is exited when the log file
276 mtx_lock(&pmc_kthread_mtx);
280 /* check if we've been asked to exit */
281 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
284 if (lb == NULL) { /* look for a fresh buffer to write */
285 mtx_lock_spin(&po->po_mtx);
286 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
287 mtx_unlock_spin(&po->po_mtx);
289 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
294 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
295 if (po->po_flags & PMC_PO_SHUTDOWN)
296 last_buffer = TAILQ_EMPTY(&po->po_logbuffers);
297 mtx_unlock_spin(&po->po_mtx);
300 mtx_unlock(&pmc_kthread_mtx);
302 /* process the request */
303 PMCDBG(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
304 lb->plb_base, lb->plb_ptr);
305 /* change our thread's credentials before issuing the I/O */
307 aiov.iov_base = lb->plb_base;
308 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
310 auio.uio_iov = &aiov;
312 auio.uio_offset = -1;
313 auio.uio_resid = nbytes;
314 auio.uio_rw = UIO_WRITE;
315 auio.uio_segflg = UIO_SYSSPACE;
318 /* switch thread credentials -- see kern_ktrace.c */
319 td->td_ucred = ownercred;
320 error = fo_write(po->po_file, &auio, ownercred, 0, td);
321 td->td_ucred = mycred;
324 /* XXX some errors are recoverable */
325 /* send a SIGIO to the owner and exit */
327 kern_psignal(p, SIGIO);
330 mtx_lock(&pmc_kthread_mtx);
332 po->po_error = error; /* save for flush log */
334 PMCDBG(LOG,WRI,2, "po=%p error=%d", po, error);
341 * Close the file to get PMCLOG_EOF error
344 fo_close(po->po_file, curthread);
347 mtx_lock(&pmc_kthread_mtx);
349 /* put the used buffer back into the global pool */
350 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
352 mtx_lock_spin(&pmc_bufferlist_mtx);
353 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
354 mtx_unlock_spin(&pmc_bufferlist_mtx);
359 po->po_kthread = NULL;
361 mtx_unlock(&pmc_kthread_mtx);
363 /* return the current I/O buffer to the global pool */
365 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
367 mtx_lock_spin(&pmc_bufferlist_mtx);
368 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
369 mtx_unlock_spin(&pmc_bufferlist_mtx);
373 * Exit this thread, signalling the waiter
382 * Release and log entry and schedule an I/O if needed.
386 pmclog_release(struct pmc_owner *po)
388 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
389 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
390 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
391 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
392 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
393 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
395 /* schedule an I/O if we've filled a buffer */
396 if (po->po_curbuf->plb_ptr >= po->po_curbuf->plb_fence)
397 pmclog_schedule_io(po);
399 mtx_unlock_spin(&po->po_mtx);
401 PMCDBG(LOG,REL,1, "po=%p", po);
406 * Attempt to reserve 'length' bytes of space in an owner's log
407 * buffer. The function returns a pointer to 'length' bytes of space
408 * if there was enough space or returns NULL if no space was
409 * available. Non-null returns do so with the po mutex locked. The
410 * caller must invoke pmclog_release() on the pmc owner structure
415 pmclog_reserve(struct pmc_owner *po, int length)
417 uintptr_t newptr, oldptr;
421 PMCDBG(LOG,ALL,1, "po=%p len=%d", po, length);
423 KASSERT(length % sizeof(uint32_t) == 0,
424 ("[pmclog,%d] length not a multiple of word size", __LINE__));
426 mtx_lock_spin(&po->po_mtx);
428 /* No more data when shutdown in progress. */
429 if (po->po_flags & PMC_PO_SHUTDOWN) {
430 mtx_unlock_spin(&po->po_mtx);
434 if (po->po_curbuf == NULL)
435 if (pmclog_get_buffer(po) != 0) {
436 mtx_unlock_spin(&po->po_mtx);
440 KASSERT(po->po_curbuf != NULL,
441 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
443 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base &&
444 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
445 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
446 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
447 po->po_curbuf->plb_fence));
449 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
450 newptr = oldptr + length;
452 KASSERT(oldptr != (uintptr_t) NULL,
453 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
456 * If we have space in the current buffer, return a pointer to
457 * available space with the PO structure locked.
459 if (newptr <= (uintptr_t) po->po_curbuf->plb_fence) {
460 po->po_curbuf->plb_ptr = (char *) newptr;
465 * Otherwise, schedule the current buffer for output and get a
468 pmclog_schedule_io(po);
470 if (pmclog_get_buffer(po) != 0) {
471 mtx_unlock_spin(&po->po_mtx);
475 KASSERT(po->po_curbuf != NULL,
476 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
478 KASSERT(po->po_curbuf->plb_ptr != NULL,
479 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
481 KASSERT(po->po_curbuf->plb_ptr == po->po_curbuf->plb_base &&
482 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
483 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
484 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
485 po->po_curbuf->plb_fence));
487 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
490 lh = (uint32_t *) oldptr;
491 lh++; /* skip header */
492 getnanotime(&ts); /* fill in the timestamp */
493 *lh++ = ts.tv_sec & 0xFFFFFFFF;
494 *lh++ = ts.tv_nsec & 0xFFFFFFF;
495 return ((uint32_t *) oldptr);
501 * Transfer the current buffer to the helper kthread.
505 pmclog_schedule_io(struct pmc_owner *po)
507 KASSERT(po->po_curbuf != NULL,
508 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
510 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
511 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
512 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
513 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
514 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
515 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
517 PMCDBG(LOG,SIO, 1, "po=%p", po);
519 mtx_assert(&po->po_mtx, MA_OWNED);
522 * Add the current buffer to the tail of the buffer list and
525 TAILQ_INSERT_TAIL(&po->po_logbuffers, po->po_curbuf, plb_next);
526 po->po_curbuf = NULL;
531 * Stop the helper kthread.
535 pmclog_stop_kthread(struct pmc_owner *po)
538 * Close the file to force the thread out of fo_write,
539 * unset flag, wakeup the helper thread,
540 * wait for it to exit
543 if (po->po_file != NULL)
544 fo_close(po->po_file, curthread);
546 mtx_lock(&pmc_kthread_mtx);
547 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
550 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
551 mtx_unlock(&pmc_kthread_mtx);
559 * Configure a log file for pmc owner 'po'.
561 * Parameter 'logfd' is a file handle referencing an open file in the
562 * owner process. This file needs to have been opened for writing.
566 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
572 * As long as it is possible to get a LOR between pmc_sx lock and
573 * proctree/allproc sx locks used for adding a new process, assure
574 * the former is not held here.
576 sx_assert(&pmc_sx, SA_UNLOCKED);
577 PMCDBG(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
581 /* return EBUSY if a log file was already present */
582 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
585 KASSERT(po->po_kthread == NULL,
586 ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po,
588 KASSERT(po->po_file == NULL,
589 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
592 /* get a reference to the file state */
593 error = fget_write(curthread, logfd, CAP_WRITE, &po->po_file);
597 /* mark process as owning a log file */
598 po->po_flags |= PMC_PO_OWNS_LOGFILE;
599 error = kproc_create(pmclog_loop, po, &po->po_kthread,
600 RFHIGHPID, 0, "hwpmc: proc(%d)", p->p_pid);
604 /* mark process as using HWPMCs */
606 p->p_flag |= P_HWPMC;
609 /* create a log initialization entry */
610 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
611 sizeof(struct pmclog_initialize));
612 PMCLOG_EMIT32(PMC_VERSION);
613 PMCLOG_EMIT32(md->pmd_cputype);
619 /* shutdown the thread */
621 pmclog_stop_kthread(po);
623 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
624 "stopped", __LINE__, po));
627 (void) fdrop(po->po_file, curthread);
628 po->po_file = NULL; /* clear file and error state */
636 * De-configure a log file. This will throw away any buffers queued
637 * for this owner process.
641 pmclog_deconfigure_log(struct pmc_owner *po)
644 struct pmclog_buffer *lb;
646 PMCDBG(LOG,CFG,1, "de-config po=%p", po);
648 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
651 KASSERT(po->po_sscount == 0,
652 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
653 KASSERT(po->po_file != NULL,
654 ("[pmclog,%d] po=%p no log file", __LINE__, po));
656 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
658 pmclog_stop_kthread(po);
660 KASSERT(po->po_kthread == NULL,
661 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
663 /* return all queued log buffers to the global pool */
664 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
665 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
666 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
667 mtx_lock_spin(&pmc_bufferlist_mtx);
668 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
669 mtx_unlock_spin(&pmc_bufferlist_mtx);
672 /* return the 'current' buffer to the global pool */
673 if ((lb = po->po_curbuf) != NULL) {
674 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
675 mtx_lock_spin(&pmc_bufferlist_mtx);
676 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
677 mtx_unlock_spin(&pmc_bufferlist_mtx);
680 /* drop a reference to the fd */
681 error = fdrop(po->po_file, curthread);
689 * Flush a process' log buffer.
693 pmclog_flush(struct pmc_owner *po)
697 PMCDBG(LOG,FLS,1, "po=%p", po);
700 * If there is a pending error recorded by the logger thread,
704 return (po->po_error);
709 * Check that we do have an active log file.
711 mtx_lock(&pmc_kthread_mtx);
712 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
718 * Schedule the current buffer if any.
720 mtx_lock_spin(&po->po_mtx);
722 pmclog_schedule_io(po);
723 mtx_unlock_spin(&po->po_mtx);
726 * Initiate shutdown: no new data queued,
727 * thread will close file on last block.
729 po->po_flags |= PMC_PO_SHUTDOWN;
732 mtx_unlock(&pmc_kthread_mtx);
739 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
743 struct pmc_owner *po;
745 PMCDBG(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
748 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
749 ps->ps_nsamples * sizeof(uintfptr_t);
751 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
752 PMCLOG_RESERVE(po, CALLCHAIN, recordlen);
753 PMCLOG_EMIT32(ps->ps_pid);
754 PMCLOG_EMIT32(pm->pm_id);
755 PMCLOG_EMIT32(flags);
756 for (n = 0; n < ps->ps_nsamples; n++)
757 PMCLOG_EMITADDR(ps->ps_pc[n]);
762 pmclog_process_closelog(struct pmc_owner *po)
764 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
769 pmclog_process_dropnotify(struct pmc_owner *po)
771 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
776 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
779 int pathlen, recordlen;
781 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
783 pathlen = strlen(path) + 1; /* #bytes for path name */
784 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
787 PMCLOG_RESERVE(po, MAP_IN, recordlen);
789 PMCLOG_EMITADDR(start);
790 PMCLOG_EMITSTRING(path,pathlen);
795 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
798 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
800 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
802 PMCLOG_EMITADDR(start);
803 PMCLOG_EMITADDR(end);
808 pmclog_process_pmcallocate(struct pmc *pm)
810 struct pmc_owner *po;
814 PMCDBG(LOG,ALL,1, "pm=%p", pm);
816 PMCLOG_RESERVE(po, PMCALLOCATE, sizeof(struct pmclog_pmcallocate));
817 PMCLOG_EMIT32(pm->pm_id);
818 PMCLOG_EMIT32(pm->pm_event);
819 PMCLOG_EMIT32(pm->pm_flags);
824 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
826 int pathlen, recordlen;
827 struct pmc_owner *po;
829 PMCDBG(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
833 pathlen = strlen(path) + 1; /* #bytes for the string */
834 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
836 PMCLOG_RESERVE(po, PMCATTACH, recordlen);
837 PMCLOG_EMIT32(pm->pm_id);
839 PMCLOG_EMITSTRING(path, pathlen);
844 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
846 struct pmc_owner *po;
848 PMCDBG(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
852 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
853 PMCLOG_EMIT32(pm->pm_id);
859 * Log a context switch event to the log file.
863 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v)
865 struct pmc_owner *po;
867 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
868 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
870 PMCDBG(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
875 PMCLOG_RESERVE(po, PROCCSW, sizeof(struct pmclog_proccsw));
876 PMCLOG_EMIT32(pm->pm_id);
878 PMCLOG_EMIT32(pp->pp_proc->p_pid);
883 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
884 uintfptr_t startaddr, char *path)
886 int pathlen, recordlen;
888 PMCDBG(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
890 pathlen = strlen(path) + 1; /* #bytes for the path */
891 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
893 PMCLOG_RESERVE(po, PROCEXEC, recordlen);
895 PMCLOG_EMITADDR(startaddr);
897 PMCLOG_EMITSTRING(path,pathlen);
902 * Log a process exit event (and accumulated pmc value) to the log file.
906 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
909 struct pmc_owner *po;
911 ri = PMC_TO_ROWINDEX(pm);
912 PMCDBG(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
913 pp->pp_pmcs[ri].pp_pmcval);
917 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
918 PMCLOG_EMIT32(pm->pm_id);
919 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
920 PMCLOG_EMIT32(pp->pp_proc->p_pid);
929 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
931 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
932 PMCLOG_EMIT32(oldpid);
933 PMCLOG_EMIT32(newpid);
938 * Log a process exit event of the form suitable for system-wide PMCs.
942 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
944 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
950 * Write a user log entry.
954 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
958 PMCDBG(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
962 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
963 sizeof(struct pmclog_userdata));
964 PMCLOG_EMIT32(wl->pm_userdata);
974 * Create a pool of log buffers and initialize mutexes.
981 struct pmclog_buffer *plb;
983 if (pmclog_buffer_size <= 0) {
984 (void) printf("hwpmc: tunable logbuffersize=%d must be "
985 "greater than zero.\n", pmclog_buffer_size);
986 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
989 if (pmc_nlogbuffers <= 0) {
990 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
991 "than zero.\n", pmc_nlogbuffers);
992 pmc_nlogbuffers = PMC_NLOGBUFFERS;
995 /* create global pool of log buffers */
996 for (n = 0; n < pmc_nlogbuffers; n++) {
997 plb = malloc(1024 * pmclog_buffer_size, M_PMC,
999 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb);
1000 TAILQ_INSERT_HEAD(&pmc_bufferlist, plb, plb_next);
1002 mtx_init(&pmc_bufferlist_mtx, "pmc-buffer-list", "pmc-leaf",
1004 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1010 * Destroy mutexes and release memory back the to free pool.
1016 struct pmclog_buffer *plb;
1018 mtx_destroy(&pmc_kthread_mtx);
1019 mtx_destroy(&pmc_bufferlist_mtx);
1021 while ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL) {
1022 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);