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 #if (__FreeBSD_version >= 1100000)
41 #include <sys/capsicum.h>
43 #include <sys/capability.h>
46 #include <sys/kernel.h>
47 #include <sys/kthread.h>
49 #include <sys/module.h>
50 #include <sys/mutex.h>
52 #include <sys/pmckern.h>
53 #include <sys/pmclog.h>
55 #include <sys/signalvar.h>
56 #include <sys/sysctl.h>
57 #include <sys/systm.h>
59 #include <sys/unistd.h>
60 #include <sys/vnode.h>
66 SYSCTL_DECL(_kern_hwpmc);
69 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
72 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
73 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
74 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
77 * kern.hwpmc.nbuffer -- number of global log buffers
80 static int pmc_nlogbuffers = PMC_NLOGBUFFERS;
81 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers, CTLFLAG_RDTUN,
82 &pmc_nlogbuffers, 0, "number of global log buffers");
85 * Global log buffer list and associated spin lock.
88 TAILQ_HEAD(, pmclog_buffer) pmc_bufferlist =
89 TAILQ_HEAD_INITIALIZER(pmc_bufferlist);
90 static struct mtx pmc_bufferlist_mtx; /* spin lock */
91 static struct mtx pmc_kthread_mtx; /* sleep lock */
93 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D) do { \
94 const int __roundup = roundup(sizeof(*D), \
96 (D)->plb_fence = ((char *) (D)) + \
97 1024*pmclog_buffer_size; \
98 (D)->plb_base = (D)->plb_ptr = ((char *) (D)) + \
104 * Log file record constructors.
106 #define _PMCLOG_TO_HEADER(T,L) \
107 ((PMCLOG_HEADER_MAGIC << 24) | \
108 (PMCLOG_TYPE_ ## T << 16) | \
111 /* reserve LEN bytes of space and initialize the entry header */
112 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
114 int _len = roundup((LEN), sizeof(uint32_t)); \
115 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
118 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \
119 _le += 3 /* skip over timestamp */
121 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
122 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
123 error=ENOMEM;goto error)
125 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
126 #define PMCLOG_EMIT64(V) do { \
127 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
128 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
132 /* Emit a string. Caution: does NOT update _le, so needs to be last */
133 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
134 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0)
136 #define PMCLOG_DESPATCH(PO) \
137 pmclog_release((PO)); \
142 * Assertions about the log file format.
145 CTASSERT(sizeof(struct pmclog_callchain) == 6*4 +
146 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
147 CTASSERT(sizeof(struct pmclog_closelog) == 3*4);
148 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4);
149 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX +
150 4*4 + sizeof(uintfptr_t));
151 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
152 4*4 + sizeof(uintfptr_t));
153 CTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t));
154 CTASSERT(sizeof(struct pmclog_pcsample) == 6*4 + sizeof(uintfptr_t));
155 CTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4);
156 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX);
157 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4);
158 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4);
159 CTASSERT(sizeof(struct pmclog_proccsw) == 5*4 + 8);
160 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
162 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 +
164 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8);
165 CTASSERT(sizeof(struct pmclog_procfork) == 5*4);
166 CTASSERT(sizeof(struct pmclog_sysexit) == 4*4);
167 CTASSERT(sizeof(struct pmclog_userdata) == 4*4);
170 * Log buffer structure
173 struct pmclog_buffer {
174 TAILQ_ENTRY(pmclog_buffer) plb_next;
184 static int pmclog_get_buffer(struct pmc_owner *po);
185 static void pmclog_loop(void *arg);
186 static void pmclog_release(struct pmc_owner *po);
187 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
188 static void pmclog_schedule_io(struct pmc_owner *po);
189 static void pmclog_stop_kthread(struct pmc_owner *po);
200 pmclog_get_buffer(struct pmc_owner *po)
202 struct pmclog_buffer *plb;
204 mtx_assert(&po->po_mtx, MA_OWNED);
206 KASSERT(po->po_curbuf == NULL,
207 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
209 mtx_lock_spin(&pmc_bufferlist_mtx);
210 if ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL)
211 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);
212 mtx_unlock_spin(&pmc_bufferlist_mtx);
214 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
218 KASSERT(plb->plb_ptr == plb->plb_base &&
219 plb->plb_base < plb->plb_fence,
220 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
221 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
222 plb->plb_base, plb->plb_fence));
228 atomic_add_int(&pmc_stats.pm_buffer_requests, 1);
230 atomic_add_int(&pmc_stats.pm_buffer_requests_failed, 1);
232 return (plb ? 0 : ENOMEM);
238 * This function is executed by each pmc owner's helper thread.
242 pmclog_loop(void *arg)
245 struct pmc_owner *po;
246 struct pmclog_buffer *lb;
248 struct ucred *ownercred;
249 struct ucred *mycred;
255 po = (struct pmc_owner *) arg;
258 mycred = td->td_ucred;
261 ownercred = crhold(p->p_ucred);
264 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
265 KASSERT(po->po_kthread == curthread->td_proc,
266 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
267 po, po->po_kthread, curthread->td_proc));
273 * Loop waiting for I/O requests to be added to the owner
274 * struct's queue. The loop is exited when the log file
278 mtx_lock(&pmc_kthread_mtx);
282 /* check if we've been asked to exit */
283 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
286 if (lb == NULL) { /* look for a fresh buffer to write */
287 mtx_lock_spin(&po->po_mtx);
288 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
289 mtx_unlock_spin(&po->po_mtx);
291 /* No more buffers and shutdown required. */
292 if (po->po_flags & PMC_PO_SHUTDOWN) {
293 mtx_unlock(&pmc_kthread_mtx);
295 * Close the file to get PMCLOG_EOF
296 * error in pmclog(3).
298 fo_close(po->po_file, curthread);
299 mtx_lock(&pmc_kthread_mtx);
303 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
308 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
309 mtx_unlock_spin(&po->po_mtx);
312 mtx_unlock(&pmc_kthread_mtx);
314 /* process the request */
315 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
316 lb->plb_base, lb->plb_ptr);
317 /* change our thread's credentials before issuing the I/O */
319 aiov.iov_base = lb->plb_base;
320 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
322 auio.uio_iov = &aiov;
324 auio.uio_offset = -1;
325 auio.uio_resid = nbytes;
326 auio.uio_rw = UIO_WRITE;
327 auio.uio_segflg = UIO_SYSSPACE;
330 /* switch thread credentials -- see kern_ktrace.c */
331 td->td_ucred = ownercred;
332 error = fo_write(po->po_file, &auio, ownercred, 0, td);
333 td->td_ucred = mycred;
336 /* XXX some errors are recoverable */
337 /* send a SIGIO to the owner and exit */
339 kern_psignal(p, SIGIO);
342 mtx_lock(&pmc_kthread_mtx);
344 po->po_error = error; /* save for flush log */
346 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
351 mtx_lock(&pmc_kthread_mtx);
353 /* put the used buffer back into the global pool */
354 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
356 mtx_lock_spin(&pmc_bufferlist_mtx);
357 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
358 mtx_unlock_spin(&pmc_bufferlist_mtx);
363 wakeup_one(po->po_kthread);
364 po->po_kthread = NULL;
366 mtx_unlock(&pmc_kthread_mtx);
368 /* return the current I/O buffer to the global pool */
370 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
372 mtx_lock_spin(&pmc_bufferlist_mtx);
373 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
374 mtx_unlock_spin(&pmc_bufferlist_mtx);
378 * Exit this thread, signalling the waiter
387 * Release and log entry and schedule an I/O if needed.
391 pmclog_release(struct pmc_owner *po)
393 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
394 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
395 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
396 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
397 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
398 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
400 /* schedule an I/O if we've filled a buffer */
401 if (po->po_curbuf->plb_ptr >= po->po_curbuf->plb_fence)
402 pmclog_schedule_io(po);
404 mtx_unlock_spin(&po->po_mtx);
406 PMCDBG1(LOG,REL,1, "po=%p", po);
411 * Attempt to reserve 'length' bytes of space in an owner's log
412 * buffer. The function returns a pointer to 'length' bytes of space
413 * if there was enough space or returns NULL if no space was
414 * available. Non-null returns do so with the po mutex locked. The
415 * caller must invoke pmclog_release() on the pmc owner structure
420 pmclog_reserve(struct pmc_owner *po, int length)
422 uintptr_t newptr, oldptr;
426 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
428 KASSERT(length % sizeof(uint32_t) == 0,
429 ("[pmclog,%d] length not a multiple of word size", __LINE__));
431 mtx_lock_spin(&po->po_mtx);
433 /* No more data when shutdown in progress. */
434 if (po->po_flags & PMC_PO_SHUTDOWN) {
435 mtx_unlock_spin(&po->po_mtx);
439 if (po->po_curbuf == NULL)
440 if (pmclog_get_buffer(po) != 0) {
441 mtx_unlock_spin(&po->po_mtx);
445 KASSERT(po->po_curbuf != NULL,
446 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
448 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base &&
449 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
450 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
451 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
452 po->po_curbuf->plb_fence));
454 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
455 newptr = oldptr + length;
457 KASSERT(oldptr != (uintptr_t) NULL,
458 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
461 * If we have space in the current buffer, return a pointer to
462 * available space with the PO structure locked.
464 if (newptr <= (uintptr_t) po->po_curbuf->plb_fence) {
465 po->po_curbuf->plb_ptr = (char *) newptr;
470 * Otherwise, schedule the current buffer for output and get a
473 pmclog_schedule_io(po);
475 if (pmclog_get_buffer(po) != 0) {
476 mtx_unlock_spin(&po->po_mtx);
480 KASSERT(po->po_curbuf != NULL,
481 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
483 KASSERT(po->po_curbuf->plb_ptr != NULL,
484 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
486 KASSERT(po->po_curbuf->plb_ptr == po->po_curbuf->plb_base &&
487 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
488 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
489 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
490 po->po_curbuf->plb_fence));
492 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
495 lh = (uint32_t *) oldptr;
496 lh++; /* skip header */
497 getnanotime(&ts); /* fill in the timestamp */
498 *lh++ = ts.tv_sec & 0xFFFFFFFF;
499 *lh++ = ts.tv_nsec & 0xFFFFFFF;
500 return ((uint32_t *) oldptr);
506 * Transfer the current buffer to the helper kthread.
510 pmclog_schedule_io(struct pmc_owner *po)
512 KASSERT(po->po_curbuf != NULL,
513 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
515 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
516 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
517 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
518 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
519 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
520 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
522 PMCDBG1(LOG,SIO, 1, "po=%p", po);
524 mtx_assert(&po->po_mtx, MA_OWNED);
527 * Add the current buffer to the tail of the buffer list and
530 TAILQ_INSERT_TAIL(&po->po_logbuffers, po->po_curbuf, plb_next);
531 po->po_curbuf = NULL;
536 * Stop the helper kthread.
540 pmclog_stop_kthread(struct pmc_owner *po)
543 * Close the file to force the thread out of fo_write,
544 * unset flag, wakeup the helper thread,
545 * wait for it to exit
548 if (po->po_file != NULL)
549 fo_close(po->po_file, curthread);
551 mtx_lock(&pmc_kthread_mtx);
552 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
555 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
556 mtx_unlock(&pmc_kthread_mtx);
564 * Configure a log file for pmc owner 'po'.
566 * Parameter 'logfd' is a file handle referencing an open file in the
567 * owner process. This file needs to have been opened for writing.
571 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
577 * As long as it is possible to get a LOR between pmc_sx lock and
578 * proctree/allproc sx locks used for adding a new process, assure
579 * the former is not held here.
581 sx_assert(&pmc_sx, SA_UNLOCKED);
582 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
586 /* return EBUSY if a log file was already present */
587 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
590 KASSERT(po->po_kthread == NULL,
591 ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po,
593 KASSERT(po->po_file == NULL,
594 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
597 /* get a reference to the file state */
598 error = fget_write(curthread, logfd,
599 cap_rights_init(&rights, CAP_WRITE), &po->po_file);
603 /* mark process as owning a log file */
604 po->po_flags |= PMC_PO_OWNS_LOGFILE;
605 error = kproc_create(pmclog_loop, po, &po->po_kthread,
606 RFHIGHPID, 0, "hwpmc: proc(%d)", p->p_pid);
610 /* mark process as using HWPMCs */
612 p->p_flag |= P_HWPMC;
615 /* create a log initialization entry */
616 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
617 sizeof(struct pmclog_initialize));
618 PMCLOG_EMIT32(PMC_VERSION);
619 PMCLOG_EMIT32(md->pmd_cputype);
625 /* shutdown the thread */
627 pmclog_stop_kthread(po);
629 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
630 "stopped", __LINE__, po));
633 (void) fdrop(po->po_file, curthread);
634 po->po_file = NULL; /* clear file and error state */
642 * De-configure a log file. This will throw away any buffers queued
643 * for this owner process.
647 pmclog_deconfigure_log(struct pmc_owner *po)
650 struct pmclog_buffer *lb;
652 PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
654 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
657 KASSERT(po->po_sscount == 0,
658 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
659 KASSERT(po->po_file != NULL,
660 ("[pmclog,%d] po=%p no log file", __LINE__, po));
662 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
663 pmclog_stop_kthread(po);
665 KASSERT(po->po_kthread == NULL,
666 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
668 /* return all queued log buffers to the global pool */
669 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
670 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
671 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
672 mtx_lock_spin(&pmc_bufferlist_mtx);
673 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
674 mtx_unlock_spin(&pmc_bufferlist_mtx);
677 /* return the 'current' buffer to the global pool */
678 if ((lb = po->po_curbuf) != NULL) {
679 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
680 mtx_lock_spin(&pmc_bufferlist_mtx);
681 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
682 mtx_unlock_spin(&pmc_bufferlist_mtx);
685 /* drop a reference to the fd */
686 error = fdrop(po->po_file, curthread);
694 * Flush a process' log buffer.
698 pmclog_flush(struct pmc_owner *po)
701 struct pmclog_buffer *lb;
703 PMCDBG1(LOG,FLS,1, "po=%p", po);
706 * If there is a pending error recorded by the logger thread,
710 return (po->po_error);
715 * Check that we do have an active log file.
717 mtx_lock(&pmc_kthread_mtx);
718 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
724 * Schedule the current buffer if any and not empty.
726 mtx_lock_spin(&po->po_mtx);
728 if (lb && lb->plb_ptr != lb->plb_base) {
729 pmclog_schedule_io(po);
732 mtx_unlock_spin(&po->po_mtx);
735 mtx_unlock(&pmc_kthread_mtx);
741 pmclog_close(struct pmc_owner *po)
744 PMCDBG1(LOG,CLO,1, "po=%p", po);
746 mtx_lock(&pmc_kthread_mtx);
749 * Schedule the current buffer.
751 mtx_lock_spin(&po->po_mtx);
753 pmclog_schedule_io(po);
756 mtx_unlock_spin(&po->po_mtx);
759 * Initiate shutdown: no new data queued,
760 * thread will close file on last block.
762 po->po_flags |= PMC_PO_SHUTDOWN;
764 mtx_unlock(&pmc_kthread_mtx);
770 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
774 struct pmc_owner *po;
776 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
779 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
780 ps->ps_nsamples * sizeof(uintfptr_t);
782 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
783 PMCLOG_RESERVE(po, CALLCHAIN, recordlen);
784 PMCLOG_EMIT32(ps->ps_pid);
785 PMCLOG_EMIT32(pm->pm_id);
786 PMCLOG_EMIT32(flags);
787 for (n = 0; n < ps->ps_nsamples; n++)
788 PMCLOG_EMITADDR(ps->ps_pc[n]);
793 pmclog_process_closelog(struct pmc_owner *po)
795 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
800 pmclog_process_dropnotify(struct pmc_owner *po)
802 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
807 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
810 int pathlen, recordlen;
812 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
814 pathlen = strlen(path) + 1; /* #bytes for path name */
815 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
818 PMCLOG_RESERVE(po, MAP_IN, recordlen);
820 PMCLOG_EMITADDR(start);
821 PMCLOG_EMITSTRING(path,pathlen);
826 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
829 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
831 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
833 PMCLOG_EMITADDR(start);
834 PMCLOG_EMITADDR(end);
839 pmclog_process_pmcallocate(struct pmc *pm)
841 struct pmc_owner *po;
846 PMCDBG1(LOG,ALL,1, "pm=%p", pm);
848 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
849 PMCLOG_RESERVE(po, PMCALLOCATEDYN,
850 sizeof(struct pmclog_pmcallocatedyn));
851 PMCLOG_EMIT32(pm->pm_id);
852 PMCLOG_EMIT32(pm->pm_event);
853 PMCLOG_EMIT32(pm->pm_flags);
854 ps = pmc_soft_ev_acquire(pm->pm_event);
856 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
858 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
859 pmc_soft_ev_release(ps);
862 PMCLOG_RESERVE(po, PMCALLOCATE,
863 sizeof(struct pmclog_pmcallocate));
864 PMCLOG_EMIT32(pm->pm_id);
865 PMCLOG_EMIT32(pm->pm_event);
866 PMCLOG_EMIT32(pm->pm_flags);
872 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
874 int pathlen, recordlen;
875 struct pmc_owner *po;
877 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
881 pathlen = strlen(path) + 1; /* #bytes for the string */
882 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
884 PMCLOG_RESERVE(po, PMCATTACH, recordlen);
885 PMCLOG_EMIT32(pm->pm_id);
887 PMCLOG_EMITSTRING(path, pathlen);
892 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
894 struct pmc_owner *po;
896 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
900 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
901 PMCLOG_EMIT32(pm->pm_id);
907 * Log a context switch event to the log file.
911 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v)
913 struct pmc_owner *po;
915 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
916 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
918 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
923 PMCLOG_RESERVE(po, PROCCSW, sizeof(struct pmclog_proccsw));
924 PMCLOG_EMIT32(pm->pm_id);
926 PMCLOG_EMIT32(pp->pp_proc->p_pid);
931 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
932 uintfptr_t startaddr, char *path)
934 int pathlen, recordlen;
936 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
938 pathlen = strlen(path) + 1; /* #bytes for the path */
939 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
941 PMCLOG_RESERVE(po, PROCEXEC, recordlen);
943 PMCLOG_EMITADDR(startaddr);
945 PMCLOG_EMITSTRING(path,pathlen);
950 * Log a process exit event (and accumulated pmc value) to the log file.
954 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
957 struct pmc_owner *po;
959 ri = PMC_TO_ROWINDEX(pm);
960 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
961 pp->pp_pmcs[ri].pp_pmcval);
965 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
966 PMCLOG_EMIT32(pm->pm_id);
967 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
968 PMCLOG_EMIT32(pp->pp_proc->p_pid);
977 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
979 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
980 PMCLOG_EMIT32(oldpid);
981 PMCLOG_EMIT32(newpid);
986 * Log a process exit event of the form suitable for system-wide PMCs.
990 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
992 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
998 * Write a user log entry.
1002 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
1006 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
1010 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
1011 sizeof(struct pmclog_userdata));
1012 PMCLOG_EMIT32(wl->pm_userdata);
1013 PMCLOG_DESPATCH(po);
1022 * Create a pool of log buffers and initialize mutexes.
1029 struct pmclog_buffer *plb;
1031 if (pmclog_buffer_size <= 0) {
1032 (void) printf("hwpmc: tunable logbuffersize=%d must be "
1033 "greater than zero.\n", pmclog_buffer_size);
1034 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1037 if (pmc_nlogbuffers <= 0) {
1038 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
1039 "than zero.\n", pmc_nlogbuffers);
1040 pmc_nlogbuffers = PMC_NLOGBUFFERS;
1043 /* create global pool of log buffers */
1044 for (n = 0; n < pmc_nlogbuffers; n++) {
1045 plb = malloc(1024 * pmclog_buffer_size, M_PMC,
1047 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb);
1048 TAILQ_INSERT_HEAD(&pmc_bufferlist, plb, plb_next);
1050 mtx_init(&pmc_bufferlist_mtx, "pmc-buffer-list", "pmc-leaf",
1052 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1058 * Destroy mutexes and release memory back the to free pool.
1064 struct pmclog_buffer *plb;
1066 mtx_destroy(&pmc_kthread_mtx);
1067 mtx_destroy(&pmc_bufferlist_mtx);
1069 while ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL) {
1070 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);