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 #if (__FreeBSD_version < 1100000)
74 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size);
76 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
77 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
80 * kern.hwpmc.nbuffer -- number of global log buffers
83 static int pmc_nlogbuffers = PMC_NLOGBUFFERS;
84 #if (__FreeBSD_version < 1100000)
85 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers);
87 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers, CTLFLAG_RDTUN,
88 &pmc_nlogbuffers, 0, "number of global log buffers");
91 * Global log buffer list and associated spin lock.
94 TAILQ_HEAD(, pmclog_buffer) pmc_bufferlist =
95 TAILQ_HEAD_INITIALIZER(pmc_bufferlist);
96 static struct mtx pmc_bufferlist_mtx; /* spin lock */
97 static struct mtx pmc_kthread_mtx; /* sleep lock */
99 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D) do { \
100 const int __roundup = roundup(sizeof(*D), \
102 (D)->plb_fence = ((char *) (D)) + \
103 1024*pmclog_buffer_size; \
104 (D)->plb_base = (D)->plb_ptr = ((char *) (D)) + \
110 * Log file record constructors.
112 #define _PMCLOG_TO_HEADER(T,L) \
113 ((PMCLOG_HEADER_MAGIC << 24) | \
114 (PMCLOG_TYPE_ ## T << 16) | \
117 /* reserve LEN bytes of space and initialize the entry header */
118 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
120 int _len = roundup((LEN), sizeof(uint32_t)); \
121 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
124 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \
125 _le += 3 /* skip over timestamp */
127 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
128 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
129 error=ENOMEM;goto error)
131 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
132 #define PMCLOG_EMIT64(V) do { \
133 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
134 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
138 /* Emit a string. Caution: does NOT update _le, so needs to be last */
139 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
140 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0)
142 #define PMCLOG_DESPATCH(PO) \
143 pmclog_release((PO)); \
148 * Assertions about the log file format.
151 CTASSERT(sizeof(struct pmclog_callchain) == 6*4 +
152 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
153 CTASSERT(sizeof(struct pmclog_closelog) == 3*4);
154 CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4);
155 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX +
156 4*4 + sizeof(uintfptr_t));
157 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
158 4*4 + sizeof(uintfptr_t));
159 CTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t));
160 CTASSERT(sizeof(struct pmclog_pcsample) == 6*4 + sizeof(uintfptr_t));
161 CTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4);
162 CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX);
163 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4);
164 CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4);
165 CTASSERT(sizeof(struct pmclog_proccsw) == 5*4 + 8);
166 CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
168 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 +
170 CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8);
171 CTASSERT(sizeof(struct pmclog_procfork) == 5*4);
172 CTASSERT(sizeof(struct pmclog_sysexit) == 4*4);
173 CTASSERT(sizeof(struct pmclog_userdata) == 4*4);
176 * Log buffer structure
179 struct pmclog_buffer {
180 TAILQ_ENTRY(pmclog_buffer) plb_next;
190 static int pmclog_get_buffer(struct pmc_owner *po);
191 static void pmclog_loop(void *arg);
192 static void pmclog_release(struct pmc_owner *po);
193 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
194 static void pmclog_schedule_io(struct pmc_owner *po);
195 static void pmclog_stop_kthread(struct pmc_owner *po);
206 pmclog_get_buffer(struct pmc_owner *po)
208 struct pmclog_buffer *plb;
210 mtx_assert(&po->po_mtx, MA_OWNED);
212 KASSERT(po->po_curbuf == NULL,
213 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
215 mtx_lock_spin(&pmc_bufferlist_mtx);
216 if ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL)
217 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);
218 mtx_unlock_spin(&pmc_bufferlist_mtx);
220 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
224 KASSERT(plb->plb_ptr == plb->plb_base &&
225 plb->plb_base < plb->plb_fence,
226 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
227 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
228 plb->plb_base, plb->plb_fence));
234 atomic_add_int(&pmc_stats.pm_buffer_requests, 1);
236 atomic_add_int(&pmc_stats.pm_buffer_requests_failed, 1);
238 return (plb ? 0 : ENOMEM);
244 * This function is executed by each pmc owner's helper thread.
248 pmclog_loop(void *arg)
251 struct pmc_owner *po;
252 struct pmclog_buffer *lb;
254 struct ucred *ownercred;
255 struct ucred *mycred;
261 po = (struct pmc_owner *) arg;
264 mycred = td->td_ucred;
267 ownercred = crhold(p->p_ucred);
270 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
271 KASSERT(po->po_kthread == curthread->td_proc,
272 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
273 po, po->po_kthread, curthread->td_proc));
279 * Loop waiting for I/O requests to be added to the owner
280 * struct's queue. The loop is exited when the log file
284 mtx_lock(&pmc_kthread_mtx);
288 /* check if we've been asked to exit */
289 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
292 if (lb == NULL) { /* look for a fresh buffer to write */
293 mtx_lock_spin(&po->po_mtx);
294 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
295 mtx_unlock_spin(&po->po_mtx);
297 /* No more buffers and shutdown required. */
298 if (po->po_flags & PMC_PO_SHUTDOWN) {
299 mtx_unlock(&pmc_kthread_mtx);
301 * Close the file to get PMCLOG_EOF
302 * error in pmclog(3).
304 fo_close(po->po_file, curthread);
305 mtx_lock(&pmc_kthread_mtx);
309 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
314 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
315 mtx_unlock_spin(&po->po_mtx);
318 mtx_unlock(&pmc_kthread_mtx);
320 /* process the request */
321 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
322 lb->plb_base, lb->plb_ptr);
323 /* change our thread's credentials before issuing the I/O */
325 aiov.iov_base = lb->plb_base;
326 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
328 auio.uio_iov = &aiov;
330 auio.uio_offset = -1;
331 auio.uio_resid = nbytes;
332 auio.uio_rw = UIO_WRITE;
333 auio.uio_segflg = UIO_SYSSPACE;
336 /* switch thread credentials -- see kern_ktrace.c */
337 td->td_ucred = ownercred;
338 error = fo_write(po->po_file, &auio, ownercred, 0, td);
339 td->td_ucred = mycred;
342 /* XXX some errors are recoverable */
343 /* send a SIGIO to the owner and exit */
345 kern_psignal(p, SIGIO);
348 mtx_lock(&pmc_kthread_mtx);
350 po->po_error = error; /* save for flush log */
352 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
357 mtx_lock(&pmc_kthread_mtx);
359 /* put the used buffer back into the global pool */
360 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
362 mtx_lock_spin(&pmc_bufferlist_mtx);
363 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
364 mtx_unlock_spin(&pmc_bufferlist_mtx);
369 wakeup_one(po->po_kthread);
370 po->po_kthread = NULL;
372 mtx_unlock(&pmc_kthread_mtx);
374 /* return the current I/O buffer to the global pool */
376 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
378 mtx_lock_spin(&pmc_bufferlist_mtx);
379 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
380 mtx_unlock_spin(&pmc_bufferlist_mtx);
384 * Exit this thread, signalling the waiter
393 * Release and log entry and schedule an I/O if needed.
397 pmclog_release(struct pmc_owner *po)
399 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
400 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
401 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
402 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
403 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
404 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
406 /* schedule an I/O if we've filled a buffer */
407 if (po->po_curbuf->plb_ptr >= po->po_curbuf->plb_fence)
408 pmclog_schedule_io(po);
410 mtx_unlock_spin(&po->po_mtx);
412 PMCDBG1(LOG,REL,1, "po=%p", po);
417 * Attempt to reserve 'length' bytes of space in an owner's log
418 * buffer. The function returns a pointer to 'length' bytes of space
419 * if there was enough space or returns NULL if no space was
420 * available. Non-null returns do so with the po mutex locked. The
421 * caller must invoke pmclog_release() on the pmc owner structure
426 pmclog_reserve(struct pmc_owner *po, int length)
428 uintptr_t newptr, oldptr;
432 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
434 KASSERT(length % sizeof(uint32_t) == 0,
435 ("[pmclog,%d] length not a multiple of word size", __LINE__));
437 mtx_lock_spin(&po->po_mtx);
439 /* No more data when shutdown in progress. */
440 if (po->po_flags & PMC_PO_SHUTDOWN) {
441 mtx_unlock_spin(&po->po_mtx);
445 if (po->po_curbuf == NULL)
446 if (pmclog_get_buffer(po) != 0) {
447 mtx_unlock_spin(&po->po_mtx);
451 KASSERT(po->po_curbuf != NULL,
452 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
454 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base &&
455 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
456 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
457 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
458 po->po_curbuf->plb_fence));
460 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
461 newptr = oldptr + length;
463 KASSERT(oldptr != (uintptr_t) NULL,
464 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
467 * If we have space in the current buffer, return a pointer to
468 * available space with the PO structure locked.
470 if (newptr <= (uintptr_t) po->po_curbuf->plb_fence) {
471 po->po_curbuf->plb_ptr = (char *) newptr;
476 * Otherwise, schedule the current buffer for output and get a
479 pmclog_schedule_io(po);
481 if (pmclog_get_buffer(po) != 0) {
482 mtx_unlock_spin(&po->po_mtx);
486 KASSERT(po->po_curbuf != NULL,
487 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
489 KASSERT(po->po_curbuf->plb_ptr != NULL,
490 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
492 KASSERT(po->po_curbuf->plb_ptr == po->po_curbuf->plb_base &&
493 po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
494 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
495 __LINE__, po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base,
496 po->po_curbuf->plb_fence));
498 oldptr = (uintptr_t) po->po_curbuf->plb_ptr;
501 lh = (uint32_t *) oldptr;
502 lh++; /* skip header */
503 getnanotime(&ts); /* fill in the timestamp */
504 *lh++ = ts.tv_sec & 0xFFFFFFFF;
505 *lh++ = ts.tv_nsec & 0xFFFFFFF;
506 return ((uint32_t *) oldptr);
512 * Transfer the current buffer to the helper kthread.
516 pmclog_schedule_io(struct pmc_owner *po)
518 KASSERT(po->po_curbuf != NULL,
519 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
521 KASSERT(po->po_curbuf->plb_ptr >= po->po_curbuf->plb_base,
522 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
523 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_base));
524 KASSERT(po->po_curbuf->plb_ptr <= po->po_curbuf->plb_fence,
525 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
526 po, po->po_curbuf->plb_ptr, po->po_curbuf->plb_fence));
528 PMCDBG1(LOG,SIO, 1, "po=%p", po);
530 mtx_assert(&po->po_mtx, MA_OWNED);
533 * Add the current buffer to the tail of the buffer list and
536 TAILQ_INSERT_TAIL(&po->po_logbuffers, po->po_curbuf, plb_next);
537 po->po_curbuf = NULL;
542 * Stop the helper kthread.
546 pmclog_stop_kthread(struct pmc_owner *po)
549 * Close the file to force the thread out of fo_write,
550 * unset flag, wakeup the helper thread,
551 * wait for it to exit
554 if (po->po_file != NULL)
555 fo_close(po->po_file, curthread);
557 mtx_lock(&pmc_kthread_mtx);
558 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
561 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
562 mtx_unlock(&pmc_kthread_mtx);
570 * Configure a log file for pmc owner 'po'.
572 * Parameter 'logfd' is a file handle referencing an open file in the
573 * owner process. This file needs to have been opened for writing.
577 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
583 * As long as it is possible to get a LOR between pmc_sx lock and
584 * proctree/allproc sx locks used for adding a new process, assure
585 * the former is not held here.
587 sx_assert(&pmc_sx, SA_UNLOCKED);
588 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
592 /* return EBUSY if a log file was already present */
593 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
596 KASSERT(po->po_kthread == NULL,
597 ("[pmclog,%d] po=%p kthread (%p) already present", __LINE__, po,
599 KASSERT(po->po_file == NULL,
600 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
603 /* get a reference to the file state */
604 error = fget_write(curthread, logfd,
605 cap_rights_init(&rights, CAP_WRITE), &po->po_file);
609 /* mark process as owning a log file */
610 po->po_flags |= PMC_PO_OWNS_LOGFILE;
611 error = kproc_create(pmclog_loop, po, &po->po_kthread,
612 RFHIGHPID, 0, "hwpmc: proc(%d)", p->p_pid);
616 /* mark process as using HWPMCs */
618 p->p_flag |= P_HWPMC;
621 /* create a log initialization entry */
622 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
623 sizeof(struct pmclog_initialize));
624 PMCLOG_EMIT32(PMC_VERSION);
625 PMCLOG_EMIT32(md->pmd_cputype);
631 /* shutdown the thread */
633 pmclog_stop_kthread(po);
635 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
636 "stopped", __LINE__, po));
639 (void) fdrop(po->po_file, curthread);
640 po->po_file = NULL; /* clear file and error state */
648 * De-configure a log file. This will throw away any buffers queued
649 * for this owner process.
653 pmclog_deconfigure_log(struct pmc_owner *po)
656 struct pmclog_buffer *lb;
658 PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
660 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
663 KASSERT(po->po_sscount == 0,
664 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
665 KASSERT(po->po_file != NULL,
666 ("[pmclog,%d] po=%p no log file", __LINE__, po));
668 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
669 pmclog_stop_kthread(po);
671 KASSERT(po->po_kthread == NULL,
672 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
674 /* return all queued log buffers to the global pool */
675 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
676 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
677 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
678 mtx_lock_spin(&pmc_bufferlist_mtx);
679 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
680 mtx_unlock_spin(&pmc_bufferlist_mtx);
683 /* return the 'current' buffer to the global pool */
684 if ((lb = po->po_curbuf) != NULL) {
685 PMCLOG_INIT_BUFFER_DESCRIPTOR(lb);
686 mtx_lock_spin(&pmc_bufferlist_mtx);
687 TAILQ_INSERT_HEAD(&pmc_bufferlist, lb, plb_next);
688 mtx_unlock_spin(&pmc_bufferlist_mtx);
691 /* drop a reference to the fd */
692 error = fdrop(po->po_file, curthread);
700 * Flush a process' log buffer.
704 pmclog_flush(struct pmc_owner *po)
707 struct pmclog_buffer *lb;
709 PMCDBG1(LOG,FLS,1, "po=%p", po);
712 * If there is a pending error recorded by the logger thread,
716 return (po->po_error);
721 * Check that we do have an active log file.
723 mtx_lock(&pmc_kthread_mtx);
724 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
730 * Schedule the current buffer if any and not empty.
732 mtx_lock_spin(&po->po_mtx);
734 if (lb && lb->plb_ptr != lb->plb_base) {
735 pmclog_schedule_io(po);
738 mtx_unlock_spin(&po->po_mtx);
741 mtx_unlock(&pmc_kthread_mtx);
747 pmclog_close(struct pmc_owner *po)
750 PMCDBG1(LOG,CLO,1, "po=%p", po);
752 mtx_lock(&pmc_kthread_mtx);
755 * Schedule the current buffer.
757 mtx_lock_spin(&po->po_mtx);
759 pmclog_schedule_io(po);
762 mtx_unlock_spin(&po->po_mtx);
765 * Initiate shutdown: no new data queued,
766 * thread will close file on last block.
768 po->po_flags |= PMC_PO_SHUTDOWN;
770 mtx_unlock(&pmc_kthread_mtx);
776 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
780 struct pmc_owner *po;
782 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
785 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
786 ps->ps_nsamples * sizeof(uintfptr_t);
788 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
789 PMCLOG_RESERVE(po, CALLCHAIN, recordlen);
790 PMCLOG_EMIT32(ps->ps_pid);
791 PMCLOG_EMIT32(pm->pm_id);
792 PMCLOG_EMIT32(flags);
793 for (n = 0; n < ps->ps_nsamples; n++)
794 PMCLOG_EMITADDR(ps->ps_pc[n]);
799 pmclog_process_closelog(struct pmc_owner *po)
801 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
806 pmclog_process_dropnotify(struct pmc_owner *po)
808 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
813 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
816 int pathlen, recordlen;
818 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
820 pathlen = strlen(path) + 1; /* #bytes for path name */
821 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
824 PMCLOG_RESERVE(po, MAP_IN, recordlen);
826 PMCLOG_EMITADDR(start);
827 PMCLOG_EMITSTRING(path,pathlen);
832 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
835 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
837 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
839 PMCLOG_EMITADDR(start);
840 PMCLOG_EMITADDR(end);
845 pmclog_process_pmcallocate(struct pmc *pm)
847 struct pmc_owner *po;
852 PMCDBG1(LOG,ALL,1, "pm=%p", pm);
854 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
855 PMCLOG_RESERVE(po, PMCALLOCATEDYN,
856 sizeof(struct pmclog_pmcallocatedyn));
857 PMCLOG_EMIT32(pm->pm_id);
858 PMCLOG_EMIT32(pm->pm_event);
859 PMCLOG_EMIT32(pm->pm_flags);
860 ps = pmc_soft_ev_acquire(pm->pm_event);
862 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
864 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
865 pmc_soft_ev_release(ps);
868 PMCLOG_RESERVE(po, PMCALLOCATE,
869 sizeof(struct pmclog_pmcallocate));
870 PMCLOG_EMIT32(pm->pm_id);
871 PMCLOG_EMIT32(pm->pm_event);
872 PMCLOG_EMIT32(pm->pm_flags);
878 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
880 int pathlen, recordlen;
881 struct pmc_owner *po;
883 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
887 pathlen = strlen(path) + 1; /* #bytes for the string */
888 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
890 PMCLOG_RESERVE(po, PMCATTACH, recordlen);
891 PMCLOG_EMIT32(pm->pm_id);
893 PMCLOG_EMITSTRING(path, pathlen);
898 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
900 struct pmc_owner *po;
902 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
906 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
907 PMCLOG_EMIT32(pm->pm_id);
913 * Log a context switch event to the log file.
917 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v)
919 struct pmc_owner *po;
921 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
922 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
924 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
929 PMCLOG_RESERVE(po, PROCCSW, sizeof(struct pmclog_proccsw));
930 PMCLOG_EMIT32(pm->pm_id);
932 PMCLOG_EMIT32(pp->pp_proc->p_pid);
937 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
938 uintfptr_t startaddr, char *path)
940 int pathlen, recordlen;
942 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
944 pathlen = strlen(path) + 1; /* #bytes for the path */
945 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
947 PMCLOG_RESERVE(po, PROCEXEC, recordlen);
949 PMCLOG_EMITADDR(startaddr);
951 PMCLOG_EMITSTRING(path,pathlen);
956 * Log a process exit event (and accumulated pmc value) to the log file.
960 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
963 struct pmc_owner *po;
965 ri = PMC_TO_ROWINDEX(pm);
966 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
967 pp->pp_pmcs[ri].pp_pmcval);
971 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
972 PMCLOG_EMIT32(pm->pm_id);
973 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
974 PMCLOG_EMIT32(pp->pp_proc->p_pid);
983 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
985 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
986 PMCLOG_EMIT32(oldpid);
987 PMCLOG_EMIT32(newpid);
992 * Log a process exit event of the form suitable for system-wide PMCs.
996 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
998 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
1000 PMCLOG_DESPATCH(po);
1004 * Write a user log entry.
1008 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
1012 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
1016 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
1017 sizeof(struct pmclog_userdata));
1018 PMCLOG_EMIT32(wl->pm_userdata);
1019 PMCLOG_DESPATCH(po);
1028 * Create a pool of log buffers and initialize mutexes.
1035 struct pmclog_buffer *plb;
1037 if (pmclog_buffer_size <= 0) {
1038 (void) printf("hwpmc: tunable logbuffersize=%d must be "
1039 "greater than zero.\n", pmclog_buffer_size);
1040 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1043 if (pmc_nlogbuffers <= 0) {
1044 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
1045 "than zero.\n", pmc_nlogbuffers);
1046 pmc_nlogbuffers = PMC_NLOGBUFFERS;
1049 /* create global pool of log buffers */
1050 for (n = 0; n < pmc_nlogbuffers; n++) {
1051 plb = malloc(1024 * pmclog_buffer_size, M_PMC,
1053 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb);
1054 TAILQ_INSERT_HEAD(&pmc_bufferlist, plb, plb_next);
1056 mtx_init(&pmc_bufferlist_mtx, "pmc-buffer-list", "pmc-leaf",
1058 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1064 * Destroy mutexes and release memory back the to free pool.
1070 struct pmclog_buffer *plb;
1072 mtx_destroy(&pmc_kthread_mtx);
1073 mtx_destroy(&pmc_bufferlist_mtx);
1075 while ((plb = TAILQ_FIRST(&pmc_bufferlist)) != NULL) {
1076 TAILQ_REMOVE(&pmc_bufferlist, plb, plb_next);