2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005-2007 Joseph Koshy
5 * Copyright (c) 2007 The FreeBSD Foundation
6 * Copyright (c) 2018 Matthew Macy
9 * Portions of this software were developed by A. Joseph Koshy under
10 * sponsorship from the FreeBSD Foundation and Google, Inc.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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.
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
36 * Logging code for hwpmc(4)
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
42 #include <sys/param.h>
43 #include <sys/capsicum.h>
45 #include <sys/kernel.h>
46 #include <sys/kthread.h>
48 #include <sys/module.h>
49 #include <sys/mutex.h>
51 #include <sys/pmckern.h>
52 #include <sys/pmclog.h>
54 #include <sys/sched.h>
55 #include <sys/signalvar.h>
57 #include <sys/syscallsubr.h>
58 #include <sys/sysctl.h>
59 #include <sys/systm.h>
61 #include <sys/unistd.h>
62 #include <sys/vnode.h>
65 #define NDOMAINS vm_ndomains
66 #define curdomain PCPU_GET(domain)
70 #define malloc_domain(size, type, domain, flags) malloc((size), (type), (flags))
71 #define free_domain(addr, type) free(addr, type)
78 SYSCTL_DECL(_kern_hwpmc);
81 * kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
84 static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
85 #if (__FreeBSD_version < 1100000)
86 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size);
88 SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
89 &pmclog_buffer_size, 0, "size of log buffers in kilobytes");
92 * kern.hwpmc.nbuffer -- number of global log buffers
95 static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
96 #if (__FreeBSD_version < 1100000)
97 TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu);
99 SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN,
100 &pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu");
103 * Global log buffer list and associated spin lock.
106 static struct mtx pmc_kthread_mtx; /* sleep lock */
108 #define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \
109 (D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \
110 (D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \
111 (D)->plb_domain = domain; \
114 #define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \
115 (D)->plb_ptr = (D)->plb_base; \
119 * Log file record constructors.
121 #define _PMCLOG_TO_HEADER(T,L) \
122 ((PMCLOG_HEADER_MAGIC << 24) | \
123 (PMCLOG_TYPE_ ## T << 16) | \
126 /* reserve LEN bytes of space and initialize the entry header */
127 #define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION) do { \
129 int _len = roundup((LEN), sizeof(uint32_t)); \
130 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
133 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \
134 _le += 3 /* skip over timestamp */
136 /* reserve LEN bytes of space and initialize the entry header */
137 #define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
139 int _len = roundup((LEN), sizeof(uint32_t)); \
141 if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
145 *_le = _PMCLOG_TO_HEADER(TYPE,_len); \
146 _le += 3 /* skip over timestamp */
149 #define PMCLOG_RESERVE_SAFE(P,T,L) _PMCLOG_RESERVE_SAFE(P,T,L,return)
150 #define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
151 #define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
152 error=ENOMEM;goto error)
154 #define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
155 #define PMCLOG_EMIT64(V) do { \
156 *_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
157 *_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
161 /* Emit a string. Caution: does NOT update _le, so needs to be last */
162 #define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
163 #define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0)
165 #define PMCLOG_DESPATCH_SAFE(PO) \
166 pmclog_release((PO)); \
169 #define PMCLOG_DESPATCH_SCHED_LOCK(PO) \
170 pmclog_release_flags((PO), 0); \
173 #define PMCLOG_DESPATCH(PO) \
174 pmclog_release((PO)); \
178 #define PMCLOG_DESPATCH_SYNC(PO) \
179 pmclog_schedule_io((PO), 1); \
185 * Assertions about the log file format.
188 CTASSERT(sizeof(struct pmclog_callchain) == 8*4 +
189 PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
190 CTASSERT(sizeof(struct pmclog_closelog) == 4*4);
191 CTASSERT(sizeof(struct pmclog_dropnotify) == 4*4);
192 CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX +
193 4*4 + sizeof(uintfptr_t));
194 CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
195 4*4 + sizeof(uintfptr_t));
196 CTASSERT(sizeof(struct pmclog_map_out) == 4*4 + 2*sizeof(uintfptr_t));
197 CTASSERT(sizeof(struct pmclog_pmcallocate) == 6*4);
198 CTASSERT(sizeof(struct pmclog_pmcattach) == 6*4 + PATH_MAX);
199 CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 6*4);
200 CTASSERT(sizeof(struct pmclog_pmcdetach) == 6*4);
201 CTASSERT(sizeof(struct pmclog_proccsw) == 6*4 + 8);
202 CTASSERT(sizeof(struct pmclog_procexec) == 6*4 + PATH_MAX +
204 CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 6*4 +
206 CTASSERT(sizeof(struct pmclog_procexit) == 6*4 + 8);
207 CTASSERT(sizeof(struct pmclog_procfork) == 6*4);
208 CTASSERT(sizeof(struct pmclog_sysexit) == 4*4);
209 CTASSERT(sizeof(struct pmclog_userdata) == 4*4);
212 * Log buffer structure
215 struct pmclog_buffer {
216 TAILQ_ENTRY(pmclog_buffer) plb_next;
221 } __aligned(CACHE_LINE_SIZE);
227 static int pmclog_get_buffer(struct pmc_owner *po);
228 static void pmclog_loop(void *arg);
229 static void pmclog_release(struct pmc_owner *po);
230 static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
231 static void pmclog_schedule_io(struct pmc_owner *po, int wakeup);
232 static void pmclog_schedule_all(struct pmc_owner *po, int force);
233 static void pmclog_stop_kthread(struct pmc_owner *po);
240 pmc_plb_rele_unlocked(struct pmclog_buffer *plb)
242 TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next);
246 pmc_plb_rele(struct pmclog_buffer *plb)
248 mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
249 pmc_plb_rele_unlocked(plb);
250 mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
257 pmclog_get_buffer(struct pmc_owner *po)
259 struct pmclog_buffer *plb;
262 KASSERT(po->po_curbuf[curcpu] == NULL,
263 ("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
266 MPASS(pmc_dom_hdrs[domain]);
267 mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
268 if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL)
269 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
270 mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
272 PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
276 KASSERT(plb->plb_ptr == plb->plb_base &&
277 plb->plb_base < plb->plb_fence,
278 ("[pmclog,%d] po=%p buffer invariants: ptr=%p "
279 "base=%p fence=%p", __LINE__, po, plb->plb_ptr,
280 plb->plb_base, plb->plb_fence));
283 po->po_curbuf[curcpu] = plb;
286 counter_u64_add(pmc_stats.pm_buffer_requests, 1);
288 counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1);
290 return (plb ? 0 : ENOMEM);
293 struct pmclog_proc_init_args {
295 struct pmc_owner *po;
301 pmclog_proc_create(struct thread *td, void **handlep)
303 struct pmclog_proc_init_args *ia;
306 ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO);
307 error = kproc_create(pmclog_loop, ia, &ia->kthr,
308 RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid);
315 pmclog_proc_ignite(void *handle, struct pmc_owner *po)
317 struct pmclog_proc_init_args *ia;
320 mtx_lock(&pmc_kthread_mtx);
322 MPASS(ia->po == NULL);
324 MPASS(ia->kthr != NULL);
329 KASSERT(po->po_kthread == NULL,
330 ("[pmclog,%d] po=%p kthread (%p) already present",
331 __LINE__, po, po->po_kthread));
332 po->po_kthread = ia->kthr;
336 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0);
337 mtx_unlock(&pmc_kthread_mtx);
344 * This function is executed by each pmc owner's helper thread.
347 pmclog_loop(void *arg)
349 struct pmclog_proc_init_args *ia;
350 struct pmc_owner *po;
351 struct pmclog_buffer *lb;
353 struct ucred *ownercred;
354 struct ucred *mycred;
365 SIGADDSET(unb, SIGHUP);
366 (void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0);
369 MPASS(ia->kthr == curproc);
371 mtx_lock(&pmc_kthread_mtx);
372 while (ia->po == NULL && !ia->exit)
373 msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0);
377 mtx_unlock(&pmc_kthread_mtx);
380 MPASS(ia->po != NULL);
384 mtx_unlock(&pmc_kthread_mtx);
388 mycred = td->td_ucred;
391 ownercred = crhold(p->p_ucred);
394 PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
395 KASSERT(po->po_kthread == curthread->td_proc,
396 ("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
397 po, po->po_kthread, curthread->td_proc));
403 * Loop waiting for I/O requests to be added to the owner
404 * struct's queue. The loop is exited when the log file
408 mtx_lock(&pmc_kthread_mtx);
412 /* check if we've been asked to exit */
413 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
416 if (lb == NULL) { /* look for a fresh buffer to write */
417 mtx_lock_spin(&po->po_mtx);
418 if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
419 mtx_unlock_spin(&po->po_mtx);
421 /* No more buffers and shutdown required. */
422 if (po->po_flags & PMC_PO_SHUTDOWN)
425 (void) msleep(po, &pmc_kthread_mtx, PWAIT,
430 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
431 mtx_unlock_spin(&po->po_mtx);
434 mtx_unlock(&pmc_kthread_mtx);
436 /* process the request */
437 PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
438 lb->plb_base, lb->plb_ptr);
439 /* change our thread's credentials before issuing the I/O */
441 aiov.iov_base = lb->plb_base;
442 aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
444 auio.uio_iov = &aiov;
446 auio.uio_offset = -1;
447 auio.uio_resid = nbytes;
448 auio.uio_rw = UIO_WRITE;
449 auio.uio_segflg = UIO_SYSSPACE;
452 /* switch thread credentials -- see kern_ktrace.c */
453 td->td_ucred = ownercred;
454 error = fo_write(po->po_file, &auio, ownercred, 0, td);
455 td->td_ucred = mycred;
458 /* XXX some errors are recoverable */
459 /* send a SIGIO to the owner and exit */
461 kern_psignal(p, SIGIO);
464 mtx_lock(&pmc_kthread_mtx);
466 po->po_error = error; /* save for flush log */
468 PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
473 mtx_lock(&pmc_kthread_mtx);
475 /* put the used buffer back into the global pool */
476 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
482 wakeup_one(po->po_kthread);
483 po->po_kthread = NULL;
485 mtx_unlock(&pmc_kthread_mtx);
487 /* return the current I/O buffer to the global pool */
489 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
495 * Exit this thread, signalling the waiter
504 * Release and log entry and schedule an I/O if needed.
508 pmclog_release_flags(struct pmc_owner *po, int wakeup)
510 struct pmclog_buffer *plb;
512 plb = po->po_curbuf[curcpu];
513 KASSERT(plb->plb_ptr >= plb->plb_base,
514 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
515 po, plb->plb_ptr, plb->plb_base));
516 KASSERT(plb->plb_ptr <= plb->plb_fence,
517 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
518 po, plb->plb_ptr, plb->plb_fence));
520 /* schedule an I/O if we've filled a buffer */
521 if (plb->plb_ptr >= plb->plb_fence)
522 pmclog_schedule_io(po, wakeup);
524 PMCDBG1(LOG,REL,1, "po=%p", po);
528 pmclog_release(struct pmc_owner *po)
531 pmclog_release_flags(po, 1);
536 * Attempt to reserve 'length' bytes of space in an owner's log
537 * buffer. The function returns a pointer to 'length' bytes of space
538 * if there was enough space or returns NULL if no space was
539 * available. Non-null returns do so with the po mutex locked. The
540 * caller must invoke pmclog_release() on the pmc owner structure
545 pmclog_reserve(struct pmc_owner *po, int length)
547 uintptr_t newptr, oldptr;
550 struct pmclog_buffer *plb, **pplb;
552 PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
554 KASSERT(length % sizeof(uint32_t) == 0,
555 ("[pmclog,%d] length not a multiple of word size", __LINE__));
557 /* No more data when shutdown in progress. */
558 if (po->po_flags & PMC_PO_SHUTDOWN)
561 pplb = &po->po_curbuf[curcpu];
562 if (*pplb == NULL && pmclog_get_buffer(po) != 0)
565 KASSERT(*pplb != NULL,
566 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
569 KASSERT(plb->plb_ptr >= plb->plb_base &&
570 plb->plb_ptr <= plb->plb_fence,
571 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
572 __LINE__, po, plb->plb_ptr, plb->plb_base,
575 oldptr = (uintptr_t) plb->plb_ptr;
576 newptr = oldptr + length;
578 KASSERT(oldptr != (uintptr_t) NULL,
579 ("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
582 * If we have space in the current buffer, return a pointer to
583 * available space with the PO structure locked.
585 if (newptr <= (uintptr_t) plb->plb_fence) {
586 plb->plb_ptr = (char *) newptr;
591 * Otherwise, schedule the current buffer for output and get a
594 pmclog_schedule_io(po, 0);
596 if (pmclog_get_buffer(po) != 0)
601 ("[pmclog,%d] po=%p no current buffer", __LINE__, po));
603 KASSERT(plb->plb_ptr != NULL,
604 ("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
606 KASSERT(plb->plb_ptr == plb->plb_base &&
607 plb->plb_ptr <= plb->plb_fence,
608 ("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
609 __LINE__, po, plb->plb_ptr, plb->plb_base,
612 oldptr = (uintptr_t) plb->plb_ptr;
615 lh = (uint32_t *) oldptr;
616 lh++; /* skip header */
617 getnanotime(&ts); /* fill in the timestamp */
618 *lh++ = ts.tv_sec & 0xFFFFFFFF;
619 *lh++ = ts.tv_nsec & 0xFFFFFFF;
620 return ((uint32_t *) oldptr);
628 * Transfer the current buffer to the helper kthread.
632 pmclog_schedule_io(struct pmc_owner *po, int wakeup)
634 struct pmclog_buffer *plb;
636 plb = po->po_curbuf[curcpu];
637 po->po_curbuf[curcpu] = NULL;
639 ("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
640 KASSERT(plb->plb_ptr >= plb->plb_base,
641 ("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
642 po, plb->plb_ptr, plb->plb_base));
643 KASSERT(plb->plb_ptr <= plb->plb_fence,
644 ("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
645 po, plb->plb_ptr, plb->plb_fence));
647 PMCDBG1(LOG,SIO, 1, "po=%p", po);
650 * Add the current buffer to the tail of the buffer list and
653 mtx_lock_spin(&po->po_mtx);
654 TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next);
655 mtx_unlock_spin(&po->po_mtx);
661 * Stop the helper kthread.
665 pmclog_stop_kthread(struct pmc_owner *po)
668 mtx_lock(&pmc_kthread_mtx);
669 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
670 if (po->po_kthread != NULL) {
671 PROC_LOCK(po->po_kthread);
672 kern_psignal(po->po_kthread, SIGHUP);
673 PROC_UNLOCK(po->po_kthread);
676 while (po->po_kthread)
677 msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
678 mtx_unlock(&pmc_kthread_mtx);
686 * Configure a log file for pmc owner 'po'.
688 * Parameter 'logfd' is a file handle referencing an open file in the
689 * owner process. This file needs to have been opened for writing.
693 pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
698 sx_assert(&pmc_sx, SA_XLOCKED);
699 PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
703 /* return EBUSY if a log file was already present */
704 if (po->po_flags & PMC_PO_OWNS_LOGFILE)
707 KASSERT(po->po_file == NULL,
708 ("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
711 /* get a reference to the file state */
712 error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file);
716 /* mark process as owning a log file */
717 po->po_flags |= PMC_PO_OWNS_LOGFILE;
719 /* mark process as using HWPMCs */
721 p->p_flag |= P_HWPMC;
724 /* create a log initialization entry */
725 PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
726 sizeof(struct pmclog_initialize));
727 PMCLOG_EMIT32(PMC_VERSION);
728 PMCLOG_EMIT32(md->pmd_cputype);
729 PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN);
730 PMCLOG_DESPATCH_SYNC(po);
735 KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
736 "stopped", __LINE__, po));
739 (void) fdrop(po->po_file, curthread);
740 po->po_file = NULL; /* clear file and error state */
742 po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
749 * De-configure a log file. This will throw away any buffers queued
750 * for this owner process.
754 pmclog_deconfigure_log(struct pmc_owner *po)
757 struct pmclog_buffer *lb;
759 PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
761 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
764 KASSERT(po->po_sscount == 0,
765 ("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
766 KASSERT(po->po_file != NULL,
767 ("[pmclog,%d] po=%p no log file", __LINE__, po));
769 /* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
770 pmclog_stop_kthread(po);
772 KASSERT(po->po_kthread == NULL,
773 ("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
775 /* return all queued log buffers to the global pool */
776 while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
777 TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
778 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
781 for (int i = 0; i < mp_ncpus; i++) {
782 thread_lock(curthread);
783 sched_bind(curthread, i);
784 thread_unlock(curthread);
785 /* return the 'current' buffer to the global pool */
786 if ((lb = po->po_curbuf[curcpu]) != NULL) {
787 PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
791 thread_lock(curthread);
792 sched_unbind(curthread);
793 thread_unlock(curthread);
795 /* drop a reference to the fd */
796 if (po->po_file != NULL) {
797 error = fdrop(po->po_file, curthread);
807 * Flush a process' log buffer.
811 pmclog_flush(struct pmc_owner *po, int force)
815 PMCDBG1(LOG,FLS,1, "po=%p", po);
818 * If there is a pending error recorded by the logger thread,
822 return (po->po_error);
827 * Check that we do have an active log file.
829 mtx_lock(&pmc_kthread_mtx);
830 if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
835 pmclog_schedule_all(po, force);
837 mtx_unlock(&pmc_kthread_mtx);
843 pmclog_schedule_one_cond(struct pmc_owner *po, int force)
845 struct pmclog_buffer *plb;
850 /* tell hardclock not to run again */
851 if (PMC_CPU_HAS_SAMPLES(cpu))
852 PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
854 pmc_flush_samples(cpu);
855 plb = po->po_curbuf[cpu];
856 if (plb && plb->plb_ptr != plb->plb_base)
857 pmclog_schedule_io(po, 1);
862 pmclog_schedule_all(struct pmc_owner *po, int force)
865 * Schedule the current buffer if any and not empty.
867 for (int i = 0; i < mp_ncpus; i++) {
868 thread_lock(curthread);
869 sched_bind(curthread, i);
870 thread_unlock(curthread);
871 pmclog_schedule_one_cond(po, force);
873 thread_lock(curthread);
874 sched_unbind(curthread);
875 thread_unlock(curthread);
879 pmclog_close(struct pmc_owner *po)
882 PMCDBG1(LOG,CLO,1, "po=%p", po);
884 pmclog_process_closelog(po);
886 mtx_lock(&pmc_kthread_mtx);
888 * Initiate shutdown: no new data queued,
889 * thread will close file on last block.
891 po->po_flags |= PMC_PO_SHUTDOWN;
892 /* give time for all to see */
896 * Schedule the current buffer.
898 pmclog_schedule_all(po, 0);
901 mtx_unlock(&pmc_kthread_mtx);
907 pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
911 struct pmc_owner *po;
913 PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
916 recordlen = offsetof(struct pmclog_callchain, pl_pc) +
917 ps->ps_nsamples * sizeof(uintfptr_t);
919 flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
920 PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen);
921 PMCLOG_EMIT32(ps->ps_pid);
922 PMCLOG_EMIT32(ps->ps_tid);
923 PMCLOG_EMIT32(pm->pm_id);
924 PMCLOG_EMIT32(flags);
927 for (n = 0; n < ps->ps_nsamples; n++)
928 PMCLOG_EMITADDR(ps->ps_pc[n]);
929 PMCLOG_DESPATCH_SAFE(po);
933 pmclog_process_closelog(struct pmc_owner *po)
935 PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
936 PMCLOG_DESPATCH_SYNC(po);
940 pmclog_process_dropnotify(struct pmc_owner *po)
942 PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
947 pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
950 int pathlen, recordlen;
952 KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
954 pathlen = strlen(path) + 1; /* #bytes for path name */
955 recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
958 PMCLOG_RESERVE(po, MAP_IN, recordlen);
960 PMCLOG_EMITADDR(start);
961 PMCLOG_EMITSTRING(path,pathlen);
962 PMCLOG_DESPATCH_SYNC(po);
966 pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
969 KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
971 PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
973 PMCLOG_EMITADDR(start);
974 PMCLOG_EMITADDR(end);
979 pmclog_process_pmcallocate(struct pmc *pm)
981 struct pmc_owner *po;
986 PMCDBG1(LOG,ALL,1, "pm=%p", pm);
988 if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
989 PMCLOG_RESERVE(po, PMCALLOCATEDYN,
990 sizeof(struct pmclog_pmcallocatedyn));
991 PMCLOG_EMIT32(pm->pm_id);
992 PMCLOG_EMIT32(pm->pm_event);
993 PMCLOG_EMIT32(pm->pm_flags);
994 ps = pmc_soft_ev_acquire(pm->pm_event);
996 PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
998 PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
999 pmc_soft_ev_release(ps);
1000 PMCLOG_DESPATCH_SYNC(po);
1002 PMCLOG_RESERVE(po, PMCALLOCATE,
1003 sizeof(struct pmclog_pmcallocate));
1004 PMCLOG_EMIT32(pm->pm_id);
1005 PMCLOG_EMIT32(pm->pm_event);
1006 PMCLOG_EMIT32(pm->pm_flags);
1007 PMCLOG_DESPATCH_SYNC(po);
1012 pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
1014 int pathlen, recordlen;
1015 struct pmc_owner *po;
1017 PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
1021 pathlen = strlen(path) + 1; /* #bytes for the string */
1022 recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
1024 PMCLOG_RESERVE(po, PMCATTACH, recordlen);
1025 PMCLOG_EMIT32(pm->pm_id);
1028 PMCLOG_EMITSTRING(path, pathlen);
1029 PMCLOG_DESPATCH_SYNC(po);
1033 pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
1035 struct pmc_owner *po;
1037 PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
1041 PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
1042 PMCLOG_EMIT32(pm->pm_id);
1044 PMCLOG_DESPATCH_SYNC(po);
1048 pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync)
1051 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate));
1052 PMCLOG_EMIT32(p->p_pid);
1053 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
1054 PMCLOG_DESPATCH_SYNC(po);
1056 PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate));
1057 PMCLOG_EMIT32(p->p_pid);
1058 PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
1059 PMCLOG_DESPATCH(po);
1064 * Log a context switch event to the log file.
1068 pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td)
1070 struct pmc_owner *po;
1072 KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
1073 ("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
1075 PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1080 PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw));
1081 PMCLOG_EMIT32(pm->pm_id);
1083 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1084 PMCLOG_EMIT32(td->td_tid);
1085 PMCLOG_DESPATCH_SCHED_LOCK(po);
1089 pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
1090 uintfptr_t startaddr, char *path)
1092 int pathlen, recordlen;
1094 PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
1096 pathlen = strlen(path) + 1; /* #bytes for the path */
1097 recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
1098 PMCLOG_RESERVE(po, PROCEXEC, recordlen);
1100 PMCLOG_EMIT32(pmid);
1102 PMCLOG_EMITADDR(startaddr);
1103 PMCLOG_EMITSTRING(path,pathlen);
1104 PMCLOG_DESPATCH_SYNC(po);
1108 * Log a process exit event (and accumulated pmc value) to the log file.
1112 pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
1115 struct pmc_owner *po;
1117 ri = PMC_TO_ROWINDEX(pm);
1118 PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
1119 pp->pp_pmcs[ri].pp_pmcval);
1123 PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
1124 PMCLOG_EMIT32(pm->pm_id);
1125 PMCLOG_EMIT32(pp->pp_proc->p_pid);
1127 PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
1128 PMCLOG_DESPATCH(po);
1136 pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
1138 PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
1139 PMCLOG_EMIT32(oldpid);
1140 PMCLOG_EMIT32(newpid);
1141 PMCLOG_DESPATCH(po);
1145 * Log a process exit event of the form suitable for system-wide PMCs.
1149 pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
1151 PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
1153 PMCLOG_DESPATCH(po);
1157 pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync)
1163 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate));
1164 PMCLOG_EMIT32(td->td_tid);
1165 PMCLOG_EMIT32(p->p_pid);
1167 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
1168 PMCLOG_DESPATCH_SYNC(po);
1170 PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate));
1171 PMCLOG_EMIT32(td->td_tid);
1172 PMCLOG_EMIT32(p->p_pid);
1174 PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
1175 PMCLOG_DESPATCH(po);
1180 pmclog_process_threadexit(struct pmc_owner *po, struct thread *td)
1183 PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit));
1184 PMCLOG_EMIT32(td->td_tid);
1185 PMCLOG_DESPATCH(po);
1189 * Write a user log entry.
1193 pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
1197 PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
1201 PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
1202 sizeof(struct pmclog_userdata));
1203 PMCLOG_EMIT32(wl->pm_userdata);
1204 PMCLOG_DESPATCH(po);
1213 * Create a pool of log buffers and initialize mutexes.
1220 struct pmclog_buffer *plb;
1222 if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) {
1223 (void) printf("hwpmc: tunable logbuffersize=%d must be "
1224 "greater than zero and less than or equal to 16MB.\n",
1225 pmclog_buffer_size);
1226 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1229 if (pmc_nlogbuffers_pcpu <= 0) {
1230 (void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
1231 "than zero.\n", pmc_nlogbuffers_pcpu);
1232 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1234 if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) {
1235 (void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n",
1236 pmc_nlogbuffers_pcpu*pmclog_buffer_size);
1237 pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
1238 pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
1240 for (domain = 0; domain < NDOMAINS; domain++) {
1241 int ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus;
1242 int total = ncpus*pmc_nlogbuffers_pcpu;
1244 plb = malloc_domain(sizeof(struct pmclog_buffer)*total, M_PMC, domain, M_WAITOK|M_ZERO);
1245 pmc_dom_hdrs[domain]->pdbh_plbs = plb;
1246 for (int i = 0; i < total; i++, plb++) {
1249 buf = malloc_domain(1024 * pmclog_buffer_size, M_PMC, domain,
1251 PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain);
1252 pmc_plb_rele_unlocked(plb);
1255 mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
1261 * Destroy mutexes and release memory back the to free pool.
1267 struct pmclog_buffer *plb;
1270 mtx_destroy(&pmc_kthread_mtx);
1272 for (domain = 0; domain < NDOMAINS; domain++) {
1273 while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) {
1274 TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
1275 free(plb->plb_base, M_PMC);
1277 free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC);