subr_prof.c revision 30309
11541Srgrimes/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)subr_prof.c 8.3 (Berkeley) 9/23/93 3430309Sphk * $Id: subr_prof.c,v 1.20 1997/02/22 09:39:17 peter Exp $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes#include <sys/param.h> 381541Srgrimes#include <sys/systm.h> 3912221Sbde#include <sys/sysproto.h> 401541Srgrimes#include <sys/kernel.h> 411541Srgrimes#include <sys/proc.h> 4212657Sbde#include <sys/resourcevar.h> 437090Sbde#include <sys/sysctl.h> 447090Sbde 451541Srgrimes#include <machine/cpu.h> 461541Srgrimes 471541Srgrimes#ifdef GPROF 481541Srgrimes#include <sys/malloc.h> 491541Srgrimes#include <sys/gmon.h> 501541Srgrimes 5130309SphkMALLOC_DEFINE(M_GPROF, "gprof", "kernel profiling buffer"); 5230309Sphk 5310653Sdgstatic void kmstartup __P((void *)); 5410358SjulianSYSINIT(kmem, SI_SUB_KPROF, SI_ORDER_FIRST, kmstartup, NULL) 5510358Sjulian 561541Srgrimesstruct gmonparam _gmonparam = { GMON_PROF_OFF }; 571541Srgrimes 586009Sbdeextern char btext[]; 591541Srgrimesextern char etext[]; 601541Srgrimes 6119000Sbde#ifdef GUPROF 6219000Sbdevoid 6319000Sbdenullfunc_loop_profiled() 6419000Sbde{ 6519000Sbde int i; 6619000Sbde 6719000Sbde for (i = 0; i < CALIB_SCALE; i++) 6819000Sbde nullfunc_profiled(); 6919000Sbde} 7019000Sbde 7120396Sbde#define nullfunc_loop_profiled_end nullfunc_profiled /* XXX */ 7220396Sbde 7319000Sbdevoid 7419000Sbdenullfunc_profiled() 7519000Sbde{ 7619000Sbde} 7719000Sbde#endif /* GUPROF */ 7819000Sbde 7910407Sbdestatic void 8012569Sbdekmstartup(dummy) 8112569Sbde void *dummy; 821541Srgrimes{ 831541Srgrimes char *cp; 841541Srgrimes struct gmonparam *p = &_gmonparam; 8513107Sbde#ifdef GUPROF 8619000Sbde int cputime_overhead; 8719000Sbde int empty_loop_time; 8819000Sbde int i; 8919000Sbde int mcount_overhead; 9019000Sbde int mexitcount_overhead; 9119000Sbde int nullfunc_loop_overhead; 9219000Sbde int nullfunc_loop_profiled_time; 9320396Sbde fptrint_t tmp_addr; 9413107Sbde#endif 9513107Sbde 961541Srgrimes /* 971541Srgrimes * Round lowpc and highpc to multiples of the density we're using 981541Srgrimes * so the rest of the scaling (here and in gprof) stays in ints. 991541Srgrimes */ 1006009Sbde p->lowpc = ROUNDDOWN((u_long)btext, HISTFRACTION * sizeof(HISTCOUNTER)); 1011541Srgrimes p->highpc = ROUNDUP((u_long)etext, HISTFRACTION * sizeof(HISTCOUNTER)); 1021541Srgrimes p->textsize = p->highpc - p->lowpc; 10319000Sbde printf("Profiling kernel, textsize=%lu [%x..%x]\n", 1041541Srgrimes p->textsize, p->lowpc, p->highpc); 1051541Srgrimes p->kcountsize = p->textsize / HISTFRACTION; 1061541Srgrimes p->hashfraction = HASHFRACTION; 1071541Srgrimes p->fromssize = p->textsize / HASHFRACTION; 1081541Srgrimes p->tolimit = p->textsize * ARCDENSITY / 100; 1091541Srgrimes if (p->tolimit < MINARCS) 1101541Srgrimes p->tolimit = MINARCS; 1111541Srgrimes else if (p->tolimit > MAXARCS) 1121541Srgrimes p->tolimit = MAXARCS; 1131541Srgrimes p->tossize = p->tolimit * sizeof(struct tostruct); 1141541Srgrimes cp = (char *)malloc(p->kcountsize + p->fromssize + p->tossize, 1151541Srgrimes M_GPROF, M_NOWAIT); 1161541Srgrimes if (cp == 0) { 1171541Srgrimes printf("No memory for profiling.\n"); 1181541Srgrimes return; 1191541Srgrimes } 1201541Srgrimes bzero(cp, p->kcountsize + p->tossize + p->fromssize); 1211541Srgrimes p->tos = (struct tostruct *)cp; 1221541Srgrimes cp += p->tossize; 12313107Sbde p->kcount = (HISTCOUNTER *)cp; 1241541Srgrimes cp += p->kcountsize; 1251541Srgrimes p->froms = (u_short *)cp; 12613107Sbde 12713107Sbde#ifdef GUPROF 12819000Sbde /* Initialize pointers to overhead counters. */ 12913107Sbde p->cputime_count = &KCOUNT(p, PC_TO_I(p, cputime)); 13013107Sbde p->mcount_count = &KCOUNT(p, PC_TO_I(p, mcount)); 13113107Sbde p->mexitcount_count = &KCOUNT(p, PC_TO_I(p, mexitcount)); 13213107Sbde 13313107Sbde /* 13419000Sbde * Disable interrupts to avoid interference while we calibrate 13519000Sbde * things. 13613107Sbde */ 13713107Sbde disable_intr(); 13813107Sbde 13919000Sbde /* 14019000Sbde * Determine overheads. 14119000Sbde * XXX this needs to be repeated for each useful timer/counter. 14219000Sbde */ 14319000Sbde cputime_overhead = 0; 14419000Sbde startguprof(p); 14513107Sbde for (i = 0; i < CALIB_SCALE; i++) 14619000Sbde cputime_overhead += cputime(); 14713107Sbde 14819000Sbde empty_loop(); 14919000Sbde startguprof(p); 15019000Sbde empty_loop(); 15119000Sbde empty_loop_time = cputime(); 15219000Sbde 15319000Sbde nullfunc_loop_profiled(); 15419000Sbde 15519000Sbde /* 15619000Sbde * Start profiling. There won't be any normal function calls since 15719000Sbde * interrupts are disabled, but we will call the profiling routines 15819000Sbde * directly to determine their overheads. 15919000Sbde */ 16019000Sbde p->state = GMON_PROF_HIRES; 16119000Sbde 16219000Sbde startguprof(p); 16319000Sbde nullfunc_loop_profiled(); 16419000Sbde 16519000Sbde startguprof(p); 16613107Sbde for (i = 0; i < CALIB_SCALE; i++) 16713107Sbde#if defined(i386) && __GNUC__ >= 2 16813107Sbde asm("pushl %0; call __mcount; popl %%ecx" 16913107Sbde : 17019000Sbde : "i" (profil) 17113107Sbde : "ax", "bx", "cx", "dx", "memory"); 17213107Sbde#else 17313107Sbde#error 17413107Sbde#endif 17519000Sbde mcount_overhead = KCOUNT(p, PC_TO_I(p, profil)); 17613107Sbde 17719000Sbde startguprof(p); 17813107Sbde for (i = 0; i < CALIB_SCALE; i++) 17913107Sbde#if defined(i386) && __GNUC__ >= 2 18013107Sbde asm("call mexitcount; 1:" 18113107Sbde : : : "ax", "bx", "cx", "dx", "memory"); 18220396Sbde asm("movl $1b,%0" : "=rm" (tmp_addr)); 18313107Sbde#else 18413107Sbde#error 18513107Sbde#endif 18620396Sbde mexitcount_overhead = KCOUNT(p, PC_TO_I(p, tmp_addr)); 18713107Sbde 18813107Sbde p->state = GMON_PROF_OFF; 18919000Sbde stopguprof(p); 19019000Sbde 19113107Sbde enable_intr(); 19213107Sbde 19319000Sbde nullfunc_loop_profiled_time = 0; 19420396Sbde for (tmp_addr = (fptrint_t)nullfunc_loop_profiled; 19520396Sbde tmp_addr < (fptrint_t)nullfunc_loop_profiled_end; 19620396Sbde tmp_addr += HISTFRACTION * sizeof(HISTCOUNTER)) 19720396Sbde nullfunc_loop_profiled_time += KCOUNT(p, PC_TO_I(p, tmp_addr)); 19819000Sbde#define CALIB_DOSCALE(count) (((count) + CALIB_SCALE / 3) / CALIB_SCALE) 19919000Sbde#define c2n(count, freq) ((int)((count) * 1000000000LL / freq)) 20019000Sbde printf("cputime %d, empty_loop %d, nullfunc_loop_profiled %d, mcount %d, mexitcount %d\n", 20119000Sbde CALIB_DOSCALE(c2n(cputime_overhead, p->profrate)), 20219000Sbde CALIB_DOSCALE(c2n(empty_loop_time, p->profrate)), 20319000Sbde CALIB_DOSCALE(c2n(nullfunc_loop_profiled_time, p->profrate)), 20419000Sbde CALIB_DOSCALE(c2n(mcount_overhead, p->profrate)), 20519000Sbde CALIB_DOSCALE(c2n(mexitcount_overhead, p->profrate))); 20619000Sbde cputime_overhead -= empty_loop_time; 20719000Sbde mcount_overhead -= empty_loop_time; 20819000Sbde mexitcount_overhead -= empty_loop_time; 20919000Sbde 21019000Sbde /*- 21119000Sbde * Profiling overheads are determined by the times between the 21219000Sbde * following events: 21319000Sbde * MC1: mcount() is called 21419000Sbde * MC2: cputime() (called from mcount()) latches the timer 21519000Sbde * MC3: mcount() completes 21619000Sbde * ME1: mexitcount() is called 21719000Sbde * ME2: cputime() (called from mexitcount()) latches the timer 21819000Sbde * ME3: mexitcount() completes. 21919000Sbde * The times between the events vary slightly depending on instruction 22019000Sbde * combination and cache misses, etc. Attempt to determine the 22119000Sbde * minimum times. These can be subtracted from the profiling times 22219000Sbde * without much risk of reducing the profiling times below what they 22319000Sbde * would be when profiling is not configured. Abbreviate: 22419000Sbde * ab = minimum time between MC1 and MC3 22519000Sbde * a = minumum time between MC1 and MC2 22619000Sbde * b = minimum time between MC2 and MC3 22719000Sbde * cd = minimum time between ME1 and ME3 22819000Sbde * c = minimum time between ME1 and ME2 22919000Sbde * d = minimum time between ME2 and ME3. 23019000Sbde * These satisfy the relations: 23119000Sbde * ab <= mcount_overhead (just measured) 23219000Sbde * a + b <= ab 23319000Sbde * cd <= mexitcount_overhead (just measured) 23419000Sbde * c + d <= cd 23519000Sbde * a + d <= nullfunc_loop_profiled_time (just measured) 23619000Sbde * a >= 0, b >= 0, c >= 0, d >= 0. 23719000Sbde * Assume that ab and cd are equal to the minimums. 23819000Sbde */ 23919000Sbde p->cputime_overhead = CALIB_DOSCALE(cputime_overhead); 24019000Sbde p->mcount_overhead = CALIB_DOSCALE(mcount_overhead - cputime_overhead); 24119000Sbde p->mexitcount_overhead = CALIB_DOSCALE(mexitcount_overhead 24219000Sbde - cputime_overhead); 24319000Sbde nullfunc_loop_overhead = nullfunc_loop_profiled_time - empty_loop_time; 24419000Sbde p->mexitcount_post_overhead = CALIB_DOSCALE((mcount_overhead 24519000Sbde - nullfunc_loop_overhead) 24619000Sbde / 4); 24719000Sbde p->mexitcount_pre_overhead = p->mexitcount_overhead 24819000Sbde + p->cputime_overhead 24919000Sbde - p->mexitcount_post_overhead; 25019000Sbde p->mcount_pre_overhead = CALIB_DOSCALE(nullfunc_loop_overhead) 25119000Sbde - p->mexitcount_post_overhead; 25219000Sbde p->mcount_post_overhead = p->mcount_overhead 25319000Sbde + p->cputime_overhead 25419000Sbde - p->mcount_pre_overhead; 25519000Sbde printf( 25619000Sbde"Profiling overheads: mcount: %d+%d, %d+%d; mexitcount: %d+%d, %d+%d nsec\n", 25719000Sbde c2n(p->cputime_overhead, p->profrate), 25819000Sbde c2n(p->mcount_overhead, p->profrate), 25919000Sbde c2n(p->mcount_pre_overhead, p->profrate), 26019000Sbde c2n(p->mcount_post_overhead, p->profrate), 26119000Sbde c2n(p->cputime_overhead, p->profrate), 26219000Sbde c2n(p->mexitcount_overhead, p->profrate), 26319000Sbde c2n(p->mexitcount_pre_overhead, p->profrate), 26419000Sbde c2n(p->mexitcount_post_overhead, p->profrate)); 26519000Sbde printf( 26619000Sbde"Profiling overheads: mcount: %d+%d, %d+%d; mexitcount: %d+%d, %d+%d cycles\n", 26719000Sbde p->cputime_overhead, p->mcount_overhead, 26819000Sbde p->mcount_pre_overhead, p->mcount_post_overhead, 26919000Sbde p->cputime_overhead, p->mexitcount_overhead, 27019000Sbde p->mexitcount_pre_overhead, p->mexitcount_post_overhead); 27113107Sbde#endif /* GUPROF */ 2721541Srgrimes} 2731541Srgrimes 2741541Srgrimes/* 2751541Srgrimes * Return kernel profiling information. 2761541Srgrimes */ 27712429Sphkstatic int 27812429Sphksysctl_kern_prof SYSCTL_HANDLER_ARGS 2791541Srgrimes{ 28012429Sphk int *name = (int *) arg1; 28112429Sphk u_int namelen = arg2; 2821541Srgrimes struct gmonparam *gp = &_gmonparam; 2831541Srgrimes int error; 28413107Sbde int state; 2851541Srgrimes 2861541Srgrimes /* all sysctl names at this level are terminal */ 2871541Srgrimes if (namelen != 1) 2881541Srgrimes return (ENOTDIR); /* overloaded */ 2891541Srgrimes 2901541Srgrimes switch (name[0]) { 2911541Srgrimes case GPROF_STATE: 29213107Sbde state = gp->state; 29313107Sbde error = sysctl_handle_int(oidp, &state, 0, req); 2941541Srgrimes if (error) 2951541Srgrimes return (error); 29613107Sbde if (!req->newptr) 29713107Sbde return (0); 29813107Sbde if (state == GMON_PROF_OFF) { 29919000Sbde gp->state = state; 3001541Srgrimes stopprofclock(&proc0); 30119000Sbde stopguprof(gp); 30213107Sbde } else if (state == GMON_PROF_ON) { 30319000Sbde gp->state = GMON_PROF_OFF; 30419000Sbde stopguprof(gp); 30513107Sbde gp->profrate = profhz; 30619000Sbde startprofclock(&proc0); 30713107Sbde gp->state = state; 30813107Sbde#ifdef GUPROF 30913107Sbde } else if (state == GMON_PROF_HIRES) { 31019000Sbde gp->state = GMON_PROF_OFF; 31113107Sbde stopprofclock(&proc0); 31219000Sbde startguprof(gp); 31313107Sbde gp->state = state; 31413107Sbde#endif 31513107Sbde } else if (state != gp->state) 31613107Sbde return (EINVAL); 3171541Srgrimes return (0); 3181541Srgrimes case GPROF_COUNT: 31912429Sphk return (sysctl_handle_opaque(oidp, 32012429Sphk gp->kcount, gp->kcountsize, req)); 3211541Srgrimes case GPROF_FROMS: 32212429Sphk return (sysctl_handle_opaque(oidp, 32312429Sphk gp->froms, gp->fromssize, req)); 3241541Srgrimes case GPROF_TOS: 32512429Sphk return (sysctl_handle_opaque(oidp, 32612429Sphk gp->tos, gp->tossize, req)); 3271541Srgrimes case GPROF_GMONPARAM: 32812429Sphk return (sysctl_handle_opaque(oidp, gp, sizeof *gp, req)); 3291541Srgrimes default: 3301541Srgrimes return (EOPNOTSUPP); 3311541Srgrimes } 3321541Srgrimes /* NOTREACHED */ 3331541Srgrimes} 33412429Sphk 33512429SphkSYSCTL_NODE(_kern, KERN_PROF, prof, CTLFLAG_RW, sysctl_kern_prof, ""); 3361541Srgrimes#endif /* GPROF */ 3371541Srgrimes 3381541Srgrimes/* 3391541Srgrimes * Profiling system call. 3401541Srgrimes * 3411541Srgrimes * The scale factor is a fixed point number with 16 bits of fraction, so that 3421541Srgrimes * 1.0 is represented as 0x10000. A scale factor of 0 turns off profiling. 3431541Srgrimes */ 34412221Sbde#ifndef _SYS_SYSPROTO_H_ 3451541Srgrimesstruct profil_args { 3461541Srgrimes caddr_t samples; 3471541Srgrimes u_int size; 3481541Srgrimes u_int offset; 3491541Srgrimes u_int scale; 3501541Srgrimes}; 35112221Sbde#endif 3521541Srgrimes/* ARGSUSED */ 3531549Srgrimesint 3541541Srgrimesprofil(p, uap, retval) 3551541Srgrimes struct proc *p; 3561541Srgrimes register struct profil_args *uap; 3571541Srgrimes int *retval; 3581541Srgrimes{ 3591541Srgrimes register struct uprof *upp; 3601541Srgrimes int s; 3611541Srgrimes 3621541Srgrimes if (uap->scale > (1 << 16)) 3631541Srgrimes return (EINVAL); 3641541Srgrimes if (uap->scale == 0) { 3651541Srgrimes stopprofclock(p); 3661541Srgrimes return (0); 3671541Srgrimes } 3681541Srgrimes upp = &p->p_stats->p_prof; 3691541Srgrimes 3701541Srgrimes /* Block profile interrupts while changing state. */ 3711541Srgrimes s = splstatclock(); 3721541Srgrimes upp->pr_off = uap->offset; 3731541Srgrimes upp->pr_scale = uap->scale; 3741541Srgrimes upp->pr_base = uap->samples; 3751541Srgrimes upp->pr_size = uap->size; 3761541Srgrimes startprofclock(p); 3771541Srgrimes splx(s); 3781541Srgrimes 3791541Srgrimes return (0); 3801541Srgrimes} 3811541Srgrimes 3821541Srgrimes/* 3831541Srgrimes * Scale is a fixed-point number with the binary point 16 bits 3841541Srgrimes * into the value, and is <= 1.0. pc is at most 32 bits, so the 3851541Srgrimes * intermediate result is at most 48 bits. 3861541Srgrimes */ 3871541Srgrimes#define PC_TO_INDEX(pc, prof) \ 3881541Srgrimes ((int)(((u_quad_t)((pc) - (prof)->pr_off) * \ 3891541Srgrimes (u_quad_t)((prof)->pr_scale)) >> 16) & ~1) 3901541Srgrimes 3911541Srgrimes/* 3921541Srgrimes * Collect user-level profiling statistics; called on a profiling tick, 3931541Srgrimes * when a process is running in user-mode. This routine may be called 3941541Srgrimes * from an interrupt context. We try to update the user profiling buffers 3951541Srgrimes * cheaply with fuswintr() and suswintr(). If that fails, we revert to 3961541Srgrimes * an AST that will vector us to trap() with a context in which copyin 3971541Srgrimes * and copyout will work. Trap will then call addupc_task(). 3981541Srgrimes * 3991541Srgrimes * Note that we may (rarely) not get around to the AST soon enough, and 4001541Srgrimes * lose profile ticks when the next tick overwrites this one, but in this 4011541Srgrimes * case the system is overloaded and the profile is probably already 4021541Srgrimes * inaccurate. 4031541Srgrimes */ 4041541Srgrimesvoid 4051541Srgrimesaddupc_intr(p, pc, ticks) 4061541Srgrimes register struct proc *p; 4071541Srgrimes register u_long pc; 4081541Srgrimes u_int ticks; 4091541Srgrimes{ 4101541Srgrimes register struct uprof *prof; 4111541Srgrimes register caddr_t addr; 4121541Srgrimes register u_int i; 4131541Srgrimes register int v; 4141541Srgrimes 4151541Srgrimes if (ticks == 0) 4161541Srgrimes return; 4171541Srgrimes prof = &p->p_stats->p_prof; 4181541Srgrimes if (pc < prof->pr_off || 4191541Srgrimes (i = PC_TO_INDEX(pc, prof)) >= prof->pr_size) 4201541Srgrimes return; /* out of range; ignore */ 4211541Srgrimes 4221541Srgrimes addr = prof->pr_base + i; 4231541Srgrimes if ((v = fuswintr(addr)) == -1 || suswintr(addr, v + ticks) == -1) { 4241541Srgrimes prof->pr_addr = pc; 4251541Srgrimes prof->pr_ticks = ticks; 4261541Srgrimes need_proftick(p); 4271541Srgrimes } 4281541Srgrimes} 4291541Srgrimes 4301541Srgrimes/* 4311541Srgrimes * Much like before, but we can afford to take faults here. If the 4321541Srgrimes * update fails, we simply turn off profiling. 4331541Srgrimes */ 43413017Sbdevoid 4351541Srgrimesaddupc_task(p, pc, ticks) 4361541Srgrimes register struct proc *p; 4371541Srgrimes register u_long pc; 4381541Srgrimes u_int ticks; 4391541Srgrimes{ 4401541Srgrimes register struct uprof *prof; 4411541Srgrimes register caddr_t addr; 4421541Srgrimes register u_int i; 4431541Srgrimes u_short v; 4441541Srgrimes 4451541Srgrimes /* Testing P_PROFIL may be unnecessary, but is certainly safe. */ 4461541Srgrimes if ((p->p_flag & P_PROFIL) == 0 || ticks == 0) 4471541Srgrimes return; 4481541Srgrimes 4491541Srgrimes prof = &p->p_stats->p_prof; 4501541Srgrimes if (pc < prof->pr_off || 4511541Srgrimes (i = PC_TO_INDEX(pc, prof)) >= prof->pr_size) 4521541Srgrimes return; 4531541Srgrimes 4541541Srgrimes addr = prof->pr_base + i; 4551541Srgrimes if (copyin(addr, (caddr_t)&v, sizeof(v)) == 0) { 4561541Srgrimes v += ticks; 4571541Srgrimes if (copyout((caddr_t)&v, addr, sizeof(v)) == 0) 4581541Srgrimes return; 4591541Srgrimes } 4601541Srgrimes stopprofclock(p); 4611541Srgrimes} 462