/* $OpenBSD: subr_prof.c,v 1.6 1996/05/02 13:12:22 deraadt Exp $ */ /* $NetBSD: subr_prof.c,v 1.12 1996/04/22 01:38:50 christos Exp $ */ /*- * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)subr_prof.c 8.3 (Berkeley) 9/23/93 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/user.h> #include <sys/mount.h> #include <sys/syscallargs.h> #include <machine/cpu.h> #ifdef GPROF #include <sys/malloc.h> #include <sys/gmon.h> /* * Froms is actually a bunch of unsigned shorts indexing tos */ struct gmonparam _gmonparam = { GMON_PROF_OFF }; extern char etext[]; void kmstartup() { char *cp; struct gmonparam *p = &_gmonparam; /* * Round lowpc and highpc to multiples of the density we're using * so the rest of the scaling (here and in gprof) stays in ints. */ p->lowpc = ROUNDDOWN(KERNBASE, HISTFRACTION * sizeof(HISTCOUNTER)); p->highpc = ROUNDUP((u_long)etext, HISTFRACTION * sizeof(HISTCOUNTER)); p->textsize = p->highpc - p->lowpc; printf("Profiling kernel, textsize=%ld [%lx..%lx]\n", p->textsize, p->lowpc, p->highpc); p->kcountsize = p->textsize / HISTFRACTION; p->hashfraction = HASHFRACTION; p->fromssize = p->textsize / HASHFRACTION; p->tolimit = p->textsize * ARCDENSITY / 100; if (p->tolimit < MINARCS) p->tolimit = MINARCS; else if (p->tolimit > MAXARCS) p->tolimit = MAXARCS; p->tossize = p->tolimit * sizeof(struct tostruct); cp = (char *)malloc(p->kcountsize + p->fromssize + p->tossize, M_GPROF, M_NOWAIT); if (cp == 0) { printf("No memory for profiling.\n"); return; } bzero(cp, p->kcountsize + p->tossize + p->fromssize); p->tos = (struct tostruct *)cp; cp += p->tossize; p->kcount = (u_short *)cp; cp += p->kcountsize; p->froms = (u_short *)cp; } /* * Return kernel profiling information. */ int sysctl_doprof(name, namelen, oldp, oldlenp, newp, newlen) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; { struct gmonparam *gp = &_gmonparam; int error; /* all sysctl names at this level are terminal */ if (namelen != 1) return (ENOTDIR); /* overloaded */ switch (name[0]) { case GPROF_STATE: error = sysctl_int(oldp, oldlenp, newp, newlen, &gp->state); if (error) return (error); if (gp->state == GMON_PROF_OFF) stopprofclock(&proc0); else startprofclock(&proc0); return (0); case GPROF_COUNT: return (sysctl_struct(oldp, oldlenp, newp, newlen, gp->kcount, gp->kcountsize)); case GPROF_FROMS: return (sysctl_struct(oldp, oldlenp, newp, newlen, gp->froms, gp->fromssize)); case GPROF_TOS: return (sysctl_struct(oldp, oldlenp, newp, newlen, gp->tos, gp->tossize)); case GPROF_GMONPARAM: return (sysctl_rdstruct(oldp, oldlenp, newp, gp, sizeof *gp)); default: return (EOPNOTSUPP); } /* NOTREACHED */ } #endif /* GPROF */ /* * Profiling system call. * * The scale factor is a fixed point number with 16 bits of fraction, so that * 1.0 is represented as 0x10000. A scale factor of 0 turns off profiling. */ /* ARGSUSED */ int sys_profil(p, v, retval) struct proc *p; void *v; register_t *retval; { register struct sys_profil_args /* { syscallarg(char *) samples; syscallarg(u_int) size; syscallarg(u_int) offset; syscallarg(u_int) scale; } */ *uap = v; register struct uprof *upp; int s; if (SCARG(uap, scale) > (1 << 16)) return (EINVAL); if (SCARG(uap, scale) == 0) { stopprofclock(p); return (0); } upp = &p->p_stats->p_prof; /* Block profile interrupts while changing state. */ s = splstatclock(); upp->pr_off = SCARG(uap, offset); upp->pr_scale = SCARG(uap, scale); upp->pr_base = (caddr_t)SCARG(uap, samples); upp->pr_size = SCARG(uap, size); startprofclock(p); splx(s); return (0); } /* * Scale is a fixed-point number with the binary point 16 bits * into the value, and is <= 1.0. pc is at most 32 bits, so the * intermediate result is at most 48 bits. */ #define PC_TO_INDEX(pc, prof) \ ((int)(((u_quad_t)((pc) - (prof)->pr_off) * \ (u_quad_t)((prof)->pr_scale)) >> 16) & ~1) /* * Collect user-level profiling statistics; called on a profiling tick, * when a process is running in user-mode. This routine may be called * from an interrupt context. We try to update the user profiling buffers * cheaply with fuswintr() and suswintr(). If that fails, we revert to * an AST that will vector us to trap() with a context in which copyin * and copyout will work. Trap will then call addupc_task(). * * Note that we may (rarely) not get around to the AST soon enough, and * lose profile ticks when the next tick overwrites this one, but in this * case the system is overloaded and the profile is probably already * inaccurate. */ void addupc_intr(p, pc, ticks) register struct proc *p; register u_long pc; u_int ticks; { register struct uprof *prof; register caddr_t addr; register u_int i; register int v; if (ticks == 0) return; prof = &p->p_stats->p_prof; if (pc < prof->pr_off || (i = PC_TO_INDEX(pc, prof)) >= prof->pr_size) return; /* out of range; ignore */ addr = prof->pr_base + i; if ((v = fuswintr(addr)) == -1 || suswintr(addr, v + ticks) == -1) { prof->pr_addr = pc; prof->pr_ticks = ticks; need_proftick(p); } } /* * Much like before, but we can afford to take faults here. If the * update fails, we simply turn off profiling. */ void addupc_task(p, pc, ticks) register struct proc *p; register u_long pc; u_int ticks; { register struct uprof *prof; register caddr_t addr; register u_int i; u_short v; /* Testing P_PROFIL may be unnecessary, but is certainly safe. */ if ((p->p_flag & P_PROFIL) == 0 || ticks == 0) return; prof = &p->p_stats->p_prof; if (pc < prof->pr_off || (i = PC_TO_INDEX(pc, prof)) >= prof->pr_size) return; addr = prof->pr_base + i; if (copyin(addr, (caddr_t)&v, sizeof(v)) == 0) { v += ticks; if (copyout((caddr_t)&v, addr, sizeof(v)) == 0) return; } stopprofclock(p); }