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author | rgrimes <rgrimes@FreeBSD.org> | 1994-05-24 10:09:53 +0000 |
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committer | rgrimes <rgrimes@FreeBSD.org> | 1994-05-24 10:09:53 +0000 |
commit | 8fb65ce818b3e3c6f165b583b910af24000768a5 (patch) | |
tree | ba751e4f2166aefec707c9d7401c7ff432506642 /sys/kern/subr_prof.c | |
parent | a6ce65d368e623088a4c1a29865889f431b15420 (diff) | |
download | FreeBSD-src-8fb65ce818b3e3c6f165b583b910af24000768a5.zip FreeBSD-src-8fb65ce818b3e3c6f165b583b910af24000768a5.tar.gz |
BSD 4.4 Lite Kernel Sources
Diffstat (limited to 'sys/kern/subr_prof.c')
-rw-r--r-- | sys/kern/subr_prof.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/sys/kern/subr_prof.c b/sys/kern/subr_prof.c new file mode 100644 index 0000000..4fb81d8 --- /dev/null +++ b/sys/kern/subr_prof.c @@ -0,0 +1,256 @@ +/*- + * 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 <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[]; + +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=%d [%x..%x]\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. + */ +sysctl_doprof(name, namelen, oldp, oldlenp, newp, newlen, p) + 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. + */ +struct profil_args { + caddr_t samples; + u_int size; + u_int offset; + u_int scale; +}; +/* ARGSUSED */ +profil(p, uap, retval) + struct proc *p; + register struct profil_args *uap; + int *retval; +{ + register struct uprof *upp; + int s; + + if (uap->scale > (1 << 16)) + return (EINVAL); + if (uap->scale == 0) { + stopprofclock(p); + return (0); + } + upp = &p->p_stats->p_prof; + + /* Block profile interrupts while changing state. */ + s = splstatclock(); + upp->pr_off = uap->offset; + upp->pr_scale = uap->scale; + upp->pr_base = uap->samples; + upp->pr_size = 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); +} |