266 lines
7.5 KiB
C
266 lines
7.5 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)subr_prof.c 8.3 (Berkeley) 9/23/93
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* $Id: subr_prof.c,v 1.8 1995/08/29 03:09:05 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <sys/sysctl.h>
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#include <sys/user.h>
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#include <machine/cpu.h>
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#ifdef GPROF
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#include <sys/malloc.h>
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#include <sys/gmon.h>
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static void kmstartup __P((void *));
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SYSINIT(kmem, SI_SUB_KPROF, SI_ORDER_FIRST, kmstartup, NULL)
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struct gmonparam _gmonparam = { GMON_PROF_OFF };
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extern char btext[];
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extern char etext[];
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static void
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kmstartup(udata)
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void *udata;
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{
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char *cp;
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struct gmonparam *p = &_gmonparam;
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/*
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* Round lowpc and highpc to multiples of the density we're using
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* so the rest of the scaling (here and in gprof) stays in ints.
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*/
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p->lowpc = ROUNDDOWN((u_long)btext, HISTFRACTION * sizeof(HISTCOUNTER));
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p->highpc = ROUNDUP((u_long)etext, HISTFRACTION * sizeof(HISTCOUNTER));
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p->textsize = p->highpc - p->lowpc;
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printf("Profiling kernel, textsize=%d [%x..%x]\n",
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p->textsize, p->lowpc, p->highpc);
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p->kcountsize = p->textsize / HISTFRACTION;
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p->hashfraction = HASHFRACTION;
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p->fromssize = p->textsize / HASHFRACTION;
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p->tolimit = p->textsize * ARCDENSITY / 100;
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if (p->tolimit < MINARCS)
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p->tolimit = MINARCS;
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else if (p->tolimit > MAXARCS)
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p->tolimit = MAXARCS;
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p->tossize = p->tolimit * sizeof(struct tostruct);
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cp = (char *)malloc(p->kcountsize + p->fromssize + p->tossize,
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M_GPROF, M_NOWAIT);
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if (cp == 0) {
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printf("No memory for profiling.\n");
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return;
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}
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bzero(cp, p->kcountsize + p->tossize + p->fromssize);
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p->tos = (struct tostruct *)cp;
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cp += p->tossize;
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p->kcount = (u_short *)cp;
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cp += p->kcountsize;
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p->froms = (u_short *)cp;
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}
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/*
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* Return kernel profiling information.
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*/
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int
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sysctl_doprof(name, namelen, oldp, oldlenp, newp, newlen)
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int *name;
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u_int namelen;
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void *oldp;
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size_t *oldlenp;
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void *newp;
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size_t newlen;
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{
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struct gmonparam *gp = &_gmonparam;
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int error;
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/* all sysctl names at this level are terminal */
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if (namelen != 1)
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return (ENOTDIR); /* overloaded */
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switch (name[0]) {
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case GPROF_STATE:
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error = sysctl_int(oldp, oldlenp, newp, newlen, &gp->state);
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if (error)
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return (error);
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if (gp->state == GMON_PROF_OFF)
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stopprofclock(&proc0);
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else
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startprofclock(&proc0);
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return (0);
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case GPROF_COUNT:
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return (sysctl_struct(oldp, oldlenp, newp, newlen,
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gp->kcount, gp->kcountsize));
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case GPROF_FROMS:
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return (sysctl_struct(oldp, oldlenp, newp, newlen,
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gp->froms, gp->fromssize));
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case GPROF_TOS:
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return (sysctl_struct(oldp, oldlenp, newp, newlen,
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gp->tos, gp->tossize));
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case GPROF_GMONPARAM:
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return (sysctl_rdstruct(oldp, oldlenp, newp, gp, sizeof *gp));
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default:
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return (EOPNOTSUPP);
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}
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/* NOTREACHED */
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}
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#endif /* GPROF */
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/*
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* Profiling system call.
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*
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* The scale factor is a fixed point number with 16 bits of fraction, so that
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* 1.0 is represented as 0x10000. A scale factor of 0 turns off profiling.
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*/
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struct profil_args {
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caddr_t samples;
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u_int size;
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u_int offset;
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u_int scale;
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};
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/* ARGSUSED */
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int
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profil(p, uap, retval)
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struct proc *p;
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register struct profil_args *uap;
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int *retval;
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{
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register struct uprof *upp;
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int s;
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if (uap->scale > (1 << 16))
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return (EINVAL);
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if (uap->scale == 0) {
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stopprofclock(p);
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return (0);
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}
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upp = &p->p_stats->p_prof;
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/* Block profile interrupts while changing state. */
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s = splstatclock();
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upp->pr_off = uap->offset;
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upp->pr_scale = uap->scale;
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upp->pr_base = uap->samples;
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upp->pr_size = uap->size;
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startprofclock(p);
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splx(s);
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return (0);
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}
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/*
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* Scale is a fixed-point number with the binary point 16 bits
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* into the value, and is <= 1.0. pc is at most 32 bits, so the
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* intermediate result is at most 48 bits.
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*/
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#define PC_TO_INDEX(pc, prof) \
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((int)(((u_quad_t)((pc) - (prof)->pr_off) * \
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(u_quad_t)((prof)->pr_scale)) >> 16) & ~1)
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/*
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* Collect user-level profiling statistics; called on a profiling tick,
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* when a process is running in user-mode. This routine may be called
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* from an interrupt context. We try to update the user profiling buffers
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* cheaply with fuswintr() and suswintr(). If that fails, we revert to
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* an AST that will vector us to trap() with a context in which copyin
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* and copyout will work. Trap will then call addupc_task().
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*
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* Note that we may (rarely) not get around to the AST soon enough, and
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* lose profile ticks when the next tick overwrites this one, but in this
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* case the system is overloaded and the profile is probably already
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* inaccurate.
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*/
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void
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addupc_intr(p, pc, ticks)
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register struct proc *p;
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register u_long pc;
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u_int ticks;
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{
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register struct uprof *prof;
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register caddr_t addr;
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register u_int i;
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register int v;
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if (ticks == 0)
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return;
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prof = &p->p_stats->p_prof;
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if (pc < prof->pr_off ||
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(i = PC_TO_INDEX(pc, prof)) >= prof->pr_size)
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return; /* out of range; ignore */
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addr = prof->pr_base + i;
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if ((v = fuswintr(addr)) == -1 || suswintr(addr, v + ticks) == -1) {
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prof->pr_addr = pc;
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prof->pr_ticks = ticks;
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need_proftick(p);
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}
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}
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/*
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* Much like before, but we can afford to take faults here. If the
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* update fails, we simply turn off profiling.
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*/
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void
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addupc_task(p, pc, ticks)
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register struct proc *p;
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register u_long pc;
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u_int ticks;
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{
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register struct uprof *prof;
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register caddr_t addr;
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register u_int i;
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u_short v;
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/* Testing P_PROFIL may be unnecessary, but is certainly safe. */
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if ((p->p_flag & P_PROFIL) == 0 || ticks == 0)
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return;
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prof = &p->p_stats->p_prof;
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if (pc < prof->pr_off ||
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(i = PC_TO_INDEX(pc, prof)) >= prof->pr_size)
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return;
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addr = prof->pr_base + i;
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if (copyin(addr, (caddr_t)&v, sizeof(v)) == 0) {
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v += ticks;
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if (copyout((caddr_t)&v, addr, sizeof(v)) == 0)
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return;
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}
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stopprofclock(p);
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}
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