458 lines
14 KiB
C
458 lines
14 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 1.25 1998/04/15 17:46:23 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/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sysctl.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 MALLOC_DEFINE(M_GPROF, "gprof", "kernel profiling buffer");
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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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#ifdef GUPROF
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void
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nullfunc_loop_profiled()
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{
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int i;
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for (i = 0; i < CALIB_SCALE; i++)
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nullfunc_profiled();
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}
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#define nullfunc_loop_profiled_end nullfunc_profiled /* XXX */
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void
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nullfunc_profiled()
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{
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}
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#endif /* GUPROF */
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static void
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kmstartup(dummy)
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void *dummy;
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{
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char *cp;
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struct gmonparam *p = &_gmonparam;
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#ifdef GUPROF
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int cputime_overhead;
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int empty_loop_time;
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int i;
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int mcount_overhead;
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int mexitcount_overhead;
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int nullfunc_loop_overhead;
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int nullfunc_loop_profiled_time;
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fptrint_t tmp_addr;
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#endif
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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=%lu [%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 = (HISTCOUNTER *)cp;
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cp += p->kcountsize;
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p->froms = (u_short *)cp;
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#ifdef GUPROF
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/* Initialize pointers to overhead counters. */
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p->cputime_count = &KCOUNT(p, PC_TO_I(p, cputime));
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p->mcount_count = &KCOUNT(p, PC_TO_I(p, mcount));
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p->mexitcount_count = &KCOUNT(p, PC_TO_I(p, mexitcount));
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/*
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* Disable interrupts to avoid interference while we calibrate
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* things.
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*/
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disable_intr();
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/*
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* Determine overheads.
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* XXX this needs to be repeated for each useful timer/counter.
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*/
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cputime_overhead = 0;
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startguprof(p);
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for (i = 0; i < CALIB_SCALE; i++)
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cputime_overhead += cputime();
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empty_loop();
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startguprof(p);
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empty_loop();
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empty_loop_time = cputime();
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nullfunc_loop_profiled();
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/*
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* Start profiling. There won't be any normal function calls since
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* interrupts are disabled, but we will call the profiling routines
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* directly to determine their overheads.
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*/
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p->state = GMON_PROF_HIRES;
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startguprof(p);
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nullfunc_loop_profiled();
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startguprof(p);
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for (i = 0; i < CALIB_SCALE; i++)
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#if defined(__i386__) && __GNUC__ >= 2
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__asm("pushl %0; call __mcount; popl %%ecx"
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:
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: "i" (profil)
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: "ax", "bx", "cx", "dx", "memory");
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#else
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#error
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#endif
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mcount_overhead = KCOUNT(p, PC_TO_I(p, profil));
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startguprof(p);
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for (i = 0; i < CALIB_SCALE; i++)
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#if defined(__i386__) && __GNUC__ >= 2
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__asm("call mexitcount; 1:"
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: : : "ax", "bx", "cx", "dx", "memory");
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__asm("movl $1b,%0" : "=rm" (tmp_addr));
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#else
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#error
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#endif
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mexitcount_overhead = KCOUNT(p, PC_TO_I(p, tmp_addr));
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p->state = GMON_PROF_OFF;
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stopguprof(p);
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enable_intr();
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nullfunc_loop_profiled_time = 0;
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for (tmp_addr = (fptrint_t)nullfunc_loop_profiled;
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tmp_addr < (fptrint_t)nullfunc_loop_profiled_end;
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tmp_addr += HISTFRACTION * sizeof(HISTCOUNTER))
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nullfunc_loop_profiled_time += KCOUNT(p, PC_TO_I(p, tmp_addr));
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#define CALIB_DOSCALE(count) (((count) + CALIB_SCALE / 3) / CALIB_SCALE)
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#define c2n(count, freq) ((int)((count) * 1000000000LL / freq))
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printf("cputime %d, empty_loop %d, nullfunc_loop_profiled %d, mcount %d, mexitcount %d\n",
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CALIB_DOSCALE(c2n(cputime_overhead, p->profrate)),
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CALIB_DOSCALE(c2n(empty_loop_time, p->profrate)),
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CALIB_DOSCALE(c2n(nullfunc_loop_profiled_time, p->profrate)),
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CALIB_DOSCALE(c2n(mcount_overhead, p->profrate)),
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CALIB_DOSCALE(c2n(mexitcount_overhead, p->profrate)));
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cputime_overhead -= empty_loop_time;
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mcount_overhead -= empty_loop_time;
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mexitcount_overhead -= empty_loop_time;
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/*-
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* Profiling overheads are determined by the times between the
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* following events:
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* MC1: mcount() is called
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* MC2: cputime() (called from mcount()) latches the timer
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* MC3: mcount() completes
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* ME1: mexitcount() is called
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* ME2: cputime() (called from mexitcount()) latches the timer
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* ME3: mexitcount() completes.
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* The times between the events vary slightly depending on instruction
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* combination and cache misses, etc. Attempt to determine the
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* minimum times. These can be subtracted from the profiling times
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* without much risk of reducing the profiling times below what they
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* would be when profiling is not configured. Abbreviate:
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* ab = minimum time between MC1 and MC3
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* a = minumum time between MC1 and MC2
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* b = minimum time between MC2 and MC3
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* cd = minimum time between ME1 and ME3
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* c = minimum time between ME1 and ME2
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* d = minimum time between ME2 and ME3.
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* These satisfy the relations:
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* ab <= mcount_overhead (just measured)
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* a + b <= ab
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* cd <= mexitcount_overhead (just measured)
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* c + d <= cd
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* a + d <= nullfunc_loop_profiled_time (just measured)
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* a >= 0, b >= 0, c >= 0, d >= 0.
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* Assume that ab and cd are equal to the minimums.
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*/
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p->cputime_overhead = CALIB_DOSCALE(cputime_overhead);
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p->mcount_overhead = CALIB_DOSCALE(mcount_overhead - cputime_overhead);
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p->mexitcount_overhead = CALIB_DOSCALE(mexitcount_overhead
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- cputime_overhead);
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nullfunc_loop_overhead = nullfunc_loop_profiled_time - empty_loop_time;
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p->mexitcount_post_overhead = CALIB_DOSCALE((mcount_overhead
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- nullfunc_loop_overhead)
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/ 4);
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p->mexitcount_pre_overhead = p->mexitcount_overhead
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+ p->cputime_overhead
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- p->mexitcount_post_overhead;
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p->mcount_pre_overhead = CALIB_DOSCALE(nullfunc_loop_overhead)
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- p->mexitcount_post_overhead;
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p->mcount_post_overhead = p->mcount_overhead
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+ p->cputime_overhead
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- p->mcount_pre_overhead;
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printf(
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"Profiling overheads: mcount: %d+%d, %d+%d; mexitcount: %d+%d, %d+%d nsec\n",
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c2n(p->cputime_overhead, p->profrate),
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c2n(p->mcount_overhead, p->profrate),
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c2n(p->mcount_pre_overhead, p->profrate),
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c2n(p->mcount_post_overhead, p->profrate),
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c2n(p->cputime_overhead, p->profrate),
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c2n(p->mexitcount_overhead, p->profrate),
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c2n(p->mexitcount_pre_overhead, p->profrate),
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c2n(p->mexitcount_post_overhead, p->profrate));
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printf(
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"Profiling overheads: mcount: %d+%d, %d+%d; mexitcount: %d+%d, %d+%d cycles\n",
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p->cputime_overhead, p->mcount_overhead,
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p->mcount_pre_overhead, p->mcount_post_overhead,
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p->cputime_overhead, p->mexitcount_overhead,
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p->mexitcount_pre_overhead, p->mexitcount_post_overhead);
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#endif /* GUPROF */
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}
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/*
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* Return kernel profiling information.
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*/
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static int
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sysctl_kern_prof SYSCTL_HANDLER_ARGS
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{
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int *name = (int *) arg1;
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u_int namelen = arg2;
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struct gmonparam *gp = &_gmonparam;
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int error;
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int state;
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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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state = gp->state;
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error = sysctl_handle_int(oidp, &state, 0, req);
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if (error)
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return (error);
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if (!req->newptr)
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return (0);
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if (state == GMON_PROF_OFF) {
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gp->state = state;
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stopprofclock(&proc0);
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stopguprof(gp);
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} else if (state == GMON_PROF_ON) {
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gp->state = GMON_PROF_OFF;
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stopguprof(gp);
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gp->profrate = profhz;
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startprofclock(&proc0);
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gp->state = state;
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#ifdef GUPROF
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} else if (state == GMON_PROF_HIRES) {
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gp->state = GMON_PROF_OFF;
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stopprofclock(&proc0);
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startguprof(gp);
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gp->state = state;
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#endif
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} else if (state != gp->state)
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return (EINVAL);
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return (0);
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case GPROF_COUNT:
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return (sysctl_handle_opaque(oidp,
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gp->kcount, gp->kcountsize, req));
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case GPROF_FROMS:
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return (sysctl_handle_opaque(oidp,
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gp->froms, gp->fromssize, req));
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case GPROF_TOS:
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return (sysctl_handle_opaque(oidp,
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gp->tos, gp->tossize, req));
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case GPROF_GMONPARAM:
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return (sysctl_handle_opaque(oidp, gp, sizeof *gp, req));
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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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SYSCTL_NODE(_kern, KERN_PROF, prof, CTLFLAG_RW, sysctl_kern_prof, "");
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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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#ifndef _SYS_SYSPROTO_H_
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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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#endif
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/* ARGSUSED */
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int
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profil(p, uap)
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struct proc *p;
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register struct profil_args *uap;
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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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