5fdfc2b893
With this change, dbench with >= 4 processes runs without getting weird jumps forward in time when the APCI pmtimer is the default timecounter. Obtained from: NetApp
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/*-
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* Copyright (c) 2012 NetApp, Inc.
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <machine/cpufunc.h>
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#include <stdio.h>
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#include <time.h>
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#include <assert.h>
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#include <pthread.h>
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#include "inout.h"
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/*
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* The ACPI Power Management timer is a free-running 24- or 32-bit
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* timer with a frequency of 3.579545MHz
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*
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* This implementation will be 32-bits
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*/
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#define IO_PMTMR 0x408 /* 4-byte i/o port for the timer */
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#define PMTMR_FREQ 3579545 /* 3.579545MHz */
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static pthread_mutex_t pmtmr_mtx;
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static uint64_t pmtmr_tscf;
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static uint64_t pmtmr_old;
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static uint64_t pmtmr_tsc_old;
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static uint32_t
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pmtmr_val(void)
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{
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uint64_t pmtmr_tsc_new;
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uint64_t pmtmr_new;
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static int inited = 0;
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if (!inited) {
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size_t len;
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uint32_t tmpf;
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inited = 1;
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pthread_mutex_init(&pmtmr_mtx, NULL);
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len = sizeof(tmpf);
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sysctlbyname("machdep.tsc_freq", &tmpf, &len,
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NULL, 0);
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pmtmr_tscf = tmpf;
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pmtmr_tsc_old = rdtsc();
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pmtmr_old = pmtmr_tsc_old / pmtmr_tscf * PMTMR_FREQ;
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return (pmtmr_old);
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}
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pthread_mutex_lock(&pmtmr_mtx);
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pmtmr_tsc_new = rdtsc();
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pmtmr_new = (pmtmr_tsc_new - pmtmr_tsc_old) * PMTMR_FREQ / pmtmr_tscf +
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pmtmr_old;
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pmtmr_old = pmtmr_new;
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pmtmr_tsc_old = pmtmr_tsc_new;
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pthread_mutex_unlock(&pmtmr_mtx);
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return (pmtmr_new);
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}
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static int
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pmtmr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
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uint32_t *eax, void *arg)
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{
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assert(in == 1);
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if (bytes != 4)
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return (-1);
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*eax = pmtmr_val();
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return (0);
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}
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INOUT_PORT(pmtmr, IO_PMTMR, IOPORT_F_IN, pmtmr_handler);
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