Add a microtime() implementation that interpolates between ticks
using the cycle counter. MP-safeness is achieved by giving each CPU its own PCC frequency variables, and kicking the non-primary processors via an IPI once per second. Based on the sample code from David Mills' "A Kernel Model for Precision Timekeeping".
This commit is contained in:
thorpej
parent
86d8020753
commit
53c1b3f9d7
@ -1,4 +1,4 @@
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/* $NetBSD: clock.c,v 1.29 2000/06/05 21:47:10 thorpej Exp $ */
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/* $NetBSD: clock.c,v 1.30 2001/04/28 06:10:49 thorpej Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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@ -44,7 +44,7 @@
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.29 2000/06/05 21:47:10 thorpej Exp $");
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__KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.30 2001/04/28 06:10:49 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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@ -76,10 +76,6 @@ __KERNEL_RCSID(0, "$NetBSD: clock.c,v 1.29 2000/06/05 21:47:10 thorpej Exp $");
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#define UNIX_YEAR_OFFSET 0
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#endif
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#ifdef NTP
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extern long time_precision; /* kern_clock.c; clock resolution in microseconds. */
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#endif
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struct device *clockdev;
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const struct clockfns *clockfns;
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int clockinitted;
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@ -133,13 +129,6 @@ cpu_initclocks()
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tickfix >>= (ftp - 1);
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tickfixinterval = hz >> (ftp - 1);
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}
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#ifdef NTP
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/*
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* Since we don't have a "real" microtime, our actual
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* precision is limited to the hardclock interrupt rate.
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*/
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time_precision = tick;
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#endif
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/*
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* Establish the clock interrupt; it's a special case.
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@ -1,7 +1,7 @@
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/* $NetBSD: interrupt.c,v 1.58 2001/04/15 23:26:05 thorpej Exp $ */
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/* $NetBSD: interrupt.c,v 1.59 2001/04/28 06:10:49 thorpej Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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* Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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@ -72,7 +72,7 @@
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: interrupt.c,v 1.58 2001/04/15 23:26:05 thorpej Exp $");
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__KERNEL_RCSID(0, "$NetBSD: interrupt.c,v 1.59 2001/04/28 06:10:49 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -80,6 +80,7 @@ __KERNEL_RCSID(0, "$NetBSD: interrupt.c,v 1.58 2001/04/15 23:26:05 thorpej Exp $
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#include <sys/vmmeter.h>
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#include <sys/sched.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <machine/cpuvar.h>
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@ -107,6 +108,7 @@ void
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interrupt(unsigned long a0, unsigned long a1, unsigned long a2,
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struct trapframe *framep)
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{
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static int microset_iter; /* call microset() once per sec. */
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struct cpu_info *ci = curcpu();
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struct cpu_softc *sc = ci->ci_softc;
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struct proc *p;
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@ -141,6 +143,22 @@ interrupt(unsigned long a0, unsigned long a1, unsigned long a2,
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*/
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sc->sc_evcnt_clock.ev_count++;
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uvmexp.intrs++;
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/*
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* Update the PCC frequency for use by microtime().
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*/
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if (
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#if defined(MULTIPROCESSOR)
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CPU_IS_PRIMARY(ci) &&
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#endif
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microset_iter-- == 0) {
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microset_iter = hz;
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#if defined(MULTIPROCESSOR)
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alpha_multicast_ipi(cpus_running,
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ALPHA_IPI_MICROSET);
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#endif
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microset(ci, framep);
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}
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if (platform.clockintr) {
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/*
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* Call hardclock(). This will also call
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@ -1,4 +1,4 @@
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/* $NetBSD: ipifuncs.c,v 1.27 2001/04/21 16:27:10 thorpej Exp $ */
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/* $NetBSD: ipifuncs.c,v 1.28 2001/04/28 06:10:49 thorpej Exp $ */
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/*-
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* Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
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@ -39,7 +39,7 @@
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: ipifuncs.c,v 1.27 2001/04/21 16:27:10 thorpej Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ipifuncs.c,v 1.28 2001/04/28 06:10:49 thorpej Exp $");
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/*
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* Interprocessor interrupt handlers.
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@ -78,6 +78,7 @@ void alpha_ipi_pause(struct cpu_info *, struct trapframe *);
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*/
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ipifunc_t ipifuncs[ALPHA_NIPIS] = {
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alpha_ipi_halt,
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microset,
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alpha_ipi_tbia,
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alpha_ipi_tbiap,
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pmap_do_tlb_shootdown,
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@ -91,6 +92,7 @@ ipifunc_t ipifuncs[ALPHA_NIPIS] = {
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const char *ipinames[ALPHA_NIPIS] = {
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"halt ipi",
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"microset ipi",
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"tbia ipi",
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"tbiap ipi",
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"shootdown ipi",
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@ -1,4 +1,4 @@
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/* $NetBSD: machdep.c,v 1.241 2001/04/26 03:10:44 ross Exp $ */
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/* $NetBSD: machdep.c,v 1.242 2001/04/28 06:10:49 thorpej Exp $ */
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/*-
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* Copyright (c) 1998, 1999, 2000 The NetBSD Foundation, Inc.
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@ -73,7 +73,7 @@
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.241 2001/04/26 03:10:44 ross Exp $");
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__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.242 2001/04/28 06:10:49 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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@ -1942,46 +1942,6 @@ remrunqueue(p)
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sched_whichqs &= ~(1 << bit);
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}
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/*
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* Return the best possible estimate of the time in the timeval
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* to which tvp points. Unfortunately, we can't read the hardware registers.
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* We guarantee that the time will be greater than the value obtained by a
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* previous call.
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*
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* XXX PLEASE REWRITE ME TO USE THE CYCLE COUNTER AND DEAL WITH
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* XXX MULTIPLE CPUs IN A SANE WAY!
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*/
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void
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microtime(tvp)
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register struct timeval *tvp;
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{
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static struct timeval lasttime;
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static struct simplelock microtime_slock = SIMPLELOCK_INITIALIZER;
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int s;
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s = splclock();
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simple_lock(µtime_slock);
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*tvp = time;
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#ifdef notdef
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tvp->tv_usec += clkread();
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while (tvp->tv_usec >= 1000000) {
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tvp->tv_sec++;
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tvp->tv_usec -= 1000000;
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}
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#endif
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if (tvp->tv_sec == lasttime.tv_sec &&
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tvp->tv_usec <= lasttime.tv_usec &&
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(tvp->tv_usec = lasttime.tv_usec + 1) >= 1000000) {
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tvp->tv_sec++;
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tvp->tv_usec -= 1000000;
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}
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lasttime = *tvp;
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simple_unlock(µtime_slock);
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splx(s);
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}
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/*
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* Wait "n" microseconds.
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*/
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207
sys/arch/alpha/alpha/microtime.c
Normal file
207
sys/arch/alpha/alpha/microtime.c
Normal file
@ -0,0 +1,207 @@
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/* $NetBSD: microtime.c,v 1.1 2001/04/28 06:10:49 thorpej Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/******************************************************************************
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* *
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* Copyright (c) David L. Mills 1993, 1994 *
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* *
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* Permission to use, copy, modify, and distribute this software and its *
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* documentation for any purpose and without fee is hereby granted, provided *
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* that the above copyright notice appears in all copies and that both the *
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* copyright notice and this permission notice appear in supporting *
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* documentation, and that the name University of Delaware not be used in *
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* advertising or publicity pertaining to distribution of the software *
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* without specific, written prior permission. The University of Delaware *
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* makes no representations about the suitability this software for any *
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* purpose. It is provided "as is" without express or implied warranty. *
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* *
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******************************************************************************/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: microtime.c,v 1.1 2001/04/28 06:10:49 thorpej Exp $");
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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 <machine/cpu.h>
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#include <machine/rpb.h>
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/*
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* Return the best possible estimate of the time in the timeval to which
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* tvp points. The kernel logical time variable is interpolated between
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* ticks by reading the PCC to determine the number of cycles since the
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* last processor update, then converting the result to microseconds. In
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* the case of multiprocessor systems, the interpolation is specific to
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* each processor, since each processor has its own PCC.
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*/
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void
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microtime(struct timeval *tvp)
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{
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static struct timeval lasttime;
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static struct simplelock microtime_slock = SIMPLELOCK_INITIALIZER;
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struct timeval t, st;
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struct cpu_info *ci = curcpu();
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long sec, usec;
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int s;
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s = splclock(); /* also blocks IPIs */
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/* XXXSMP: not atomic */
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st = time; /* read system time */
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if (ci->ci_pcc_denom != 0) {
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/*
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* Determine the current clock time as the time at last
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* microset() call, plus the PCC accumulation since then.
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* This time should lie in the interval between the current
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* master clock time and the time at the nexdt tick, but
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* this code does not explicitly require that in the interest
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* of speed. If something ugly occurs, like a settimeofday()
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* call, the processors may disagree among themselves for not
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* more than the interval between microset() calls. In any
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* case, the following sanity checks will suppress timewarps.
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*/
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t = ci->ci_pcc_time;
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usec = (alpha_rpcc() & 0xffffffffUL) - ci->ci_pcc_pcc;
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if (usec < 0)
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usec += 0x100000000L;
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t.tv_usec = (usec * ci->ci_pcc_ms_delta) / ci->ci_pcc_denom;
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while (t.tv_usec >= 1000000) {
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t.tv_usec -= 1000000;
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t.tv_sec++;
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}
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} else {
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/*
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* Can't use the PCC -- just use the system time.
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*/
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t = st;
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}
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/*
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* Ordinarily, the current clock time is guaranteed to be later
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* by at least one microsecond than the last time the clock was
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* read. However, this rule applies only if the current time is
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* within one second of the last time. Otherwise, the clock will
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* (shudder) be set backward. The clock adjustment daemon or
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* human equivalent is presumed to be correctly implemented and
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* to set the clock backward only upon unavoidable crisis.
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*/
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simple_lock(µtime_slock);
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sec = lasttime.tv_sec - t.tv_sec;
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usec = lasttime.tv_usec - t.tv_usec;
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if (usec < 0) {
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usec += 1000000;
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sec--;
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}
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if (sec == 0) {
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t.tv_usec += usec + 1;
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if (t.tv_usec >= 1000000) {
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t.tv_usec -= 1000000;
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t.tv_sec++;
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}
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}
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lasttime = t;
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simple_unlock(µtime_slock);
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splx(s);
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*tvp = t;
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}
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/*
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* This routine is called about once per second directly by the master
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* processor and via an interprocessor interrupt for other processors.
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* It determines the PCC frequency of each processor relative to the
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* master clock and the time this determination is made. These values
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* are used by microtime() to interpolate the microseconds between
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* timer interrupts. Note that we assume the kernel variables have
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* been zeroed early in life.
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*/
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void
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microset(struct cpu_info *ci, struct trapframe *framep)
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{
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struct timeval t;
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long delta, denom;
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/* Note: Clock interrupts are already blocked. */
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/* XXX BLOCK MACHINE CHECKS? */
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denom = ci->ci_pcc_pcc;
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t = time; /* XXXSMP: not atomic */
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ci->ci_pcc_pcc = alpha_rpcc() & 0xffffffffUL;
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/* XXX UNBLOCK MACHINE CHECKS? */
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if (ci->ci_pcc_denom == 0) {
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/*
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* This is our first time here on this CPU. Just
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* start with reasonable initial values.
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*/
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ci->ci_pcc_time = t;
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ci->ci_pcc_ms_delta = 1000000;
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ci->ci_pcc_denom = hwrpb->rpb_cc_freq;
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return;
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}
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denom = ci->ci_pcc_pcc - denom;
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if (denom < 0)
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denom += 0x100000000L;
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delta = (t.tv_sec - ci->ci_pcc_time.tv_sec) * 1000000 +
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(t.tv_usec - ci->ci_pcc_time.tv_usec);
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ci->ci_pcc_time = t;
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/*
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* Make sure it's within .5 to 1.5 seconds -- otherwise,
|
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* the time is probably be frobbed with by the timekeeper
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* or the human.
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*/
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if (delta > 500000 && delta < 15000000) {
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ci->ci_pcc_ms_delta = delta;
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ci->ci_pcc_denom = denom;
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} else {
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#if 0
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printf("microset: delta %d, resetting state\n", delta);
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#endif
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ci->ci_pcc_ms_delta = 1000000;
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ci->ci_pcc_denom = hwrpb->rpb_cc_freq;
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}
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}
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@ -1,4 +1,4 @@
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# $NetBSD: files.alpha,v 1.136 2001/04/26 03:10:45 ross Exp $
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# $NetBSD: files.alpha,v 1.137 2001/04/28 06:10:50 thorpej Exp $
|
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#
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# alpha-specific configuration info
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@ -487,6 +487,7 @@ file arch/alpha/alpha/ipifuncs.c multiprocessor
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file arch/alpha/alpha/machdep.c
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file arch/alpha/alpha/mainbus.c
|
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file arch/alpha/alpha/mem.c
|
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file arch/alpha/alpha/microtime.c
|
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file arch/alpha/alpha/pmap.c
|
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file arch/alpha/alpha/process_machdep.c
|
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file arch/alpha/alpha/procfs_machdep.c procfs
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@ -1,7 +1,7 @@
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/* $NetBSD: cpu.h,v 1.55 2001/04/26 03:10:46 ross Exp $ */
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/* $NetBSD: cpu.h,v 1.56 2001/04/28 06:10:50 thorpej Exp $ */
|
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|
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/*-
|
||||
* Copyright (c) 1998, 1999, 2000 The NetBSD Foundation, Inc.
|
||||
* Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
|
||||
* All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to The NetBSD Foundation
|
||||
@ -130,6 +130,15 @@ struct cpu_info {
|
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u_long ci_want_resched; /* preempt current process */
|
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u_long ci_intrdepth; /* interrupt trap depth */
|
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struct trapframe *ci_db_regs; /* registers for debuggers */
|
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|
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/*
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* Variables used by microtime().
|
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*/
|
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struct timeval ci_pcc_time;
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long ci_pcc_pcc;
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long ci_pcc_ms_delta;
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long ci_pcc_denom;
|
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|
||||
#if defined(MULTIPROCESSOR)
|
||||
__volatile u_long ci_flags; /* flags; see below */
|
||||
__volatile u_long ci_ipis; /* interprocessor interrupts pending */
|
||||
@ -272,6 +281,7 @@ struct rpb;
|
||||
struct trapframe;
|
||||
|
||||
int badaddr(void *, size_t);
|
||||
void microset(struct cpu_info *, struct trapframe *);
|
||||
|
||||
#endif /* _KERNEL */
|
||||
#endif /* _ALPHA_CPU_H_ */
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/* $NetBSD: intr.h,v 1.46 2001/04/20 22:28:58 thorpej Exp $ */
|
||||
/* $NetBSD: intr.h,v 1.47 2001/04/28 06:10:50 thorpej Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
|
||||
@ -158,18 +158,19 @@ _splraise(int s)
|
||||
/*
|
||||
* Interprocessor interrupts. In order how we want them processed.
|
||||
*/
|
||||
#define ALPHA_IPI_HALT 0x0000000000000001UL
|
||||
#define ALPHA_IPI_TBIA 0x0000000000000002UL
|
||||
#define ALPHA_IPI_TBIAP 0x0000000000000004UL
|
||||
#define ALPHA_IPI_SHOOTDOWN 0x0000000000000008UL
|
||||
#define ALPHA_IPI_IMB 0x0000000000000010UL
|
||||
#define ALPHA_IPI_AST 0x0000000000000020UL
|
||||
#define ALPHA_IPI_SYNCH_FPU 0x0000000000000040UL
|
||||
#define ALPHA_IPI_DISCARD_FPU 0x0000000000000080UL
|
||||
#define ALPHA_IPI_PAUSE 0x0000000000000100UL
|
||||
#define ALPHA_IPI_PMAP_REACTIVATE 0x0000000000000200UL
|
||||
#define ALPHA_IPI_HALT (1UL << 0)
|
||||
#define ALPHA_IPI_MICROSET (1UL << 1)
|
||||
#define ALPHA_IPI_TBIA (1UL << 2)
|
||||
#define ALPHA_IPI_TBIAP (1UL << 3)
|
||||
#define ALPHA_IPI_SHOOTDOWN (1UL << 4)
|
||||
#define ALPHA_IPI_IMB (1UL << 5)
|
||||
#define ALPHA_IPI_AST (1UL << 6)
|
||||
#define ALPHA_IPI_SYNCH_FPU (1UL << 7)
|
||||
#define ALPHA_IPI_DISCARD_FPU (1UL << 8)
|
||||
#define ALPHA_IPI_PAUSE (1UL << 9)
|
||||
#define ALPHA_IPI_PMAP_REACTIVATE (1UL << 10)
|
||||
|
||||
#define ALPHA_NIPIS 10 /* must not exceed 64 */
|
||||
#define ALPHA_NIPIS 11 /* must not exceed 64 */
|
||||
|
||||
struct cpu_info;
|
||||
struct trapframe;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user