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Introduce a variable "cc" to hold the cpu counter delta, rather than

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overloading "usec". The counter isn't counting micro-seconds, and using
the same variable to mean two different things is false economy: with
this change, the compiled object is 72 bytes smaller on i386, and the
code is easier to understand, to boot.
This commit is contained in:
fredb 2004-06-19 20:02:38 +00:00
parent 8a2c13021f
commit c6f9967d69
1 changed files with 7 additions and 7 deletions
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14
sys/kern/kern_microtime.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_microtime.c,v 1.6 2004/06/19 18:12:55 fredb Exp $ */
/* $NetBSD: kern_microtime.c,v 1.7 2004/06/19 20:02:38 fredb Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@ -54,7 +54,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: kern_microtime.c,v 1.6 2004/06/19 18:12:55 fredb Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_microtime.c,v 1.7 2004/06/19 20:02:38 fredb Exp $");
#include "opt_multiprocessor.h"
@ -83,7 +83,7 @@ cc_microtime(struct timeval *tvp)
static struct simplelock microtime_slock = SIMPLELOCK_INITIALIZER;
struct timeval t;
struct cpu_info *ci = curcpu();
int64_t sec, usec;
int64_t cc, sec, usec;
int s;
#ifdef MULTIPROCESSOR
@ -105,10 +105,10 @@ cc_microtime(struct timeval *tvp)
* case, the following sanity checks will suppress timewarps.
*/
t = ci->ci_cc_time;
usec = cpu_counter32() - ci->ci_cc_cc;
if (usec < 0)
usec += 0x100000000LL;
t.tv_usec += (usec * ci->ci_cc_ms_delta) / ci->ci_cc_denom;
cc = cpu_counter32() - ci->ci_cc_cc;
if (cc < 0)
cc += 0x100000000LL;
t.tv_usec += (cc / (ci->ci_cc_denom / ci->ci_cc_ms_delta));
while (t.tv_usec >= 1000000) {
t.tv_usec -= 1000000;
t.tv_sec++;