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back to using timespec, but convert to microseconds to prevent overflow.

This commit is contained in:
christos 2011-10-25 18:26:09 +00:00
parent 54c647c0b1
commit b00fe7a7a8
1 changed files with 9 additions and 11 deletions
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20
sys/kern/subr_cpufreq.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_cpufreq.c,v 1.6 2011/10/25 11:35:49 jruoho Exp $ */
/* $NetBSD: subr_cpufreq.c,v 1.7 2011/10/25 18:26:09 christos Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_cpufreq.c,v 1.6 2011/10/25 11:35:49 jruoho Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_cpufreq.c,v 1.7 2011/10/25 18:26:09 christos Exp $");
#include <sys/param.h>
#include <sys/cpu.h>
@ -156,7 +156,7 @@ static int
cpufreq_latency(void)
{
struct cpufreq *cf = cf_backend;
struct timeval nta, ntb;
struct timespec nta, ntb;
const uint32_t n = 10;
uint32_t i, j, l, m;
uint64_t s;
@ -182,22 +182,20 @@ cpufreq_latency(void)
cpufreq_set_all_raw(m);
}
nta.tv_sec = nta.tv_usec = 0;
ntb.tv_sec = ntb.tv_usec = 0;
microtime(&nta);
nanotime(&nta);
cpufreq_set_all_raw(cf->cf_state[i].cfs_freq);
microtime(&ntb);
timersub(&ntb, &nta, &ntb);
nanotime(&ntb);
timespecsub(&ntb, &nta, &ntb);
if (ntb.tv_sec != 0 ||
ntb.tv_usec > CPUFREQ_LATENCY_MAX)
ntb.tv_nsec > CPUFREQ_LATENCY_MAX)
continue;
if (s >= UINT64_MAX - CPUFREQ_LATENCY_MAX)
break;
s += ntb.tv_usec;
/* Convert to microseconds to prevent overflow */
s += ntb.tv_nsec / 1000;
}
/*