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sched: cleanup, use NSEC_PER_MSEC and NSEC_PER_SEC 

1) hardcoded 1000000000 value is used five times in places where
   NSEC_PER_SEC might be more readable.

2) A conversion from nsec to msec uses the hardcoded 1000000 value,
   which is a candidate for NSEC_PER_MSEC.

no code changed:

    text    data     bss     dec     hex filename
   44359    3326      36   47721    ba69 sched.o.before
   44359    3326      36   47721    ba69 sched.o.after

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Eric Dumazet 2007-11-09 22:39:38 +01:00 committed by Ingo Molnar
parent 19978ca610
commit d6322faf29
2 changed files with 6 additions and 6 deletions
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8
kernel/sched.c
View File

@ -75,7 +75,7 @@
*/
unsigned long long __attribute__((weak)) sched_clock(void)
{
return (unsigned long long)jiffies * (1000000000 / HZ);
return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
}
/*
@ -99,8 +99,8 @@ unsigned long long __attribute__((weak)) sched_clock(void)
/*
* Some helpers for converting nanosecond timing to jiffy resolution
*/
#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (1000000000 / HZ))
#define JIFFIES_TO_NS(TIME) ((TIME) * (1000000000 / HZ))
#define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ))
#define JIFFIES_TO_NS(TIME) ((TIME) * (NSEC_PER_SEC / HZ))
#define NICE_0_LOAD SCHED_LOAD_SCALE
#define NICE_0_SHIFT SCHED_LOAD_SHIFT
@ -7256,7 +7256,7 @@ static u64 cpu_usage_read(struct cgroup *cgrp, struct cftype *cft)
spin_unlock_irqrestore(&cpu_rq(i)->lock, flags);
}
/* Convert from ns to ms */
do_div(res, 1000000);
do_div(res, NSEC_PER_MSEC);
return res;
}

4
kernel/sysctl.c
View File

@ -226,9 +226,9 @@ static struct ctl_table root_table[] = {
#ifdef CONFIG_SCHED_DEBUG
static unsigned long min_sched_granularity_ns = 100000; /* 100 usecs */
static unsigned long max_sched_granularity_ns = 1000000000; /* 1 second */
static unsigned long max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
static unsigned long min_wakeup_granularity_ns; /* 0 usecs */
static unsigned long max_wakeup_granularity_ns = 1000000000; /* 1 second */
static unsigned long max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
#endif
static struct ctl_table kern_table[] = {