On Wed, 12 May 2004 22:50:28 +0200, Ingo Molnar said:
> Content-Disposition: attachment; filename="hz-cleanup-2.6.6-A2"
>
> --- linux/include/linux/time.h.orig
> +++ linux/include/linux/time.h
> @@ -177,6 +177,24 @@ struct timezone {
> (SH_DIV((MAX_JIFFY_OFFSET >> SEC_JIFFIE_SC) * TICK_NSEC, NSEC_PER_SEC,
1) - 1)
>
> #endif
> +
> +/*
> + * Convert jiffies to milliseconds and back.
> + *
> + * Avoid unnecessary multiplications/divisions in the
> + * two most common HZ cases:
> + */
> +#if HZ == 1000
> +# define JIFFIES_TO_MSECS(x) (x)
> +# define MSECS_TO_JIFFIES(x) (x)
> +#elif HZ == 100
> +# define JIFFIES_TO_MSECS(x) ((x) * 10)
> +# define MSECS_TO_JIFFIES(x) ((x) / 10)
> +#else
> +# define JIFFIES_TO_MSECS(x) ((x) * 1000 / HZ)
> +# define MSECS_TO_JIFFIES(x) ((x) * HZ / 1000)
> +#endif
> +
Looks good to me.. :)
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