Re: MSEC_TO_JIFFIES is messed up...
From: <hidden>
Date: 2004-05-12 21:10:02
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On Wed, 12 May 2004 22:50:28 +0200, Ingo Molnar said:
quoted hunk
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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