Messages in this thread Patch in this message | | | From | hawkes@sgi ... | Date | Tue, 27 Jun 2006 15:01:39 -0700 | Subject | [PATCH] ia64: change usermode HZ to 250 |
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include/asm-ia64/param.h defines HZ to be 1024 for usermode use, i.e., when the file gets installed as /usr/include/asm/param.h. As the comment says: Technically, this is wrong, but some old apps still refer to it. The proper way to get the HZ value is via sysconf(_SC_CLK_TCK). At the very least, this technically wrong #define ought to reflect the current default value (250) used by all arch/ia64 platforms. No one uses 1024 anymore. This makes those "old apps" (e.g., usr/bin/iostat) behave properly for with a default kernel. (And at some point, the define ought to be removed altogether, which would expose all the applications that erroneously expect HZ to be a compile-time constant.)
Signed-off-by: John Hawkes <hawkes@sgi.com>
Index: linux/include/asm-ia64/param.h =================================================================== --- linux.orig/include/asm-ia64/param.h 2006-06-17 18:49:35.000000000 -0700 +++ linux/include/asm-ia64/param.h 2006-06-27 14:46:53.119407077 -0700 @@ -36,7 +36,7 @@ * Technically, this is wrong, but some old apps still refer to it. The proper way to * get the HZ value is via sysconf(_SC_CLK_TCK). */ -# define HZ 1024 +# define HZ 250 #endif #endif /* _ASM_IA64_PARAM_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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