From mboxrd@z Thu Jan 1 00:00:00 1970 From: hawkes@sgi.com Date: Tue, 27 Jun 2006 22:01:39 +0000 Subject: [PATCH] ia64: change usermode HZ to 250 Message-Id: <20060627220139.3168.69409.sendpatchset@tomahawk.engr.sgi.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Tony Luck , Andrew Morton , linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jack Steiner , Dan Higgins , hawkes@sgi.com, Jeremy Higdon 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 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 */