[PATCH] i386: Selectable Frequency of the Timer Interrupt

Make the timer frequency selectable. The timer interrupt may cause bus
and memory contention in large NUMA systems since the interrupt occurs
on each processor HZ times per second.

Signed-off-by: Christoph Lameter <christoph@lameter.com>
Signed-off-by: Shai Fultheim <shai@scalex86.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 7 insertions, 3 deletions

diff --git a/include/asm-i386/param.h b/include/asm-i386/param.h
index b6440526e42a..fa02e67ea86b 100644
--- a/include/asm-i386/param.h
+++ b/include/asm-i386/param.h
@@ -1,8 +1,10 @@
+#include <linux/config.h>
+
 #ifndef _ASMi386_PARAM_H
 #define _ASMi386_PARAM_H
 
 #ifdef __KERNEL__
-# define HZ             1000            /* Internal kernel timer frequency */
+# define HZ             CONFIG_HZ       /* Internal kernel timer frequency */
 # define USER_HZ        100             /* .. some user interfaces are in "ticks" */
 # define CLOCKS_PER_SEC         (USER_HZ)       /* like times() */
 #endif
diff --git a/include/asm-x86_64/param.h b/include/asm-x86_64/param.h
index b707f0568c9e..40b11937180d 100644
--- a/include/asm-x86_64/param.h
+++ b/include/asm-x86_64/param.h
@@ -1,9 +1,11 @@
+#include <linux/config.h>
+
 #ifndef _ASMx86_64_PARAM_H
 #define _ASMx86_64_PARAM_H
 
 #ifdef __KERNEL__
-# define HZ            1000            /* Internal kernel timer frequency */
-# define USER_HZ       100          /* .. some user interfaces are in "ticks */
+# define HZ            CONFIG_HZ        /* Internal kernel timer frequency */
+# define USER_HZ       100              /* .. some user interfaces are in "ticks */
 #define CLOCKS_PER_SEC        (USER_HZ)       /* like times() */
 #endif