Re: [PATCH] Work around for periodic do_gettimeofday hang

[James Bottomley]

On Wed, 2004-11-24 at 13:13, Arjan van de Ven wrote:
> while I agree with 100Hz for slower cpus, I rather have a config option for it so people
> (and distros) can select it independent of the exact cpu type they want to compile a kernel for

How about this then?

James

===== arch/i386/Kconfig 1.134 vs edited =====
--- 1.134/arch/i386/Kconfig	2004-10-21 20:35:11 -05:00
+++ edited/arch/i386/Kconfig	2004-11-24 20:56:53 -06:00
@@ -330,6 +330,14 @@
 
 endchoice
 
+config X86_HZ
+       int "Clock Tick Rate"
+       default 1000 if !(M386 || M486 || M586 || M586TSC || M586MMX)	
+       default 100 if (M386 || M486 || M586 || M586TSC || M586MMX)	
+       help
+	  Select the kernel clock tick rate in interrupts per second.
+	  Slower processors should choose 100; everything else 1000.
+
 config X86_GENERIC
        bool "Generic x86 support"
        help
===== include/asm-i386/param.h 1.6 vs edited =====
--- 1.6/include/asm-i386/param.h	2004-06-24 03:55:46 -05:00
+++ edited/include/asm-i386/param.h	2004-11-24 20:56:18 -06:00
@@ -1,8 +1,10 @@
 #ifndef _ASMi386_PARAM_H
 #define _ASMi386_PARAM_H
 
+#include <linux/config.h>
+
 #ifdef __KERNEL__
-# define HZ		1000		/* Internal kernel timer frequency */
+# define HZ		(CONFIG_X86_HZ)
 # define USER_HZ	100		/* .. some user interfaces are in "ticks" */
 # define CLOCKS_PER_SEC		(USER_HZ)	/* like times() */
 #endif

-
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