[PATCH] configurable LOG_BUF_SIZE

From: Randy.Dunlap (rddunlap@osdl.org)
Date: Thu Jan 02 2003 - 18:09:17 EST


Hi,

This patch to 2.5.54 make LOG_BUF_LEN a configurable option.
Actually its shift value is configurable, and that keeps it
a power of 2.

Please apply.

Thanks,

-- 
~Randy

patch_name: logbuf-config-2554.patch patch_version: 2003.01.02 author: Randy Dunlap <rddunlap@osdl.org> description: change LOG_BUF_LEN to a config option (LOG_BUF_SHIFT) product: linux product_versions: 2.5.54 changelog: (a) add in General Setup (b) use a SHIFT value (enforces power of 2, gives more choices) URL: http://www.osdl.org/archive/rddunlap/patches/ requires: kconfig in 2.5.52 or later conflicts: diffstat: init/Kconfig | 45 +++++++++++++++++++++++++++++++++++++++++++++ kernel/printk.c | 11 +---------- 2 files changed, 46 insertions(+), 10 deletions(-)

--- ./kernel/printk.c%LOG Wed Jan 1 19:23:19 2003 +++ ./kernel/printk.c Thu Jan 2 14:48:59 2003 @@ -31,16 +31,7 @@

#include <asm/uaccess.h>

-#if defined(CONFIG_X86_NUMAQ) || defined(CONFIG_IA64) -#define LOG_BUF_LEN (65536) -#elif defined(CONFIG_ARCH_S390) -#define LOG_BUF_LEN (131072) -#elif defined(CONFIG_SMP) -#define LOG_BUF_LEN (32768) -#else -#define LOG_BUF_LEN (16384) /* This must be a power of two */ -#endif - +#define LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT) /* This must be a power of two */ #define LOG_BUF_MASK (LOG_BUF_LEN-1)

/* printk's without a loglevel use this.. */ --- ./init/Kconfig%LOG Thu Jan 2 14:34:27 2003 +++ ./init/Kconfig Thu Jan 2 14:42:01 2003 @@ -98,6 +98,51 @@ building a kernel for install/rescue disks or your system is very limited in memory.

+choice + prompt "Kernel log buffer size" + default LOG_BUF_SHIFT_17 if ARCH_S390 + default LOG_BUF_SHIFT_16 if X86_NUMAQ || IA64 + default LOG_BUF_SHIFT_15 if SMP + default LOG_BUF_SHIFT_14 + help + Select kernel log buffer size from this list (power of 2). + Defaults: 17 (=> 128 KB for S/390) + 16 (=> 64 KB for x86 NUMAQ or IA-64) + 15 (=> 32 KB for SMP) + 14 (=> 16 KB for uniprocessor) + +config LOG_BUF_SHIFT_17 + bool "128 KB" + default y if ARCH_S390 + +config LOG_BUF_SHIFT_16 + bool "64 KB" + default y if X86_NUMAQ || IA64 + +config LOG_BUF_SHIFT_15 + bool "32 KB" + default y if SMP + +config LOG_BUF_SHIFT_14 + bool "16 KB" + +config LOG_BUF_SHIFT_13 + bool "8 KB" + +config LOG_BUF_SHIFT_12 + bool "4 KB" + +endchoice + +config LOG_BUF_SHIFT + int + default 17 if LOG_BUF_SHIFT_17=y + default 16 if LOG_BUF_SHIFT_16=y + default 15 if LOG_BUF_SHIFT_15=y + default 14 if LOG_BUF_SHIFT_14=y + default 13 if LOG_BUF_SHIFT_13=y + default 12 if LOG_BUF_SHIFT_12=y + endmenu

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