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    Subject[PATCH] configurable LOG_BUF_SIZE

    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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