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    Subject[PATCH-2.4] make log buffer length selectable
    On Mon, Aug 25, 2003 at 04:48:30AM -0700, Marcelo Tosatti wrote:
    > final:
    >
    > - 2.4.22-rc4 was released as 2.4.22 with no changes.

    Hi Marcelo,

    as you requested, here is the log_buf_len patch for inclusion in 23-pre.

    Cheers,
    Willy


    diff -urN wt10-pre3/Documentation/Configure.help wt10-pre3-log-buf-len/Documentation/Configure.help
    --- wt10-pre3/Documentation/Configure.help Wed Mar 19 09:58:25 2003
    +++ wt10-pre3-log-buf-len/Documentation/Configure.help Tue Mar 25 08:20:35 2003
    @@ -25231,6 +25231,19 @@
    output to the second serial port on these devices. Saying N will
    cause the debug messages to appear on the first serial port.

    +Kernel log buffer length shift
    +CONFIG_LOG_BUF_SHIFT
    + The kernel log buffer has a fixed size of :
    + 64 kB (2^16) on MULTIQUAD and IA64,
    + 128 kB (2^17) on S390
    + 32 kB (2^15) on SMP systems
    + 16 kB (2^14) on UP systems
    +
    + You have the ability to change this size with this paramter which
    + fixes the bit shift of to get the buffer length (which must be a
    + power of 2). Eg: a value of 16 sets the buffer to 64 kB (2^16).
    + The default value of 0 uses standard values above.
    +
    Disable pgtable cache
    CONFIG_NO_PGT_CACHE
    Normally the kernel maintains a `quicklist' of preallocated
    diff -urN wt10-pre3/arch/i386/config.in wt10-pre3-log-buf-len/arch/i386/config.in
    --- wt10-pre3/arch/i386/config.in Wed Mar 19 09:58:25 2003
    +++ wt10-pre3-log-buf-len/arch/i386/config.in Tue Mar 25 08:25:12 2003
    @@ -508,6 +508,8 @@
    string ' Initial kernel command line' CONFIG_CMDLINE "root=301 ro"
    fi

    +int 'Kernel messages buffer length shift (0 = default)' CONFIG_LOG_BUF_SHIFT 0
    +
    endmenu

    source lib/Config.in
    diff -urN wt10-pre3/kernel/printk.c wt10-pre3-log-buf-len/kernel/printk.c
    --- wt10-pre3/kernel/printk.c Wed Mar 19 09:58:20 2003
    +++ wt10-pre3-log-buf-len/kernel/printk.c Tue Mar 25 08:14:55 2003
    @@ -29,6 +29,7 @@

    #include <asm/uaccess.h>

    +#if !defined(CONFIG_LOG_BUF_SHIFT) || (CONFIG_LOG_BUF_SHIFT - 0 == 0)
    #if defined(CONFIG_MULTIQUAD) || defined(CONFIG_IA64)
    #define LOG_BUF_LEN (65536)
    #elif defined(CONFIG_ARCH_S390)
    @@ -37,6 +38,9 @@
    #define LOG_BUF_LEN (32768)
    #else
    #define LOG_BUF_LEN (16384) /* This must be a power of two */
    +#endif
    +#else /* CONFIG_LOG_BUF_SHIFT */
    +#define LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
    #endif

    #define LOG_BUF_MASK (LOG_BUF_LEN-1)
    -
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