On Tue, Feb 20, 2001 at 01:37:16PM -0600, Thomas Dodd wrote: > Robert Read wrote: > > > > On Wed, Feb 21, 2001 at 02:30:08AM +0900, Ishikawa wrote: > > > > > > Has anyone tried 128K buffer size in kernel/printk.c > > > and still have the kernel boot (without > > > hard to notice memory corruption problems and other subtle bugs)? > > > Any hints and tips will be appreciated. > > > > I have used 128k and larger buffer sizes, and I just noticed this > > fragment in the RedHat Tux Webserver patch. It creates a 2MB buffer: > > I think this should be a config option. Ok, here is a simple patch to add a config option, I'm compiling it now, so it's not tested yet. One question: what is the best way to force this option to be a power of 2? robert
diff -ru linux-2.4.2-pre4/arch/i386/config.in linux-2.4.2-pre4-logbuf/arch/i386/config.in --- linux-2.4.2-pre4/arch/i386/config.in Mon Jan 8 13:27:56 2001 +++ linux-2.4.2-pre4-logbuf/arch/i386/config.in Tue Feb 20 12:10:19 2001 @@ -366,4 +366,5 @@ #bool 'Debug kmalloc/kfree' CONFIG_DEBUG_MALLOC bool 'Magic SysRq key' CONFIG_MAGIC_SYSRQ +int 'Printk buffer size (must be power of 2)' CONFIG_PRINTK_BUF_LEN 16384 endmenu Only in linux-2.4.2-pre4-logbuf/arch/i386: config.in~ Only in linux-2.4.2-pre4-logbuf/include: asm Only in linux-2.4.2-pre4-logbuf/include/linux: autoconf.h Only in linux-2.4.2-pre4-logbuf/include/linux: modules diff -ru linux-2.4.2-pre4/kernel/printk.c linux-2.4.2-pre4-logbuf/kernel/printk.c --- linux-2.4.2-pre4/kernel/printk.c Tue Feb 20 11:56:31 2001 +++ linux-2.4.2-pre4-logbuf/kernel/printk.c Tue Feb 20 11:59:35 2001 @@ -23,7 +23,11 @@ #include <asm/uaccess.h> -#define LOG_BUF_LEN (16384) +#ifdef CONFIG_PRINTK_BUF_LEN +# define LOG_BUF_LEN (CONFIG_PRINTK_BUF_LEN) +#else +# define LOG_BUF_LEN (16384) +#endif #define LOG_BUF_MASK (LOG_BUF_LEN-1) static char buf[1024];
