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Subject[PATCH] Re: kernel/printk.c: increasing the buffer size to capture devfsd debug messages.
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?

robertdiff -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];
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