linux-kernel - Re: [PATCH 03/15] KDB: up the default LINES value

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Date:	Mon, 25 Mar 2013 14:31:52 -0700
From:	Mike Travis <travis@....com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kgdb-bugreport@...ts.sourceforge.net, x86@...nel.org,
	linux-kernel@...r.kernel.org, Tim Bird <tim.bird@...sony.com>
Subject: Re: [PATCH 03/15] KDB: up the default LINES value



On 3/25/2013 2:22 PM, Jason Wessel wrote:
> On 03/25/2013 01:50 PM, Mike Travis wrote:
>> Currently the default for the # of lines displayed by the KDB pager
>> is 24.  This does not allow all of the lines for the entry messages,
>> reg dump and process trace.  Increase it to something more reasonable.
>>
> 
> 
> Unfortunately this is something that breaks compatibility with the
> standard VGA console, so this patch will not be merged.
> 
> Is it the case that your hardware specifies how many lines and columns
> there are in the display?  We have some hooks into the console VT code
> to properly detect this but perhaps something is wrong there, or it is
> only called in the KMS (kernel mode setting case).  Example:
> drivers/tty/vt/vt.c - look at con_debug_enter()
> 
> Another option might be to add a variable which allows you to change
> the default at compile time, but I would prefer to get the auto detect
> code working properly if it is an option.
> 
> Jason.

Nah, this was more of an annoyance before I added the "system nmi" entry
reason code, which changes the entry message to be more like it is for a
requested entry (like sysreq 'g') than it is for a real error which 
dumps a ton of stuff.  Our primary system console is a serial connection,
so we can't use the VT stuff (though the VT console is an option).
> 
> 
> 
>> Cc: Tim Bird <tim.bird@...sony.com>
>> Reviewed-by: Dimitri Sivanich <sivanich@....com>
>> Signed-off-by: Mike Travis <travis@....com>
>> ---
>>  kernel/debug/kdb/kdb_io.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> --- linux.orig/kernel/debug/kdb/kdb_io.c
>> +++ linux/kernel/debug/kdb/kdb_io.c
>> @@ -586,7 +586,7 @@ int vkdb_printf(const char *fmt, va_list
>>  
>>  	diag = kdbgetintenv("LINES", &linecount);
>>  	if (diag || linecount <= 1)
>> -		linecount = 24;
>> +		linecount = 60;
>>  
>>  	diag = kdbgetintenv("COLUMNS", &colcount);
>>  	if (diag || colcount <= 1)
>>
>> -- 
>>
> 
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