[Ksummit-2012-discuss] [ATTEND] kernel core dump and "dying breath"

Paul Gortmaker paul.gortmaker at windriver.com
Wed Jun 27 14:50:47 UTC 2012

On 12-06-27 09:17 AM, H. Peter Anvin wrote:
> On 06/27/2012 02:52 AM, Cong Wang wrote:
>>> I even sometimes find myself trying to scroll back, even though I know it
>>> doesn't work. So it definitely is something that one is subconsciously
>>> expecting to work.
>> +1
>> /me has the same experience.
> OK, so but the root here is that with USB keyboards and $DEITY knows 
> what else this is a lot harder than it seems; either we have to keep a 

There is another thing that crossed my mind.  Think what we do with the
keyboard when we have one.  Totally predictable.  Hit page up, stare at
it for 30s, hit page up again, etc.  Meaning, that if we instead skip
the whole needing the input, and simulate it at panic, it could be a
nice win for minimal cost.  Page up every 30s.  Hit the top?  Page
down every 30s.  Repeat until power-off.  You could collect the whole
panic message with a camera too, albeit in chunks.


> major chunk of the I/O system alive or have a separate stack for panic 
> only.  In the latter case I would genuinely claim that the first thing 
> to do shouldn't be the keyboard (for scrollback) but a way to insert a 
> USB key for dump.
> 	-hpa

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