Alexander E. Patrakov wrote:
Matheus Izvekov wrote:
On 5/24/06, Alexander E. Patrakov <[email protected]> wrote:
Jon Smirl wrote:
> You can't change the mode, instead you have to track it and use the
> one that is already set.
OK, this doesn't change my other point: use in-kernel text output
facility for
panics only.
It would be a good idea to allow oopses to be shown too. For example,
your main disk controller driver may oops, and then you have no way to
tell what happened, because if you try to run dmesg it may deadlock,
and obviously the oops message wont be logged either.
So a BSOD which allows you to hit enter to continue after an oops is
not a bad idea.
Now suppose this.
The kernel has to save the video memory contents somewhereto restore
it after pressing Enter. This may swap something out. Whoops, swap is
on that failed disk.
No. The kernel _tries_ to allocate memory for saving the screen, but
using routines that allocates memory immediately without waiting
for swapout. (i.e. just use the free memory pools, and possibly discarding
non-dirty pages.)
If this allocation fails, which it may do, just overwrite graphichs memory
anyway and loose the display contents. The machine is in trouble anyway.
Helge Hafting
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