[Crash-utility] Crash physical search on live session not recommended :-)

[Dave Anderson]

----- Original Message -----

... [ cut ] ...

> I'm guessing that's bad :-) I'll implement the rejector code in the
> physical search, and see if I can avoid a trip to the machine room.
> 
> Are your systems avoiding this because of a /dev/crash vs /dev/mem
> difference?

Maybe so -- at least on the architectures that use /dev/crash,
i.e., those that impose CONFIG_STRICT_DEVMEM, because the RHEL
/dev/crash driver requires the pfn to get past page_is_ram().

But because page_is_ram() is not exported on non-RHEL kernels, the
page_is_ram() check is commented out of the sample /dev/crash driver
included in the crash source tree in the memory_driver subdirectory.

Dave