Re: [Crash-utility] RFC: Improving crash's search speed
On Tue, 2011-01-25 at 21:50 +0000, Dave Anderson wrote:
>
> The attached patch implements the -K option that is the same as doing
> "-k -e <vmalloc_start_addr>".
>
> Comments?
> Bob Montgomery
I like the idea...
But it won't work on ia64 machines, where the vmalloc space is contained
within the region starting at a000000000000000, which is below the unity-mapped
region starting at e000000000000000.
...
So it looks like it might need a hack for ia64 anyway, which
already has a few. I don't think any of the other arches have
their vmalloc regions below their unity-mapped regions.
Dave
So -K should really be defined as "search the identity-mapped region",
maybe? Perhaps a mach-specific utility routine to return start and end
for that region which become the defaults for -K search??
My own tools are really "search physical pages", but I didn't see that
mechanism in crash (though it might be there?).
It's been a while since ia64 was my main architecture :-)
Bob Montgomery