[Crash-utility] Kernel pages reported as PAGE_EXCLUDED

[Stefan Hajnoczi]

On Fri, Nov 08, 2013 at 02:58:24PM -0500, Dave Anderson wrote:
> ----- Original Message -----
> > > Does this mean these kernel pages are *not* zero?
> 
> The reason the answer is "not necessarily" is because it is highly
> likely that a zero-filled page may have been pre-filtered by one of the
> other DL_EXCLUDE_xxx bits, and therefore it would have been excluded
> prior to the subsequent DL_EXCLUDE_ZERO check.
> 
> And again, the --zero_excluded flag allows a crash user to prevent
> a command from failing due to an excluded page.  But the result of
> doing so is also completely unpredictable, so it should only be used
> with care and understanding...

Thanks.  I suspect the page is free and will dig into the memory
allocator.

Stefan