[Xen-devel] RE: Memory fragmentation, order>0 allocation, and 4.0 dynamic RAM optimization features

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> 18.02.10 17:09 >>>
>But ignoring my flimsy excuses, Jan, do you have some debug code
>you are using to identify order>0 allocations?  If so, could I
>have a copy... and perhaps Keir would consider adding
>it post-4.0 to make it easier to search-and-destroy.

I actually noticed this only as a side effect from a much uglier debugging
patch - observing apparent memory corruption with no apparent pattern
during save/restore/migrate, I finally decided to try a brute force method
and track all allocations. Since you are so eager to point out and fix all
order > 0 allocations, I was quite surprised to see one while tmem
itself initialized its state for Dom0. Hence I thought I'd point it out. The
patch as it stands is, I think, not really a general debugging aid - if you
think differently, I can of course still share it.

Jan


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