I found that you said retrieving tid first is sufficient to do
things right in old discussion. :)

Right but the tid can be obtained from a different processor.


One other aspect of this patchset is that it reduces the cache footprint
of the alloc and free functions. This typically results in a performance
increase for the allocator. If we can avoid the page_address() and
virt_to_head_page() stuff that is required because we drop the ->page
field in a sufficient number of places then this may be a benefit that
goes beyond the RT and CONFIG_PREEMPT case.


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