Michael S. Tsirkin <mst <at> redhat.com> writes:
At the moment, memory radix tree is already variable width, but it can
only skip the low bits of address.
This is efficient if we have huge memory regions but inefficient if we
are only using a tiny portion of the address space.
After we have built up the map, detect
configurations where a single L2 entry is valid.
We then speed up the lookup by skipping one or more levels.
In case any levels were skipped, we might end up in a valid section
instead of erroring out. We handle this by checking that
the address is in range of the resulting section.
I think this is overkill. It can be done in a simpler way as follows:
phys_page_find(RadixTree* tr, hwaddr index, ...)
{
if (index & rt->invalid_index_mask) {
// not found
}
lp = rt->root;
for (i = rt->nb_levels - 1; i >= 0 && !lp.is_leaf; --i) {
...
This exploits the fact the lower portion of the address space is always
filled, at least in the cases that matter to us.