Hi all,
The below patch implements the table based memory preservation mechanism
I suggested. It is a replacement of this patch. Instead of using an
xarray of bitmaps and converting them into a linked list of bitmaps at
serialization time, it tracks preserved pages in a page table like
format, that needs no extra work when serializing. This results in
noticeably better performance when preserving a large number of pages.
To compare performance, I allocated 48 GiB of memory and preserved it
using KHO. Below is the time taken to make the reservations, and then
serialize that to FDT.
Linked list: 577ms +- 0.7% (6 samples)
Table: 469ms +- 0.6% (6 samples)
