atikbappy / memory-allocator

a simple kernel tree for storing virtual to physical memory allocations

Author: Sean Myers Project 3: Swap Space

readme: It works for everything asked.

Implementation details:
    -Handle-memory (my main allocator of pages) checks to see if buddy swap returns 0 or not. If it does it envokes the clock algorithm
    -Clock will use the referenced bit to determine which page to evict.
    -Once page is determined, it calls swap_out_page.
    -Swap out page has a swap space, that is just one gigantic "free" bitmap and it looks for and finds a space in the map.
    -When it finds a place it allocates that space(sets the bit to a 1) and then puts it in.
    -Now, any time I get down to the PTE and there is a 0 present, and 1 dirty, I know that it is a swapped page.
    -I pull out the swapped page and set the bits correctly and free up the swap space used.

Notes:
    Last time I said there was an oddity with freeing, I fixed that. Turns out I was only freeing one page even if the request was of size 2 or more.
    Doesn't handle full swap space. If you reach full swap space, it just returns -1 but my on_demand module does nothing with that info so the info is just removed completely from existence