Hello,

Hard time to understand cma allocation how differs from normal allocation ?

I know theoretically how cma works.

1. How it reserved the memory (start pfn to end pfn) ? what is bitmap_*
functions ?
2. How alloc_contig_range() works ? it isolate all the pages including
unevictable pages, what is the practical work flow ? all this works with
virtual pages or physical pages ?
3.what start_isolate_page_range() does ?
4. what alloc_contig_migrate_range does() ?
5.what isolate_migratepages_range(), reclaim_clean_pages_from_list(),
 migrate_pages() and shrink_page_list() is doing ?

Please let me know the flow with simple example.

Regards,
Pankaj