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Carlo Nonato
95debe51a9
Add a new memory page allocator that implements the cache coloring mechanism. The allocation algorithm enforces equal frequency distribution of cache partitions, following the coloring configuration of a domain. This allows for an even utilization of cache sets for every domain. Pages are stored in a color-indexed array of lists. Those lists are filled by a simple init function which computes the color of each page. When a domain requests a page, the allocator extracts the page from the list with the maximum number of free pages among those that the domain can access, given its coloring configuration. The allocator can only handle requests of order-0 pages. This allows for easier implementation and since cache coloring targets only embedded systems, it's assumed not to be a major problem. The buddy allocator must coexist with the colored one because the Xen heap isn't colored. For this reason a new Kconfig option and a command line parameter are added to let the user set the amount of memory reserved for the buddy allocator. Even when cache coloring is enabled, this memory isn't managed by the colored allocator. Colored heap information is dumped in the dump_heap() debug-key function. Based on original work from: Luca Miccio <lucmiccio@gmail.com> Signed-off-by: Marco Solieri <marco.solieri@minervasys.tech> Signed-off-by: Carlo Nonato <carlo.nonato@minervasys.tech> Reviewed-by: Jan Beulich <jbeulich@suse.com> Acked-by: Michal Orzel <michal.orzel@amd.com>