NUMA-aware named shared memory for Linux

问题:

The Windows API offers the CreateFileMappingNuma function (http://msdn.microsoft.com/en-us/library/windows/desktop/aa366539(v=vs.85).aspx) to create a named shared memory space on a specific NUMA node.

So far, I have not found an equivalent function for Linux.

My current approach looks like this:

1. Allocate named shared memory (using shm_open(...))
2. Determine current NUMA node (using numa_move_pages(...))
3. Move pages to target Node (using numa_move_pages(...) again)

Does anyone know a better approach?

EDIT: For the record: My proposed implementation does work as expected!

回答1:

That sounds right. Note that there are no pages allocated at the point where you call shm_open()/fruncate() (don't forget ftruncate() to set the size!). The kernel simply creates the vma and waits for future code accesses to fault the pages into physical memory. So calling numa_move_pages() in this state will presumably have the effect of creating and populating new pages in the relevant NUMA nodes.