Questions about alloc_large_system_hash() and TLB entries

[Eric Dumazet]

alloc_large_system_hash() is used to allocate large hash tables at boot time.

Example on a 2 nodes NUMA machine :

Inode-cache hash table entries: 1048576 (order: 11, 8388608 bytes)
IP route cache hash table entries: 2097152 (order: 12, 16777216 bytes)
TCP established hash table entries: 2097152 (order: 12, 16777216 bytes)

Memory is taken from :
	bootmem if (flags & HASH_EARLY)
        __vmalloc() if (hashdist is set) (NUMA knob)
        __get_free_pages(GFP_ATOMIC, order);


What would be the needed changes in the code to get both :

  - Allocate ram equally from all the nodes of the machine

  - Use large pages (2MB) to lower TLB stress

Thank you
Eric
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