[PATCH][2.6.20-rc1-mm1] sparsemem vmem_map optimzed pfn_valid() [0/2]

This patch implements pfn_valid() micro optimization.

This uses ia64_pfn_valid() idea to check mem_map is valid or not instead of
sparsemem's logic.

By this, we'll not access mem_section[] in usual ops.

I attaches my easy test result with *micro* benchmark on SMP system.
I'm glad if you give me an advice about testing.

-Kame
==
AIM Independent Resource Benchmark - Suite IX "1.1"

test on 
CPU: Itanium2(madison) 1.3GHz x2, SMP
Memory: memory 8G
2.6.20-rc1-m1 / 
  extreme means  SPARSEMEM_VMEMMAP=n
  vmem_map means SPARSEMEM_VMEMMAP=y + optimze pfn_valid patch.
==
                extreme	    vmem_map
creat-clo       136322      136989  File Creations and Closes per second
page_test       1042187     1076976 System Allocations & Pages per second
brk_test        2678559     2727286 System Memory Allocations per second
signal_test     309525      321052  Signal Traps per second
exec_test       803         801     Program Loads per second
fork_test       9354        9679    Task Creations per second
disk_rr         103766      103970  Random Disk Reads (K) per second
disk_rw         82978       80244   Random Disk Writes (K) per second
disk_rd         802548      872983  Sequential Disk Reads (K) per second
disk_wrt        130342      131408  Sequential Disk Writes (K) per second
disk_cp         107498      107823  Disk Copies (K) per second
sync_disk_rw    800         752     Sync Random Disk Writes (K) per second
sync_disk_wrt   81          78      Sync Sequential Disk Writes (K) per second
sync_disk_cp    84          78      Sync Disk Copies (K) per second
disk_src        44417       44379   Directory Searches per second
mem_rtns_1      3239352     3222140 Dynamic Memory Operations per second
mem_rtns_2      1157321     1155260 Block Memory Operations per second
misc_rtns_1     10799       10993   Auxiliary Loops per second
dir_rtns_1      1276159     1373725 Directory Operations per second
shell_rtns_1    175         176     Shell Scripts per second
shell_rtns_2    174         175     Shell Scripts per second
shell_rtns_3    175         175     Shell Scripts per second
shared_memory   646725      628769  Shared Memory Operations per second
tcp_test        93258       94928   TCP/IP Messages per second
udp_test        177984      177276  UDP/IP DataGrams per second
fifo_test       362774      385434  FIFO Messages per second
stream_pipe     320825      325931  Stream Pipe Messages per second
dgram_pipe      300789      303339  DataGram Pipe Messages per second
pipe_cpy        410539      449521  Pipe Messages per second

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