config_discontigmem against add_memory_region

["Pichai Raghavan" <ragh_avan@rediffmail.com>]

Hi,

If a Linux system has discontingous memory, then normal practise 
is to call add_memory_region() before calling bootmem allocator. 
In a thread on the net, there is a mention of using 
CONFIG_DISCONTIGMEM for huge memory hole(gain of 2MB for 16MB 
hole)

How does one use CONFIG_DISCONTIGMEM? (is there any code 
available) And how does it manage to save space against 
add_memory_region?

Thanks
Raghav
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