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fsmlabs的real time linux的内核

larg_mem.o:
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Example of allocating large amounts of memory at boot time - to use this 
you must edit the larg_mem.c program and adjust memstart memend to the values
you pass to the kernel in the mem= line and the physical memory installed
the defaults in the example here assumes that you passed 

mem=96M

at the kernel boot prompt and have 128MB installed, giving you 32MB that 
you can use for RTLinux.

On a 128MB box with mem=96  cat /proc/meminfo  should show something like

        total:    used:    free:  shared: buffers:  cached:
Mem:  97411072 90025984  7385088        0 10190848 58822656


All this example will do (whith the default settings) is fill up these 32MB 
with the index of the (unsigned long) large location . 

Module options:

    memstart=BYTE_OFFSET physical address at which reserved memory starts
    memlength=BYTES      length of memory block to reserve
    period=MICROSECONDS  period of the main loop


larg_stack.o:
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 Example of setting up a large stack (default is 20k) by kmalloc'ing a larger chunk and assigning it to the thread via the attribute structure.