How to segregate a section from big file?

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LEARN ABOUT FREEBSD

memcontrol

MEMCONTROL(8)						    BSD System Manager's Manual 					     MEMCONTROL(8)

NAME

     memcontrol -- control system cache behaviour with respect to memory

SYNOPSIS

     memcontrol list [-a]
     memcontrol set -b base -l length -o owner attribute
     memcontrol clear -o owner
     memcontrol clear -b base -l length

DESCRIPTION

     A number of supported system architectures allow the behaviour of the CPU cache to be programmed to behave differently depending on the
     region being written.

     The memcontrol utility provides an interface to this facility, allowing CPU cache behavior to be altered for ranges of system physical mem-
     ory.

     These ranges are typically power-of-2 aligned and sized, however the specific rules governing their layout vary between architectures.  The
     memcontrol utility does not attempt to enforce these rules, however the system will reject any attempt to set an illegal combination.

     list   List range slots.

	    -a	    List all range slots, even those that are inactive.

     set    Set memory range attributes.

	    -b base
		    Memory range base address.

	    -l length
		    Length of memory range in bytes, power of 2.

	    -o owner
		    Text identifier for this setting (7 char max).

	    attribute
		    Attributes applied to this range; combinations of force, uncacheable, write-combine, write-through, write-back, and
		    write-protect.

     clear  Clear memory range attributes.  Ranges may be cleared by owner or by base/length combination.

	    To clear based on ownership:

	    -o owner
		    All ranges with this owner will be cleared.

	    To clear based on the base/length combination:

	    -b base
		    Memory range base address.

	    -l length
		    Length of memory range in bytes, power of 2.

	    Base and length must exactly match an existing range.

SEE ALSO

     mem(4)

BSD
								September 15, 2002							       BSD

Shell Programming and Scripting