/[hurd]/hurd-l4/doc/vmm.tex
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revision 1.8 by neal, Thu Oct 23 01:22:07 2003 UTC revision 1.9 by neal, Thu Oct 23 12:15:46 2003 UTC
# Line 319  and sharing memory.  Conceptually, conta Line 319  and sharing memory.  Conceptually, conta
319  integers identifying \keyword{virtual frame}s in the physical memory  integers identifying \keyword{virtual frame}s in the physical memory
320  server.  A virtual frame references a physical frame but is not bound  server.  A virtual frame references a physical frame but is not bound
321  to a particular physical frame (this allows the physical memory server  to a particular physical frame (this allows the physical memory server
322  to move the contents of frames around).  Multiple physical frames may  to move the contents of frames around).  Virtual frames are the
323  reference the same physical frame in which case the memory is shared.  sharing mechanism for physical frames.  Although virtual frames may
324  Sharing may be either real, e.g. System V shared memory, or logical,  not be copied, they may be logically copied thereby creating a new
325  e.g. copy on write.  virtual frame with the same underlying physical frame in which case
326    the physical memory is shared.  Sharing may be either real,
327    e.g. System V shared memory, or logical, e.g. copy on write.
328    
329  When a virtual frame is allocated into a container, there may be no  When a virtual frame is allocated into a container, there may be no
330  physical frame associated with it.  The physical memory server  physical frame associated with it.  The physical memory server

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