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The following pictorial provides a simple view of how FREEMAIN works today. This is followed by a new approach. See Original
English (United States)
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Use of System Extension Queue for Freemain (and Freecell),
The following pictorial provides a simple view of how FREEMAIN works
today. This is followed by a new approach. See Original
The new approach basically breaks the Freemain process between between
the transitions from step (1) Invalidate ... to step (2) Get lock ...
When an application issues a Freemain on a virtual address range, then that
range is immediately invalidated, the bookkeeping functions of updating control
blocks, etc., to reflect this release of storage is queued for later processing, and
control is returned to the applications.
The actual processing of this deferred Freemain queue is done
either at: 1) TASK Termination 2) GETMAIN when no more virtual (private) is available 3) Page Fault on an invalidate page resulting from
step (1) of the FREEMAIN process 4) Not at all - in the event of a STARTed task/LOGON(TSO) memory
termination (i.e., any single job memory).
When the queue is to be processed, it is sorted by virtual address. Thus,
actual processing now of the queue provides better recognition of contiguous
free areas, reduced (total) time under the FREEMAIN lock (SALLOC), and fewer
total instructions for processing FREEMAINS.
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