>> The usual C malloc() keeps track of allocated memory with data just 
>> before each allocated block.

>> As well as I understand it, GETMAIN works similarly.

(snip)
 
>> I believe that there have been some improvements along the way, but 
>> don't know about them.

>  At least since MVS/XA (circa 1982), VSM control information is kept in 
> cell pool extents located in ELSQA. 

In the OS/VS2 days, I had the manuals describing the way OS/360
does things like GETMAIN.   Back when you could almost understand
them without a lot of studying.

-- glen

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