[Gllug] Monotonic increase in "committed" memory - what does it mean?

[John Winters]

I've noticed on my MythTV server that the figure shown by munin for 
"committed" memory increases monotonically for as long as MythTV is 
running, although there doesn't seem to be any increase in actual memory 
use - it doesn't swap or anything like that.

A graph of this can be seen here:

http://munin.sinodun.org.uk/sinodun.org.uk/gandalf.sinodun.org.uk-memory.html

You'll see I've stopped and re-started MythTV this morning which 
produces a sudden decrease in the "committed" line.  What is meant by 
"committed" memory and how could a program cause it to keep going up 
like this?  It doesn't seem to be a normal memory leak because that 
would surely cause an increase in actual memory use, rather than this 
sort of theoretical increase.

TIA,
John
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