dovecot - Nov 2020 - vsz_limit

Hello

I am looking for help around memory management

1 - How to get the current value of "vsz_limit" from inside a plugin 
(namely https://github.com/grosjo/fts-xapian/ ) , especially for 
indexer-worker

2 - Is there a macro or function in dovecot to get the remaining free 
memory from this vsz value ?

Thank you
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