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Date: Mon, 24 Feb 2014 08:18:12 +0100
From: cinap_lenrek@felloff.net
To: 9front@9front.org
Subject: Re: [9front] no image after reclaim
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for some reason, we are unable to reclaim program images.
this could happen when you run a shitload of differnet
binaries and keep them running. if the program is not
running anymore, we should be able to reclaim its image
unless theres some bug.

you can inspect the image cache with acid. run (pid doesnt
matter, litterally type $pid):

acid -k -lkernel $pid

kinit()

send the commands printed, then run:

imagecache()

this prints the image structures cached. ref is the overall
number of references to this structure. when that goes
to zero, the image structure is reclaimed. pgref is the
number of page references to the image. entries with
ref == pgrep should be reclaimable. the algorithm just
scans the page list and frees all the pages for images
that are not running anymore, decrementing ref by pgrep.

run this these acid commands from time to time so we
can see when stuff is piling up.

--
cinap