This is not at all specific to ext2fs, so should be integrated elsewhere.
IRC, freenode, #hurd, 2012-04-22
<Tekk_> is there any particular reason ext2fs takes so much memory? <Tekk_> it beats everything on my system hands down at 100 MB <youpi> ext2fs contains the page cache <youpi> so it's no wonder it takes memory <youpi> it's all the mapped files <Tekk_> any way I can cut down on that? <Tekk_> my system only has 512 meg :/ <youpi> gnumach is supposed to automatically cut it down as needed <youpi> what is the actual symptom that you see? <Tekk_> youpi: 360 MB of memory usage when I'm doing nothing <Tekk_> oh, is it just intelligent enough to cut down when I'm using more memory? <youpi> Tekk_: yes <Tekk_> awesome. I was worried :)
Actually, ext2fs doesn't contain its page cache (the virtual and physical memory counters do not take the cache size into account). But it must allocate descriptors for the cached content.