Hugh Dickins [off-list ref] wrote:

quoted

(hmm, does lowmem shortage exert
 any pressure on highmem cache these days, I wonder?);

It does, indirectly - when we reclaim an unused inode we also shoot down
all that inode's pagecache.

ISTR that causes some fairly major problems under mem pressure - when we
go to shrink inode cache, it used to sit there for *ages* trying to free
pagecache, particularly if there were a lot of large dirty files. That
was a few months back ... but would anything have fixed that case since then?

M.

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