On Thu, Jan 16, 2025 at 05:19:24PM +0000, Jaegeuk Kim wrote:

quoted

mean a invalidate_inode_pages2_range.  Which is a strange use of the
word.  what are the use cases?  Why is this queued up to a thread and
not done inline?  Why is this in f2fs and not in common code.

The idea is let apps register some file ranges for page donation and admin
recliam such pages all togehter if they expect to see memory pressure soon.
We can rely on LRU, but this is more user-given trigger. I'm not sure whether
there's a need in general, hence, wanted to put it in f2fs first to get more
concrete use-cases beyond this Android case.

Well, that's certainly not a file system feature.  Please build this
as generic infrastucture and send it to the linux-mm list.