> It's a bug in the /proc code. If buffercache pages exceed
> pagecache pages, `pg_size' flips negative.
> There doesn't seem to be any reason to subtract buffermem_pages
> from page_cache_size - they're independent.
I wonder if it's due to the fact that grow_dev_page()
calls find_or_create_page(), but we increment the
buffermem_pages count unconditionally, whether or
not the page was newly created?
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