On Fri, Jul 08, 2016 at 10:34:54AM +0100, Mel Gorman wrote: > NR_FILE_PAGES is the number of file pages. > NR_FILE_MAPPED is the number of mapped file pages. > NR_ANON_PAGES is the number of mapped anon pages. > > This is unhelpful naming as it's easy to confuse NR_FILE_MAPPED and > NR_ANON_PAGES for mapped pages. This patch renames NR_ANON_PAGES so we > have > > NR_FILE_PAGES is the number of file pages. > NR_FILE_MAPPED is the number of mapped file pages. > NR_ANON_MAPPED is the number of mapped anon pages.
That looks wrong to me. The symmetry is between NR_FILE_PAGES and NR_ANON_PAGES. NR_FILE_MAPPED is merely elaborating on the mapped subset of NR_FILE_PAGES, something which isn't necessary for anon pages as they're always mapped.
