• Hugh Dickins's avatar
    [PATCH] mm: rss = file_rss + anon_rss · 4294621f
    Hugh Dickins authored
    
    
    I was lazy when we added anon_rss, and chose to change as few places as
    possible.  So currently each anonymous page has to be counted twice, in rss
    and in anon_rss.  Which won't be so good if those are atomic counts in some
    configurations.
    
    Change that around: keep file_rss and anon_rss separately, and add them
    together (with get_mm_rss macro) when the total is needed - reading two
    atomics is much cheaper than updating two atomics.  And update anon_rss
    upfront, typically in memory.c, not tucked away in page_add_anon_rmap.
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    4294621f
nommu.c 27.9 KB