On Tue, Nov 6, 2018 at 2:52 AM Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > > On 11/5/18 3:13 AM, Kuo-Hsin Yang wrote: > > -These are currently used in two places in the kernel: > > +These are currently used in three places in the kernel: > > > > (1) By ramfs to mark the address spaces of its inodes when they are created, > > and this mark remains for the life of the inode. > > @@ -154,6 +154,8 @@ These are currently used in two places in the kernel: > > swapped out; the application must touch the pages manually if it wants to > > ensure they're in memory. > > > > + (3) By the i915 driver to mark pinned address space until it's unpinned. > > At a minimum, I think we owe some documentation here of how to tell > approximately how much memory i915 is consuming with this mechanism. > The debugfs stuff sounds like a halfway reasonable way to approximate > it, although it's imperfect. OK, I will add more comments here.
