On 10/21/22 16:36, James Houghton wrote: > Enlighten __unmap_hugepage_range to deal with high-granularity mappings. > This doesn't change its API; it still must be called with hugepage > alignment, but it will correctly unmap hugepages that have been mapped > at high granularity. > > The rules for mapcount and refcount here are: > 1. Refcount and mapcount are tracked on the head page. > 2. Each page table mapping into some of an hpage will increase that > hpage's mapcount and refcount by 1. > > Eventually, functionality here can be expanded to allow users to call > MADV_DONTNEED on PAGE_SIZE-aligned sections of a hugepage, but that is > not done here. > > Signed-off-by: James Houghton <jthoughton@xxxxxxxxxx> > --- > include/asm-generic/tlb.h | 6 ++-- > mm/hugetlb.c | 76 +++++++++++++++++++++++++-------------- > 2 files changed, 52 insertions(+), 30 deletions(-) All looks reasonable, nothing stands out. -- Mike Kravetz
