MADV_DONTNEED is currently disabled for hugetlb mappings. This certainly
makes sense in shared file mappings as the pagecache maintains a reference
to the page and it will never be freed. However, it could be useful to
unmap and free pages in private mappings.
Mike Kravetz (2):
mm: enable MADV_DONTNEED for hugetlb mappings
madvise: use zap_page_range_single for madvise dontneed
Rik van Riel (1):
mm,madvise,hugetlb: fix unexpected data loss with MADV_DONTNEED on
hugetlbfs
include/linux/mm.h | 2 ++
mm/madvise.c | 47 +++++++++++++++++++++++++++++++++++++++++-----
mm/memory.c | 14 +++++++++++---
3 files changed, 55 insertions(+), 8 deletions(-)
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2.25.1