On Thu, 2023-09-21 at 15:42 -0700, Mike Kravetz wrote: > On 09/19/23 22:16, riel@xxxxxxxxxxx wrote: > > From: Rik van Riel <riel@xxxxxxxxxxx> > > > > Extend the locking scheme used to protect shared hugetlb mappings > > from truncate vs page fault races, in order to protect private > > hugetlb mappings (with resv_map) against MADV_DONTNEED. > > > > Add a read-write semaphore to the resv_map data structure, and > > use that from the hugetlb_vma_(un)lock_* functions, in preparation > > for closing the race between MADV_DONTNEED and page faults. > > > > Signed-off-by: Rik van Riel <riel@xxxxxxxxxxx> > > --- > > include/linux/hugetlb.h | 6 ++++++ > > mm/hugetlb.c | 36 ++++++++++++++++++++++++++++++++---- > > 2 files changed, 38 insertions(+), 4 deletions(-) > > This looks straight forward. > > However, I ran just this patch through libhugetlbfs test suite and it > hung on > misaligned_offset (2M: 32). > https://github.com/libhugetlbfs/libhugetlbfs/blob/master/tests/misaligned_offset.c Ah, so that's why I couldn't find hugetlbfs tests in the kernel selftests directory. They're in libhugetlbfs. I'll play around with those tests tomorrow. Let me see what's going on. -- All Rights Reversed.
