This RFC patchset attempts to implement a listed filemap TODO which is changing hugetlb folios to have ->index in PAGE_SIZE. This simplifies many functions within filemap.c as they have to special case hugetlb pages. >From the last RFC[1], Mike pointed out that hugetlb will have to maintain a huge page sized index as well because it is used for the reservation map as well as the hash function for the hugetlb mutex table. This patchset adds new wrappers for hugetlb code to to interact with the page cache. These wrappers calculate a linear page index as this is now what the page cache expects for hugetlb pages as well. This series passes the LTP hugetlb test cases. I will do more testing and performance analysis but wanted to get some early feedback if this approach is acceptable. [1]:https://lore.kernel.org/lkml/20230425012721.GA6696@monkey/T/ Sidhartha Kumar (2): mm/filemap: remove hugetlb special casing in filemap.c mm/hugetlb: add wrapper functions for interactions with page cache fs/hugetlbfs/inode.c | 14 +++++++------- include/linux/hugetlb.h | 21 +++++++++++++++++++-- include/linux/pagemap.h | 8 -------- mm/filemap.c | 36 +++++++++++------------------------- mm/hugetlb.c | 22 +++++++++++++--------- 5 files changed, 50 insertions(+), 51 deletions(-) -- 2.40.1
