============== OVERVIEW =========================== Now that many hugetlb helper functions that deal with hugetlb specific flags[1] and hugetlb cgroups[2] are converted to folios, higher level allocation, prep, and freeing functions within hugetlb can also be converted to operate in folios. Patch 1 of this series implements the wrapper functions around setting the compound destructor and compound order for a folio. Besides the user added in patch 1, patch 2 and patch 9 also use these helper functions. Patches 2-10 convert the higher level hugetlb functions to folios. ============== TESTING =========================== LTP: Ran 10 back to back rounds of the LTP hugetlb test suite. Gigantic Huge Pages: Test allocation and freeing via hugeadm commands: hugeadm --pool-pages-min 1GB:10 hugeadm --pool-pages-min 1GB:0 Demote: Demote 1 1GB hugepages to 512 2MB hugepages echo 1 > /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages echo 1 > /sys/kernel/mm/hugepages/hugepages-1048576kB/demote cat /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages # 512 cat /sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages # 0 Rebased on 10/29/2022 mm-unstable [1] https://lore.kernel.org/lkml/20220922154207.1575343-1-sidhartha.kumar@xxxxxxxxxx/ [2] https://lore.kernel.org/linux-mm/20221101223059.460937-1-sidhartha.kumar@xxxxxxxxxx/ v1 -> v2: - fix conflict with "mm,thp,rmap: simplify compound page mapcount handling" v2 -> v3: - v2 contained wrong version of patch 1 v3 -> v4: - change instances of folio_{clear, set}_head() to __folio_{clear, set}_head() - rebase on top of hugetlb: Fix __prep_compound_gigantic_page page flag setting v4 -> v5: - change comment with HPageVmemmapOptimized to hugetlb_vmemmap_optimized per Tarun Sahu - fix Smatch warning in patch 10 by reorganizing alloc_pool_huge_page - fix NULL pointer dereference issue in patch 10 per John Hubbard - use NULL rather than 0 in patch 6 per David Hildenbrand Sidhartha Kumar (10): mm: add folio dtor and order setter functions mm/hugetlb: convert destroy_compound_gigantic_page() to folios mm/hugetlb: convert dissolve_free_huge_page() to folios mm/hugetlb: convert remove_hugetlb_page() to folios mm/hugetlb: convert update_and_free_page() to folios mm/hugetlb: convert add_hugetlb_page() to folios and add hugetlb_cma_folio() mm/hugetlb: convert enqueue_huge_page() to folios mm/hugetlb: convert free_gigantic_page() to folios mm/hugetlb: convert hugetlb prep functions to folios mm/hugetlb: change hugetlb allocation functions to return a folio include/linux/mm.h | 16 ++ mm/hugetlb.c | 409 ++++++++++++++++++++++----------------------- 2 files changed, 219 insertions(+), 206 deletions(-) -- 2.38.1
