This series is based on next-20220428.
This series amis to add hugetlb_optimize_vmemmap sysctl to enable or disable
the feature of optimizing vmemmap pages associated with HugeTLB pages.
v10:
- Collect Reviewed-by from Mike.
- Remove hugetlb_optimize_vmemmap_enabled() check from
hugetlb_optimize_vmemmap_pages() (Mike).
- Add more explanation to Documentation/admin-guide/sysctl/vm.rst.
- Fix cannot disable the feature via hugetlb_optimize_vmemmap sysctl (Mike).
- Update patch 2's commit log (Mike).
v9:
- Go back to v3 since checking the size of struct page at config time is
very complex.
v8:
- Fix compilation (scripts/selinux/mdp/mdp.c) error when
CONFIG_SECURITY_SELINUX is selected.
v7:
- Fix circular dependency issue reported by kernel test robot.
- Introduce CONFIG_HUGETLB_PAGE_HAS_OPTIMIZE_VMEMMAP instead of
STRUCT_PAGE_SIZE_IS_POWER_OF_2.
- Add more comments into vm.rst to explain hugetlb_optimize_vmemmap (Andrew).
- Drop the patch "sysctl: allow to set extra1 to SYSCTL_ONE".
- Add a new patch "use kstrtobool for hugetlb_vmemmap param parsing".
- Reuse static_key's refcount to count the number of HugeTLB pages with
vmemmap pages optimized to simplify the lock scheme.
v6:
- Remove "make syncconfig" from Kbuild.
v5:
- Fix not working properly if one is workig off of a very clean build
reported by Luis Chamberlain.
- Add Suggested-by for Luis Chamberlain.
v4:
- Introduce STRUCT_PAGE_SIZE_IS_POWER_OF_2 inspired by Luis.
v3:
- Add pr_warn_once() (Mike).
- Handle the transition from enabling to disabling (Luis)
v2:
- Fix compilation when !CONFIG_MHP_MEMMAP_ON_MEMORY reported by kernel
test robot <lkp@xxxxxxxxx>.
- Move sysctl code from kernel/sysctl.c to mm/hugetlb_vmemmap.c.
Muchun Song (4):
mm: hugetlb_vmemmap: disable hugetlb_optimize_vmemmap when struct page
crosses page boundaries
mm: memory_hotplug: override memmap_on_memory when
hugetlb_free_vmemmap=on
mm: hugetlb_vmemmap: use kstrtobool for hugetlb_vmemmap param parsing
mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl
Documentation/admin-guide/kernel-parameters.txt | 6 +-
Documentation/admin-guide/sysctl/vm.rst | 39 +++++++++
include/linux/memory_hotplug.h | 9 ++
mm/hugetlb.c | 3 +
mm/hugetlb_vmemmap.c | 105 ++++++++++++++++++++----
mm/memory_hotplug.c | 27 ++++--
6 files changed, 165 insertions(+), 24 deletions(-)
--
2.11.0
