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.
v12:
- Add patch 3 and patch 4 to handle the coexistence of hugetlb_free_vmemmap
and memory_hotplug.memmap_on_memory (David).
- Remove Reviewed-by from Mike in the last parch since it is changed.
v11:
- Collect Reviewed-by from Mike.
- Remove hugetlb_optimize_vmemmap_enabled() check from flush_free_hpage_work().
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 (7):
mm: hugetlb_vmemmap: disable hugetlb_optimize_vmemmap when struct page
crosses page boundaries
mm: hugetlb_vmemmap: use kstrtobool for hugetlb_vmemmap param parsing
mm: memory_hotplug: enumerate all supported section flags
mm: hotplug: introduce SECTION_CANNOT_OPTIMIZE_VMEMMAP
mm: hugetlb_vmemmap: remove hugetlb_optimize_vmemmap_enabled()
sysctl: handle table->maxlen properly for proc_dobool
mm: hugetlb_vmemmap: add hugetlb_optimize_vmemmap sysctl
Documentation/admin-guide/kernel-parameters.txt | 22 +++----
Documentation/admin-guide/sysctl/vm.rst | 38 ++++++++++++
arch/arm64/mm/flush.c | 13 +---
fs/lockd/svc.c | 2 +-
include/linux/kconfig.h | 1 +
include/linux/mmzone.h | 54 +++++++++++++---
include/linux/page-flags.h | 16 +----
kernel/sysctl.c | 22 ++++---
mm/hugetlb_vmemmap.c | 82 ++++++++++++++++++-------
mm/memory_hotplug.c | 7 ++-
mm/sparse.c | 7 +++
11 files changed, 186 insertions(+), 78 deletions(-)
--
2.11.0
