Patch series implements hugetlb_cgroup reservation usage and limits, which track hugetlb reservations rather than hugetlb memory faulted in. Details of the approach is 1/7.
Changes in v5: - Moved the bulk of the description to the first patch in the series. - Clang formatted the entire series. - Split off 'hugetlb: remove duplicated code' and 'hugetlb: region_chg provides only cache entry' into their own patch series. - Added comments to HUGETLB_RES enum. - Fixed bug in 'hugetlb: disable region_add file_region coalescing' calculating the wrong number of regions_needed in some cases. - Changed sleeps in test to proper conditions. - Misc fixes in test based on shuah@ review.
Changes in v4: - Split up 'hugetlb_cgroup: add accounting for shared mappings' into 4 patches for better isolation and context on the indvidual changes: - hugetlb_cgroup: add accounting for shared mappings - hugetlb: disable region_add file_region coalescing - hugetlb: remove duplicated code - hugetlb: region_chg provides only cache entry - Fixed resv->adds_in_progress accounting. - Retained behavior that region_add never fails, in earlier patchsets region_add could return failure. - Fixed libhugetlbfs failure. - Minor fix to the added tests that was preventing them from running on some environments.
Changes in v3: - Addressed comments of Hillf Danton: - Added docs. - cgroup_files now uses enum. - Various readability improvements. - Addressed comments of Mike Kravetz. - region_* functions no longer coalesce file_region entries in the resv_map. - region_add() and region_chg() refactored to make them much easier to understand and remove duplicated code so this patch doesn't add too much complexity. - Refactored common functionality into helpers.
Changes in v2: - Split the patch into a 5 patch series. - Fixed patch subject.
Mina Almasry (7): hugetlb_cgroup: Add hugetlb_cgroup reservation counter hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations hugetlb_cgroup: add reservation accounting for private mappings hugetlb: disable region_add file_region coalescing hugetlb_cgroup: add accounting for shared mappings hugetlb_cgroup: Add hugetlb_cgroup reservation tests hugetlb_cgroup: Add hugetlb_cgroup reservation docs
.../admin-guide/cgroup-v1/hugetlb.rst | 85 +++- include/linux/hugetlb.h | 31 +- include/linux/hugetlb_cgroup.h | 33 +- mm/hugetlb.c | 423 +++++++++++----- mm/hugetlb_cgroup.c | 190 ++++++-- tools/testing/selftests/vm/.gitignore | 1 + tools/testing/selftests/vm/Makefile | 1 + .../selftests/vm/charge_reserved_hugetlb.sh | 461 ++++++++++++++++++ .../selftests/vm/write_hugetlb_memory.sh | 22 + .../testing/selftests/vm/write_to_hugetlbfs.c | 250 ++++++++++ 10 files changed, 1306 insertions(+), 191 deletions(-) create mode 100755 tools/testing/selftests/vm/charge_reserved_hugetlb.sh create mode 100644 tools/testing/selftests/vm/write_hugetlb_memory.sh create mode 100644 tools/testing/selftests/vm/write_to_hugetlbfs.c
-- 2.23.0.351.gc4317032e6-goog