Cgroups v2 have been around for a while and many users have fully adopted them, so they never use cgroups v1 features and functionality. Yet they have to "pay" for the cgroup v1 support anyway: 1) the kernel binary contains an unused cgroup v1 code, 2) some code paths have additional checks which are not needed, 3) some common structures like task_struct and mem_cgroup contain unused cgroup v1-specific members. Cgroup memory controller has already separated legacy code to memory-v1.c. So it is time to do the same thing for cpuset controller. This patchset aims to do: 1) moving cgroup v1-specific cpuset code to the new cpuset-v1.c file, 2) putting definitions shared by cpuset.c and cpuset-v1.c into the cpuset-internal.h header, 3) introducing the CONFIG_CPUSETS_V1 config option, turned off by default, 4) making cpuset-v1.c to compile only if CONFIG_CPUSETS_V1 is set. --- V2: - Update to base on the latest cgroup/for-6.12. - Add CONFIG_CPUSETS_V1 for cpuset_memory_pressure_bump. Chen Ridong (11): cgroup/cpuset: introduce cpuset-v1.c cgroup/cpuset: move common code to cpuset-internal.h cgroup/cpuset: move memory_pressure to cpuset-v1.c cgroup/cpuset: move relax_domain_level to cpuset-v1.c cgroup/cpuset: move memory_spread to cpuset-v1.c cgroup/cpuset: add callback_lock helper cgroup/cpuset: move legacy hotplug update to cpuset-v1.c cgroup/cpuset: move validate_change_legacy to cpuset-v1.c cgroup/cpuset: move v1 interfaces to cpuset-v1.c cgroup/cpuset: guard cpuset-v1 code under CONFIG_CPUSETS_V1 cgroup/cpuset: add sefltest for cpuset v1 MAINTAINERS | 3 + include/linux/cpuset.h | 4 + init/Kconfig | 13 + kernel/cgroup/Makefile | 1 + kernel/cgroup/cpuset-internal.h | 305 +++++++ kernel/cgroup/cpuset-v1.c | 563 ++++++++++++ kernel/cgroup/cpuset.c | 850 +----------------- .../selftests/cgroup/test_cpuset_v1_base.sh | 77 ++ 8 files changed, 986 insertions(+), 830 deletions(-) create mode 100644 kernel/cgroup/cpuset-internal.h create mode 100644 kernel/cgroup/cpuset-v1.c create mode 100755 tools/testing/selftests/cgroup/test_cpuset_v1_base.sh -- 2.34.1
