The Linux Kernel/System/CGroup v2

Introduction Terminology What is cgroup? Basic Operations Mounting nsdelegate favordynmods memory_localevents memory_recursiveprot memory_hugetlb_accounting pids_localevents Organizing Processes and Threads Processes Threads [Un]populated Notification Controlling Controllers Enabling and Disabling Top-down Constraint No Internal Process Constraint Delegation Model of Delegation Delegation Containment Guidelines Organize Once and Control Avoid Name Collisions Resource Distribution Models Weights Limits Protections Allocations Interface Files Format Conventions Core Interface Files cgroup.type cgroup.procs cgroup.threads cgroup.controllers cgroup.subtree_control cgroup.events populated frozen cgroup.max.descendants cgroup.max.depth cgroup.stat nr_descendants nr_dying_descendants nr_subsys_<cgroup_subsys> nr_dying_subsys_<cgroup_subsys> cgroup.freeze cgroup.kill cgroup.pressure irq.pressure Controllers CPU CPU Interface Files cpu.stat cpu.weight cpu.weight.nice cpu.max cpu.max.burst cpu.pressure cpu.uclamp.min cpu.uclamp.max cpu.idle Memory Memory Interface Files memory.current memory.min memory.low memory.high memory.max memory.reclaim memory.peak memory.oom.group memory.events low high max oom oom_kill oom_group_kill memory.events.local memory.stat anon file kernel kernel_stack pagetables sec_pagetables percpu sock vmalloc shmem zswap zswapped file_mapped file_dirty file_writeback swapcached anon_thp file_thp shmem_thp inactive_anon, slab_reclaimable slab_unreclaimable slab workingset_refault_anon workingset_refault_file workingset_activate_anon workingset_activate_file workingset_restore_anon workingset_restore_file workingset_nodereclaim pswpin pswpout pgscan pgsteal pgscan_kswapd pgscan_direct pgscan_khugepaged pgscan_proactive pgsteal_kswapd pgsteal_direct pgsteal_khugepaged pgsteal_proactive pgfault pgmajfault pgrefill pgactivate pgdeactivate pglazyfree pglazyfreed swpin_zero swpout_zero zswpin zswpout zswpwb thp_fault_alloc thp_collapse_alloc thp_swpout thp_swpout_fallback numa_pages_migrated numa_pte_updates numa_hint_faults pgdemote_kswapd pgdemote_direct pgdemote_khugepaged pgdemote_proactive hugetlb memory.numa_stat memory.swap.current memory.swap.high memory.swap.peak memory.swap.max memory.swap.events high max fail memory.zswap.current memory.zswap.max memory.zswap.writeback memory.pressure Usage Guidelines Memory Ownership IO IO Interface Files io.stat io.cost.qos io.cost.model io.weight io.max io.pressure Writeback vm.dirty_background_ratio, vm.dirty_background_bytes, IO Latency How IO Latency Throttling Works IO Latency Interface Files io.latency io.stat depth avg_lat win IO Priority no-change promote-to-rt restrict-to-be idle none-to-rt PID PID Interface Files pids.max pids.current pids.peak pids.events max pids.events.local Cpuset Cpuset Interface Files cpuset.cpus cpuset.cpus.effective cpuset.mems cpuset.mems.effective cpuset.cpus.exclusive cpuset.cpus.exclusive.effective cpuset.cpus.isolated cpuset.cpus.partition Device controller RDMA RDMA Interface Files rdma.max rdma.current DMEM DMEM Interface Files dmem.max, dmem.capacity dmem.current HugeTLB HugeTLB Interface Files hugetlb.<hugepagesize>.current hugetlb.<hugepagesize>.max hugetlb.<hugepagesize>.events max hugetlb.<hugepagesize>.events.local hugetlb.<hugepagesize>.numa_stat Misc Misc Interface Files misc.capacity misc.current misc.peak misc.max misc.events max misc.events.local Migration and Ownership Others perf_event Non-normative information CPU controller root cgroup process behaviour IO controller root cgroup process behaviour Namespace Basics The Root and Views Migration and setns(2) Interaction with Other Namespaces Information on Kernel Programming Filesystem Support for Writeback wbc_init_bio wbc_account_cgroup_owner Deprecated v1 Core Features Issues with v1 and Rationales for v2 Multiple Hierarchies Thread Granularity Competition Between Inner Nodes and Threads Other Interface Issues Controller Issues and Remedies Memory