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--- cgroupsv2 [2019/07/27 19:55] – created rpjday
+++ cgroupsv2 [2019/07/28 15:25] (current) – [STUFF] rpjday
@@ Line 3: / Line 3: @@
 Stuff about cgroups v2.
-===== Files =====
+===== STUFF =====
+  * every process belongs to exactly one cgroup; all threads of a process belong to the same cgroup
+  *
+===== Kernel files =====
 ==== arch/x86/configs/x86_64_defconfig ====
@@ Line 14: / Line 19: @@
 CONFIG_CGROUP_SCHED=y
 </code>
+==== init/Kconfig ====
+<code>
+menuconfig CGROUPS
+        bool "Control Group support"
+        select KERNFS
+        help
+          This option adds support for grouping sets of processes together, for
+          use with process control subsystems such as Cpusets, CFS, memory
+          controls or device isolation.
+          See
+                - Documentation/scheduler/sched-design-CFS.rst  (CFS)
+                - Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation
+                                          and resource control)
+          Say N if unsure.
+</code>
+==== kernel/Makefile ====
+<code>
+obj-$(CONFIG_CGROUPS) += cgroup/
+</code>
+==== kernel/cgroup/ ====
+<code>
+-rw-rw-r--. 1 rpjday rpjday 174723 Jul 22 05:47 cgroup.c
+-rw-rw-r--. 1 rpjday rpjday   8819 May 14 06:14 cgroup-internal.h
+-rw-rw-r--. 1 rpjday rpjday  34559 Jun  1 16:37 cgroup-v1.c
+-rw-rw-r--. 1 rpjday rpjday 100438 Jul 22 05:47 cpuset.c
+-rw-rw-r--. 1 rpjday rpjday   8409 May 14 06:14 debug.c
+-rw-rw-r--. 1 rpjday rpjday   7749 May 14 06:14 freezer.c
+-rw-rw-r--. 1 rpjday rpjday  12686 May 14 06:14 legacy_freezer.c
+-rw-rw-r--. 1 rpjday rpjday    289 May 14 06:14 Makefile
+-rw-rw-r--. 1 rpjday rpjday   3412 Jan 18  2019 namespace.c
+-rw-rw-r--. 1 rpjday rpjday   8958 Jul  8 17:43 pids.c
+-rw-rw-r--. 1 rpjday rpjday  15012 Jul  8 17:43 rdma.c
+-rw-rw-r--. 1 rpjday rpjday  11149 Jun  1 16:37 rstat.c
+</code>
+<code>
+# SPDX-License-Identifier: GPL-2.0
+obj-y := cgroup.o rstat.o namespace.o cgroup-v1.o freezer.o
+obj-$(CONFIG_CGROUP_FREEZER) += legacy_freezer.o
+obj-$(CONFIG_CGROUP_PIDS) += pids.o
+obj-$(CONFIG_CGROUP_RDMA) += rdma.o
+obj-$(CONFIG_CPUSETS) += cpuset.o
+obj-$(CONFIG_CGROUP_DEBUG) += debug.o
+</code>
+===== Mount points =====
+<code>
+$ mount -t cgroup
+cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,xattr,name=systemd)
+cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,cpu,cpuacct)
+cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,pids)
+cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,net_cls,net_prio)
+cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,blkio)
+cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,freezer)
+cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,hugetlb)
+cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,cpuset)
+cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,perf_event)
+cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,memory)
+cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,seclabel,devices)
+$
+</code>
+<code>
+$ mount -t cgroup2
+cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,seclabel,nsdelegate)
+$
+</code>
+===== sysfs implementation =====