Hi, Sverd, Could it be that you are using the cgroup_nov1=all kernel option (or include cpu in cgroup_nov1=... bitmask)? What does cat /proc/cmdline show ? Regards, Rami Rosen -----Original Message----- From: cgroups-owner@xxxxxxxxxxxxxxx [mailto:cgroups-owner@xxxxxxxxxxxxxxx] On Behalf Of Sverd Johnsen Sent: Friday, September 02, 2016 12:13 To: cgroups@xxxxxxxxxxxxxxx Subject: Why would cpu cgroup get disabled by the kernel? Hi! I'am on 4.4.19 (arm) and seem to have all requirements for CPU cgroups build into the kernel: # zgrep -P "CGROUP|GROUP|FAIR" /proc/config.gz CONFIG_CGROUPS=y # CONFIG_CGROUP_DEBUG is not set # CONFIG_CGROUP_FREEZER is not set CONFIG_CGROUP_PIDS=y CONFIG_CGROUP_DEVICE=y CONFIG_CGROUP_CPUACCT=y # CONFIG_CGROUP_PERF is not set CONFIG_CGROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y CONFIG_RT_GROUP_SCHED=y CONFIG_BLK_CGROUP=y # CONFIG_DEBUG_BLK_CGROUP is not set # CONFIG_SCHED_AUTOGROUP is not set CONFIG_CFQ_GROUP_IOSCHED=y # CONFIG_NET_CLS_CGROUP is not set # CONFIG_CGROUP_NET_PRIO is not set # CONFIG_CGROUP_NET_CLASSID is not set # CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set # CONFIG_THERMAL_GOV_FAIR_SHARE is not set Other cgroups also work: # findmnt -a TARGET SOURCE FSTYPE OPTIONS |-/sys sysfs sysfs rw,nosuid,nodev,noexec,relatime | |-/sys/kernel/security securityfs securityfs rw,nosuid,nodev,noexec,relatime | |-/sys/fs/cgroup tmpfs tmpfs ro,nosuid,nodev,noexec,mode=755 | | |-/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,release_agent=/usr/lib/systemd/systemd-cgroups-agent,name=systemd | | |-/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices | | |-/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio | | |-/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids | | `-/sys/fs/cgroup/cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuacct However I get this: # dmesg | egrep "cgroup|control group" [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.001242] Disabling cpu control group subsystem [ 0.001263] Initializing cgroup subsys io [ 0.001289] Initializing cgroup subsys devices [ 0.001304] Initializing cgroup subsys pids # column -t /proc/cgroups #subsys_name hierarchy num_cgroups enabled cpu 0 1 0 cpuacct 5 59 1 blkio 3 9 1 devices 2 56 1 pids 4 64 1 Why? really weird. I control the boot process (systemd 231) and nothing there apparently disables it. When I try to mount cpu cgroup manually I just get ENOENT -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n������.����n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
