Hello Since kernel 5.0 blkio is no longer creating the following files: blkio.io_merged blkio.io_merged_recursive blkio.io_queued blkio.io_queued_recursive blkio.io_service_bytes blkio.io_service_bytes_recursive blkio.io_serviced blkio.io_serviced_recursive blkio.io_service_time blkio.io_service_time_recursive blkio.io_wait_time blkio.io_wait_time_recursive blkio.leaf_weight blkio.leaf_weight_device blkio.reset_stats blkio.sectors blkio.sectors_recursive blkio.time blkio.time_recursive blkio.weight blkio.weight_device I’m using the stock kernel config, here’s the relevant options: CONFIG_CGROUPS=y CONFIG_BLK_CGROUP=y # CONFIG_DEBUG_BLK_CGROUP is not set CONFIG_CGROUP_WRITEBACK=y CONFIG_CGROUP_SCHED=y CONFIG_FAIR_GROUP_SCHED=y # CONFIG_RT_GROUP_SCHED is not set CONFIG_CGROUP_PIDS=y CONFIG_CGROUP_RDMA=y CONFIG_CGROUP_FREEZER=y CONFIG_CGROUP_HUGETLB=y CONFIG_CGROUP_DEVICE=y CONFIG_CGROUP_CPUACCT=y CONFIG_CGROUP_PERF=y CONFIG_CGROUP_BPF=y # CONFIG_CGROUP_DEBUG is not set CONFIG_SOCK_CGROUP_DATA=y CONFIG_SCHED_AUTOGROUP=y # CONFIG_BLK_CGROUP_IOLATENCY is not set CONFIG_BFQ_GROUP_IOSCHED=y CONFIG_NETFILTER_XT_MATCH_CGROUP=m CONFIG_NETFILTER_XT_MATCH_DEVGROUP=m CONFIG_NET_CLS_CGROUP=m CONFIG_CGROUP_NET_PRIO=y CONFIG_CGROUP_NET_CLASSID=y # CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set CONFIG_THERMAL_GOV_FAIR_SHARE=y As CFQ was removed in 5.0 CONFIG_CFQ_GROUP_IOSCHED is no longer available. Here’s what’s contained in blkio: # ls -la /sys/fs/cgroup/blkio/ total 0 dr-xr-xr-x 5 root root 0 Mar 21 18:15 . drwxr-xr-x 15 root root 380 Mar 21 17:55 .. --w------- 1 root root 0 Mar 21 18:15 blkio.reset_stats -r--r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.io_service_bytes -r--r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.io_service_bytes_recursive -r--r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.io_serviced -r--r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.io_serviced_recursive -rw-r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.read_bps_device -rw-r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.read_iops_device -rw-r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.write_bps_device -rw-r--r-- 1 root root 0 Mar 21 18:15 blkio.throttle.write_iops_device -rw-r--r-- 1 root root 0 Mar 21 18:15 cgroup.clone_children -rw-r--r-- 1 root root 0 Mar 21 18:15 cgroup.procs -r--r--r-- 1 root root 0 Mar 21 18:15 cgroup.sane_behavior drwxr-xr-x 38 root root 0 Mar 21 18:20 docker -rw-r--r-- 1 root root 0 Mar 21 18:15 notify_on_release -rw-r--r-- 1 root root 0 Mar 21 18:15 release_agent drwxr-xr-x 56 root root 0 Mar 21 18:15 system.slice -rw-r--r-- 1 root root 0 Mar 21 18:15 tasks drwxr-xr-x 2 root root 0 Mar 21 18:15 user.slice Other cgroups seem unaffected: # findmnt -a TARGET SOURCE FSTYPE OPTIONS / /dev/md1 ext4 rw,relatime,errors=remount-ro,stripe=768 |-/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/unified cgroup cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate | | |-/sys/fs/cgroup/systemd cgroup cgroup rw,nosuid,nodev,noexec,relatime,xattr,name=systemd | | |-/sys/fs/cgroup/devices cgroup cgroup rw,nosuid,nodev,noexec,relatime,devices | | |-/sys/fs/cgroup/cpu,cpuacct cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpu,cpuacct | | |-/sys/fs/cgroup/net_cls,net_prio cgroup cgroup rw,nosuid,nodev,noexec,relatime,net_cls,net_prio | | |-/sys/fs/cgroup/cpuset cgroup cgroup rw,nosuid,nodev,noexec,relatime,cpuset | | |-/sys/fs/cgroup/blkio cgroup cgroup rw,nosuid,nodev,noexec,relatime,blkio | | |-/sys/fs/cgroup/perf_event cgroup cgroup rw,nosuid,nodev,noexec,relatime,perf_event | | |-/sys/fs/cgroup/freezer cgroup cgroup rw,nosuid,nodev,noexec,relatime,freezer | | |-/sys/fs/cgroup/rdma cgroup cgroup rw,nosuid,nodev,noexec,relatime,rdma | | |-/sys/fs/cgroup/pids cgroup cgroup rw,nosuid,nodev,noexec,relatime,pids | | |-/sys/fs/cgroup/memory cgroup cgroup rw,nosuid,nodev,noexec,relatime,memory | | `-/sys/fs/cgroup/hugetlb cgroup cgroup rw,nosuid,nodev,noexec,relatime,hugetlb # column -t /proc/cgroups #subsys_name hierarchy num_cgroups enabled cpuset 5 38 1 cpu 3 97 1 cpuacct 3 97 1 blkio 6 94 1 memory 11 154 1 devices 2 94 1 freezer 8 38 1 net_cls 4 38 1 perf_event 7 38 1 net_prio 4 38 1 hugetlb 12 38 1 pids 10 98 1 rdma 9 1 1 Am I missing something obvious, or is there a regression? Best regards, Grant Millar
