I think this is simply turned off in the kernel as the error suggests. grep LATENCY /boot/config*
shows # CONFIG_LATENCYTOP is not set I doubt this will be turned on and your best bet is to recompile your kernel or better perhaps look into newer methods of looking at linux latency issues, this might be a good start - http://www.brendangregg.com/blog/2016-10-27/dtrace-for-linux-2016.html Cheers. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1624885 Title: unable to run latencytop Status in linux package in Ubuntu: Confirmed Bug description: When running latencytop as root: mount: none is already mounted or /sys/kernel/debug busy Please enable the CONFIG_LATENCYTOP configuration in your kernel. Exiting... # uname -a Linux foo 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux # lsb-release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.1 LTS Release: 16.04 Codename: xenial LatencyTop used to work Ubuntu 14.04 distributions. --- AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Sep 18 17:01 seq crw-rw---- 1 root audio 116, 33 Sep 18 17:01 timer AplayDevices: Error: [Errno 2] No such file or directory ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A DistroRelease: Ubuntu 16.04 Ec2AMI: ami-643d4217 Ec2AMIManifest: (unknown) Ec2AvailabilityZone: eu-west-1c Ec2InstanceType: m4.large Ec2Kernel: unavailable Ec2Ramdisk: unavailable IwConfig: Error: [Errno 2] No such file or directory Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: Xen HVM domU Package: linux (not installed) PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic root=UUID=fd4912f3-5c00-4f21-93bb-6027f40d322a ro console=tty1 console=ttyS0 ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16 RelatedPackageVersions: linux-restricted-modules-4.4.0-36-generic N/A linux-backports-modules-4.4.0-36-generic N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory Tags: xenial ec2-images Uname: Linux 4.4.0-36-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 05/12/2016 dmi.bios.vendor: Xen dmi.bios.version: 4.2.amazon dmi.chassis.type: 1 dmi.chassis.vendor: Xen dmi.modalias: dmi:bvnXen:bvr4.2.amazon:bd05/12/2016:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr: dmi.product.name: HVM domU dmi.product.version: 4.2.amazon dmi.sys.vendor: Xen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1624885/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
