I think that *-lowlatency-* kernels should include CONFIG_LATENCYTOP by default. I agree that *-generic-* kernels do not need that. If administrator has installed lowlatency kernel they clearly are interested in lowest possible latency and Ubuntu should provide tools to figure out where the current bottlenecks are.
Does popcon support querying for combination of lowlatency kernel AND latencytop? Also note that since the CONFIG_LATENCYTOP was dropped, latencytop is practically broken and cannot be used for anything, which could explain its low usage. (I also wonder if the increased RAM usage is *really* a big deal for desktop class machines. Sure, CONFIG_LATENCYTOP may increase RAM usage by 3848 bytes per task but for busy desktop or workstation running around 1000 tasks that will result in increase of less than 4 *MB*. If you're running 1000 tasks today, you probably have at least 4 *GB* of RAM so the difference is less than 0.1%.) -- 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/1655986 Title: lowlatency kernel is lacking support for latencytop Status in linux package in Ubuntu: Won't Fix Bug description: Actual behavior: $ sudo latencytop mount: none is already mounted or /sys/kernel/debug busy Please enable the CONFIG_LATENCYTOP configuration in your kernel. Exiting... $ grep -i latencytop /boot/config-`uname -r` CONFIG_HAVE_LATENCYTOP_SUPPORT=y # CONFIG_LATENCYTOP is not set Expected behavior: # working latencytop and $ grep -i latencytop /boot/config-`uname -r` CONFIG_HAVE_LATENCYTOP_SUPPORT=y CONFIG_LATENCYTOP=y Tested with package linux-image-4.4.0-57-lowlatency. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-lowlatency 4.4.0.59.62 ProcVersionSignature: Ubuntu 4.4.0-57.78-lowlatency 4.4.35 Uname: Linux 4.4.0-57-lowlatency x86_64 ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: mira 2801 F.... pulseaudio CurrentDesktop: MATE Date: Thu Jan 12 16:33:59 2017 EcryptfsInUse: Yes HibernationDevice: #RESUME=UUID=609d4e01-862b-4199-bd45-ad8841f8c8c3 #RESUME=UUID=69fefec2-0a4f-489b-bb6e-62eab3d97735 InstallationDate: Installed on 2009-10-08 (2652 days ago) InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Alpha amd64 (20091008) IwConfig: lo no wireless extensions. eth1 no wireless extensions. MachineType: System manufacturer System Product Name ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-lowlatency root=UUID=23b87e6c-20b4-4242-9489-1599d62abcce ro vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-57-lowlatency N/A linux-backports-modules-4.4.0-57-lowlatency N/A linux-firmware 1.157.6 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-11-14 (59 days ago) dmi.bios.date: 08/20/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1401 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: P8H77-M PRO dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1401:bd08/20/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: System Product Name dmi.product.version: System Version dmi.sys.vendor: System manufacturer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655986/+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
