This issue appears to be an upstream bug. Would it be possible for you to open an upstream bug report[0]? That will allow the upstream Developers to examine the issue, and may provide a quicker resolution to the bug.
Please follow the instructions on the wiki page[0]. The first step is to email the appropriate mailing list. If no response is received, then a bug may be opened on bugzilla.kernel.org. Once this bug is reported upstream, please add the tag: 'kernel-bug- reported-upstream'. [0] https://wiki.ubuntu.com/Bugs/Upstream/kernel ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged -- 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/1591504 Title: On function __schedule issue. Status in linux package in Ubuntu: Triaged Bug description: On function __schedule have bottleneck efect. Bellow is perf report result: ............................. - 12,61% 12,61% gmain [kernel.kallsyms] [k] __schedule ▒ 0x40f62674c0854803 ▒ __GI___libc_poll ▒ entry_SYSCALL_64_fastpath ▒ sys_poll ▒ do_sys_poll ▒ poll_schedule_timeout ▒ schedule_hrtimeout_range ▒ schedule_hrtimeout_range_clock ▒ schedule ▒ __schedule ....................................... __schedule /proc/kcore │ ↓ je 580 │ mov %gs:0x7e7e9750(%rip),%r14d │ movl $0x1,%gs:0x7e7f5a8d(%rip) │ cmp %r13,%r12 │ ↓ je 755 │ mov %r12,%gs:0x7e7f5a74(%rip) │ mov %r14d,%r14d │ lock bts %r14,0x2d0(%r12) │ mov $0x80000000,%edi │ add 0x40(%r12),%rdi │ movabs $0x77ff80000000,%rax │ cmovb 0x5f059b(%rip),%rax # 0xffffffff81e11010 │ add %rax,%rdi │ mov %rdi,%cr3 │ nop │ nop │2c4: lock btr %r14,0x2d0(%r13) │ nop │ mov 0x330(%r12),%eax 100,00 │ test %eax,%eax │ ↓ je 6d1 │ mov %gs:0x7e7f5a26(%rip),%rax │ mov %rax,%rdi │ or $0x100,%rdi │ cmp %rdi,%rax │ ↓ je 308 .................. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-22-generic 4.4.0-22.40 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: asu 3213 F...m pulseaudio /dev/snd/controlC0: asu 3213 F.... pulseaudio CurrentDesktop: MATE Date: Sat Jun 11 15:29:36 2016 InstallationDate: Installed on 2016-04-29 (42 days ago) InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IwConfig: lo no wireless extensions. enp1s0 no wireless extensions. MachineType: Olidata S.p.A. ALABAMA ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic root=/dev/mapper/192--168--0--108--vg-root ro RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/08/2008 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: S0101 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: To be filled by O.E.M. dmi.board.vendor: To be filled by O.E.M. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: ALABAMA dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: Olidata S.p.A. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1591504/+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
