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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1591487
Title:
On funct remove_entity_load_avg issue.
Status in linux package in Ubuntu:
Confirmed
Bug description:
On function remove_entity_load_avg from file http://lxr.free-
electrons.com/source/kernel/sched/fair.c#L2647
http://lxr.free-electrons.com/source/kernel/sched/fair.c#L3000
my processor spent 100 cycles to move nonexistent data on %rbx.
On this funct exist embbeded function with issue .
Bellow isresult
$perf record -e cycles -ag and thern perf report.
remove_entity_load_avg /proc/kcore
│ ▒
│ ▒
│ ▒
│ Disassembly of section load0: ▒
│ ▒
│ ffffffff810bbcb0 <load0>: ▒
│ nop ▒
│ push %rbp ◆
│ mov %rsp,%rbp ▒
│ push %r15 ▒
│ push %r14 ▒
│ push %r13 ▒
│ push %r12 ▒
│ push %rbx ▒
│ mov %rdi,%rbx ▒
│ and $0xfffffffffffffff0,%rsp ▒
│ sub $0x10,%rsp ▒
│ mov 0x150(%rdi),%r13 ▒
│ mov 0x60(%r13),%rdx ▒
│ mov %rdx,%rax ▒
│ sub 0x160(%rdi),%rax ▒
│ ↓ js 1f4 ▒
│ shr $0xa,%rax ▒
│ test %rax,%rax ▒
│ ↓ je 120 ▒
│ mov %rdx,0x160(%rdi) ▒
│ mov 0x174(%rdi),%edx ▒
│ mov %rdx,%rcx ▒
│ add %rax,%rdx ▒
│ cmp $0x3ff,%rdx ▒
│ ↓ jbe 14d ▒
│ mov $0x400,%edx ▒
│ movl $0x0,0x174(%rdi) ▒
│ sub %ecx,%edx ▒
│ sub %rdx,%rax ▒
│ mov %rax,%rdi ▒
│ and $0x3ff,%eax ▒
│ shr $0xa,%rdi ▒
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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 13:12:03 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.
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