Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1591504
Title:
On function __schedule issue.
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