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and then change the status of the bug to 'Confirmed'.
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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Xenial)
Status: New => Incomplete
** Changed in: linux (Ubuntu Yakkety)
Status: New => Incomplete
** Changed in: linux (Ubuntu Zesty)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1691614
Title:
please enable CONFIG_ARM64_LSE_ATOMICS
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Incomplete
Status in linux source package in Yakkety:
Incomplete
Status in linux source package in Zesty:
Incomplete
Bug description:
[Impact]
Performance is lowered for ARM >= v8.1 cpus by not taking advantage of the
"Large System Extenstion" atomic instructions they provide.
Note: This config was enabled during xenial development, but was
disabled to workaround a FTBFS[*] due to us not having a new enough
binutils to support it. binutils was later updated in xenial, and
supports these instructions.
[Test Case]
TBD
[Regression Risk]
There is a known small performance overhead for <= ARMv8.1 arm64 systems
(noted in the Kconfig).
[...TBD...]
[*]
https://launchpadlibrarian.net/229977996/buildlog_ubuntu-xenial-arm64.linux_4.4.0-0.5_BUILDING.txt.gz
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