group.of.nepali.translators team mailing list archive

[dann frazier <dann.frazier@xxxxxxxxxxxxx>]

I'm unaware of any systems that support LSE that are also supported by
the hwe-{x,y,z} kernels. I'll therefore mark those as "Won't Fix" for
those releases. If someone is aware of such a system - and can take on
the testing of this change for those releases, we can reconsider.

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => Won't Fix

** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Committed

** Changed in: linux (Ubuntu Yakkety)
       Status: Triaged => Won't Fix

** Changed in: linux (Ubuntu Zesty)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1691614

Title:
  please enable CONFIG_ARM64_LSE_ATOMICS

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Won't Fix
Status in linux source package in Yakkety:
  Won't Fix
Status in linux source package in Zesty:
  Won't Fix

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]
  grep CONFIG_ARM64_LSE_ATOMICS=y /boot/config-$(uname -r)

  [Regression Risk]
  There is a known small performance overhead for < ARMv8.1 arm64 systems (noted in the Kconfig). To mitigate the risk of runtime or build failures, this should be tested on both ARMv8 and >= ARMv8.1 systems, to exercise both code paths.

  [*] https://answers.launchpad.net/~canonical-kernel-
  team/+archive/ubuntu/unstable/+build/8438034

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