disable many ACPI features

Bug #1689372 reported by Kamal Mostafa
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-aws (Ubuntu)
Kamal Mostafa
Nominated for Xenial by Kleber Sacilotto de Souza

Bug Description

Many ACPI features can be disabled, per Colin King's research.

Colin King has demonstrated measurable boot speed improvements (up to 3%)
by disabling many ACPI features not used by cloud kernels. That work also
allows us to unhook additional unused subsystems (Nouveau, gpiolib, pincntrl).
Disk space utilization of the kernel is reduced:
  /boot by ~200KB
  /lib/modules by ~170 Kb

CVE References

Revision history for this message
Kamal Mostafa (kamalmostafa) wrote :

Colin and I have concluded that ACPI_VIDEO cannot be easily disabled in Xenial, but most other unused ACPI subsystems can be.

description: updated
Changed in linux-aws (Ubuntu):
status: In Progress → Fix Committed
tags: added: verification-done-xenial
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (10.6 KiB)

This bug was fixed in the package linux-aws - 4.4.0-1018.27

linux-aws (4.4.0-1018.27) xenial; urgency=low

  * linux-aws: 4.4.0-1018.27 -proposed tracker (LP: #1691184)

  * linux xenial derivatives fail to build (LP: #1691814)
    - [Packaging] Set do_tools_common in common vars
    - [Packaging] Do not build tools-common

  * linux-aws/linux-gke incorrectly producing an empty linux-*-source package-*
    (LP: #1690183)
    - [Packaging] drop linux-aws-source-* package

  * linux-aws/linux-gke incorrectly producing and using linux-*-tools-
    common/linux-*-cloud-tools-common (LP: #1688579)
    - [Config] linux-tools-* linux-cloud-tools-* share -common packages with linux

  * disable many ACPI features (LP: #1689372)
    - [config] AWS: disable assorted ACPI features

  * disable NOUVEAU (LP: #1689373)
    - [config] AWS: disable NOUVEAU

  * disable GPIOLIB, PINCTRL, and all consumers of them (LP: #1689374)
    - [config] AWS: disable INTEL_LPSS, AMD_PLATFORM, PINCTRL
    - [config] AWS: disable GPIOLIB

  [ Ubuntu: 4.4.0-79.100 ]

  * linux: 4.4.0-79.100 -proposed tracker (LP: #1691180)
  * linux-aws/linux-gke incorrectly producing and using linux-*-tools-
    common/linux-*-cloud-tools-common (LP: #1688579)
    - [Config] make linux-tools-common and linux-cloud-tools-common provide linux-
      gke versions
    - [Config] make linux-tools-common and linux-cloud-tools-common provide linux-
      aws versions
    - [Packaging] prevent linux-*-tools-common from being produced from non linux
  * CVE-2017-0605
    - tracing: Use strlcpy() instead of strcpy() in __trace_find_cmdline()
  * i915-bpo crashes on external hdmi input (LP: #1580272)
    - SAUCE: i915_bpo: Silence the warning about watermark entries not changing
  * Kernel panics on Xenial when using cgroups and strict CFS limits
    (LP: #1687512)
    - sched/fair: Initialize throttle_count for new task-groups lazily
    - sched/fair: Do not announce throttled next buddy in dequeue_task_fair()
  * bonding - mlx5 - speed changed to 0 after changing ring size (LP: #1687877)
    - bonding: allow notifications for bond_set_slave_link_state
  * Xenial update to 4.4.67 stable release (LP: #1689296)
    - timerfd: Protect the might cancel mechanism proper
    - Handle mismatched open calls
    - ASoC: intel: Fix PM and non-atomic crash in bytcr drivers
    - ALSA: ppc/awacs: shut up maybe-uninitialized warning
    - drbd: avoid redefinition of BITS_PER_PAGE
    - mtd: avoid stack overflow in MTD CFI code
    - net: tg3: avoid uninitialized variable warning
    - netlink: Allow direct reclaim for fallback allocation
    - IB/qib: rename BITS_PER_PAGE to RVT_BITS_PER_PAGE
    - IB/ehca: fix maybe-uninitialized warnings
    - ext4: require encryption feature for EXT4_IOC_SET_ENCRYPTION_POLICY
    - ext4 crypto: revalidate dentry after adding or removing the key
    - ext4 crypto: use dget_parent() in ext4_d_revalidate()
    - ext4/fscrypto: avoid RCU lookup in d_revalidate
    - nfsd4: minor NFSv2/v3 write decoding cleanup
    - nfsd: stricter decoding of write-like NFSv2/v3 ops
    - dm ioctl: prevent stack leak in dm ioctl call
    - Linux 4.4.67
  * Precis...

Changed in linux-aws (Ubuntu):
status: Fix Committed → Fix Released
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