KernelKarmicKernelConfig
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| The following options require review: 1. CONFIG_STAGING -- this is only enabled in some of our configs 2. CONFIG_RD_LZMA -- this probabally is what we wanted to enabled when talking about LZMA in the session |
Launchpad Entry: kernel-karmic-kernel-config-review
Created:
Contributors:
Packages affected:
Summary
Reviewing the Karmic Kernel config to ensure we remove old and deprecated options and enable new options. Additionally we will make sure we review all the existing options to ensure we don't introduce regressions.orySpec for examples.
Release Note
Something of the following form would be appropriate:
The Kernel packages has had the following changes made to its configuration. FOO This will have impact on the the following classes of users.
Rationale
A regular review at UDS helps to publicise the decisions being made about new and existing config options. This gives interested stake holders a view and and option for input into this process. It serves to produce a permanent record of these decisions.
Implementation
During the session we will review the current configuration at this URL: https://wiki.ubuntu.com/KernelTeam/2.6.30-5-generic-config. Updates will be made documenting any changes and/or relevant reasoning in the comments column.
BoF agenda and discussion
- Review the general configuration options
- Considerations
- flavour differences will be reviewed separately
PulseAudio tweaks:
High PulseAudio latency and other problems may be due to a low HZ rating in the preemptible kernel: https://tango.0pointer.de/pipermail/pulseaudio-discuss/2009-February/003150.html
Summary
The review concentrated on those new config options. Below is a brief summary of the options and the commentary for each. These will be applied to the main list and the kernel.
Option |
Resolution |
Applied |
CONFIG_ANDROID_* |
enabled on i386, disabled on x86_64 and arm [action] |
=y |
CONFIG_BOOTPARAM_HUNG_TASK_PANIC |
is debug, disabled by default |
=n |
CONFIG_CACHEFILES_HISTOGRAM |
is debug, disabled by default |
=n |
CONFIG_CGROUP_MEM_RES_CTLR_SWAP |
disabled by default |
=n |
CONFIG_CONFIG_SECURITY_TOMOYO |
should be enabled due to getting apparmor for free [action] |
*1 =y (i386, amd64, lpia) not available on ARM ?? |
CONFIG_EVENT_TRACER |
debugging, disable |
=n |
CONFIG_EXT3_DEFAULTS_TO_ORDERED |
just enforces historical behaviour, disabled by default |
=n |
CONFIG_FSCACHE_HISTOGRAM |
debugging, disable |
=n |
CONFIG_FSCACHE_STATS |
debugging, disable |
=n |
CONFIG_FTRACE_SYSCALL |
is debug and overhead per syscall + security implications, disabled by default |
=n |
CONFIG_GFS2_FS_LOCKING_DLM |
take default |
=n |
CONFIG_IMA |
disabled |
=n |
CONFIG_IWLWIFI_SPECTRUM_MEASUREMENT |
take default |
=n |
CONFIG_KERNEL_BZIP2 |
should be enabled [action] |
=n *2 |
CONFIG_KERNEL_LZMA |
should be enabled [action] |
=n *2 |
CONFIG_KEXEC_JUMP |
should be enabled for all [action] |
*1 =y (i386, amd64, lpia) |
CONFIG_KMEMTRACE |
is debug, disable |
=n |
CONFIG_LENOVO_SL_LAPTOP |
enabled module |
*1 =m (i386, amd64, lpia) |
CONFIG_MAC80211_RC_DEFAULT_PID |
should be disabled |
*3 |
CONFIG_MAXSMP |
is experimental, disabled |
=n |
CONFIG_MEDIA_TUNER_CUSTOMISE |
take the default, disabled |
=n |
CONFIG_SCSI_MPT2SAS_LOGGING |
is debugging, disabled |
=n |
CONFIG_MTD_PHYSMAP_COMPAT |
disabled, rawflash, most devices have their own stuff anyway |
=n |
CONFIG_NET_DROP_MONITOR |
is experimental, disabled |
=n |
CONFIG_NFS_FSCACHE |
is experimental, disabled |
=n |
CONFIG_PANEL_CHANGE_MESSAGE |
is experimental, disabled |
=n |
CONFIG_PCI_IOV |
TBD, virtualisation of IO space [needs investigation] |
*4 |
CONFIG_PCI_STUB |
TBD [needs investigation] |
*4 |
CONFIG_POHMELFS_CRYPTO |
make a module [action] |
*5 =y |
CONFIG_POWER_TRACER |
debugging power states, disable |
=n |
CONFIG_PREEMPT_RCU |
disable, highly experimental |
=n |
CONFIG_PREEMPT_RCU_TRACE |
disable |
=n |
CONFIG_ROMFS_BACKED_BY_BOTH |
disable |
=n |
CONFIG_ROMFS_BACKED_BY_MTD |
disable |
=n |
CONFIG_SECURITY_TOMOYO |
enabled |
=y |
CONFIG_SERIAL_MAX3100 |
should be modularised [action] |
*1 =m [i386, amd64, lpia] |
CONFIG_STAGING_EXCLUDE_BUILD |
disable |
*5 |
CONFIG_STRIP_ASM_SYMS |
is done in build, leave disabled |
=n |
CONFIG_THINKPAD_ACPI_UNSAFE_LEDS |
leave disabled |
=n |
CONFIG_TRACE_BRANCH_PROFILING |
is debugging, leave disabled |
=n |
CONFIG_TREE_RCU |
disable |
=n |
CONFIG_TREE_RCU_TRACE |
disable |
=n |
CONFIG_USB_GADGET_CI13xxx |
module |
*6 =n |
CONFIG_USB_GADGET_DUMMY_HCD |
module |
*6 =n |
CONFIG_USB_GADGET_IMX |
disable (broken) |
=n |
CONFIG_VIDEO_GO7007 |
modularise [action] |
*5 *1 =m |
CONFIG_WORKQUEUE_TRACER |
is debug, leave disabled |
=n |
Notes:
- options which were modified from the default
- these options were mutually exclusive with KERNEL_GZIP and are unchanged
- this option is enabled on lpia as that platform is setting EMBEDDED
- these options still require investigation
- these options depend on staging being enabled and it is not for lpia or arm
- mutually exclusive with CONFIG_USB_GADGET_DUALSPEED=y so remain disabled
The following options require review:
- CONFIG_STAGING -- this is only enabled in some of our configs
- CONFIG_RD_LZMA -- this probabally is what we wanted to enabled when talking about LZMA in the session
specs/KernelKarmicKernelConfig (last edited 2009-07-17 19:16:28 by 41)