794543a236
Several people have observed that perhaps LOG_BUF_SHIFT should be in a more obvious place than under DEBUG_KERNEL. Under some circumstances (such as the PARISC architecture), DEBUG_KERNEL can increase kernel size, which is an undesirable trade off for something as trivial as increasing the kernel log buffer size. Instead, move LOG_BUF_SHIFT into "General Setup", so that people are more likely to be able to change it such a circumstance that the default buffer size is insufficient. Signed-off-by: Alistair John Strachan <s0348365@sms.ed.ac.uk> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
649 lines
22 KiB
Plaintext
649 lines
22 KiB
Plaintext
config DEFCONFIG_LIST
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string
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depends on !UML
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option defconfig_list
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default "/lib/modules/$UNAME_RELEASE/.config"
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default "/etc/kernel-config"
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default "/boot/config-$UNAME_RELEASE"
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default "arch/$ARCH/defconfig"
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menu "Code maturity level options"
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config EXPERIMENTAL
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bool "Prompt for development and/or incomplete code/drivers"
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---help---
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Some of the various things that Linux supports (such as network
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drivers, file systems, network protocols, etc.) can be in a state
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of development where the functionality, stability, or the level of
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testing is not yet high enough for general use. This is usually
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known as the "alpha-test" phase among developers. If a feature is
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currently in alpha-test, then the developers usually discourage
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uninformed widespread use of this feature by the general public to
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avoid "Why doesn't this work?" type mail messages. However, active
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testing and use of these systems is welcomed. Just be aware that it
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may not meet the normal level of reliability or it may fail to work
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in some special cases. Detailed bug reports from people familiar
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with the kernel internals are usually welcomed by the developers
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(before submitting bug reports, please read the documents
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<file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
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<file:Documentation/BUG-HUNTING>, and
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<file:Documentation/oops-tracing.txt> in the kernel source).
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This option will also make obsoleted drivers available. These are
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drivers that have been replaced by something else, and/or are
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scheduled to be removed in a future kernel release.
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Unless you intend to help test and develop a feature or driver that
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falls into this category, or you have a situation that requires
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using these features, you should probably say N here, which will
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cause the configurator to present you with fewer choices. If
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you say Y here, you will be offered the choice of using features or
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drivers that are currently considered to be in the alpha-test phase.
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config BROKEN
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bool
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config BROKEN_ON_SMP
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bool
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depends on BROKEN || !SMP
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default y
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config LOCK_KERNEL
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bool
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depends on SMP || PREEMPT
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default y
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config INIT_ENV_ARG_LIMIT
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int
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default 32 if !UML
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default 128 if UML
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help
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Maximum of each of the number of arguments and environment
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variables passed to init from the kernel command line.
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endmenu
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menu "General setup"
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config LOCALVERSION
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string "Local version - append to kernel release"
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help
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Append an extra string to the end of your kernel version.
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This will show up when you type uname, for example.
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The string you set here will be appended after the contents of
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any files with a filename matching localversion* in your
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object and source tree, in that order. Your total string can
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be a maximum of 64 characters.
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config LOCALVERSION_AUTO
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bool "Automatically append version information to the version string"
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default y
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help
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This will try to automatically determine if the current tree is a
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release tree by looking for git tags that belong to the current
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top of tree revision.
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A string of the format -gxxxxxxxx will be added to the localversion
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if a git-based tree is found. The string generated by this will be
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appended after any matching localversion* files, and after the value
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set in CONFIG_LOCALVERSION.
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(The actual string used here is the first eight characters produced
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by running the command:
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$ git rev-parse --verify HEAD
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which is done within the script "scripts/setlocalversion".)
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config SWAP
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bool "Support for paging of anonymous memory (swap)"
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depends on MMU && BLOCK
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default y
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help
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This option allows you to choose whether you want to have support
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for so called swap devices or swap files in your kernel that are
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used to provide more virtual memory than the actual RAM present
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in your computer. If unsure say Y.
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config SYSVIPC
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bool "System V IPC"
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---help---
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Inter Process Communication is a suite of library functions and
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system calls which let processes (running programs) synchronize and
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exchange information. It is generally considered to be a good thing,
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and some programs won't run unless you say Y here. In particular, if
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you want to run the DOS emulator dosemu under Linux (read the
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DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
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you'll need to say Y here.
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You can find documentation about IPC with "info ipc" and also in
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section 6.4 of the Linux Programmer's Guide, available from
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<http://www.tldp.org/guides.html>.
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config IPC_NS
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bool "IPC Namespaces"
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depends on SYSVIPC
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default n
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help
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Support ipc namespaces. This allows containers, i.e. virtual
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environments, to use ipc namespaces to provide different ipc
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objects for different servers. If unsure, say N.
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config SYSVIPC_SYSCTL
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bool
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depends on SYSVIPC
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depends on SYSCTL
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default y
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config POSIX_MQUEUE
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bool "POSIX Message Queues"
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depends on NET && EXPERIMENTAL
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---help---
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POSIX variant of message queues is a part of IPC. In POSIX message
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queues every message has a priority which decides about succession
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of receiving it by a process. If you want to compile and run
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programs written e.g. for Solaris with use of its POSIX message
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queues (functions mq_*) say Y here. To use this feature you will
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also need mqueue library, available from
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<http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
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POSIX message queues are visible as a filesystem called 'mqueue'
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and can be mounted somewhere if you want to do filesystem
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operations on message queues.
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If unsure, say Y.
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config BSD_PROCESS_ACCT
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bool "BSD Process Accounting"
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help
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If you say Y here, a user level program will be able to instruct the
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kernel (via a special system call) to write process accounting
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information to a file: whenever a process exits, information about
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that process will be appended to the file by the kernel. The
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information includes things such as creation time, owning user,
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command name, memory usage, controlling terminal etc. (the complete
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list is in the struct acct in <file:include/linux/acct.h>). It is
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up to the user level program to do useful things with this
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information. This is generally a good idea, so say Y.
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config BSD_PROCESS_ACCT_V3
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bool "BSD Process Accounting version 3 file format"
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depends on BSD_PROCESS_ACCT
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default n
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help
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If you say Y here, the process accounting information is written
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in a new file format that also logs the process IDs of each
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process and it's parent. Note that this file format is incompatible
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with previous v0/v1/v2 file formats, so you will need updated tools
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for processing it. A preliminary version of these tools is available
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at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
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config TASKSTATS
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bool "Export task/process statistics through netlink (EXPERIMENTAL)"
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depends on NET
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default n
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help
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Export selected statistics for tasks/processes through the
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generic netlink interface. Unlike BSD process accounting, the
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statistics are available during the lifetime of tasks/processes as
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responses to commands. Like BSD accounting, they are sent to user
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space on task exit.
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Say N if unsure.
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config TASK_DELAY_ACCT
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bool "Enable per-task delay accounting (EXPERIMENTAL)"
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depends on TASKSTATS
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help
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Collect information on time spent by a task waiting for system
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resources like cpu, synchronous block I/O completion and swapping
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in pages. Such statistics can help in setting a task's priorities
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relative to other tasks for cpu, io, rss limits etc.
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Say N if unsure.
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config TASK_XACCT
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bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
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depends on TASKSTATS
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help
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Collect extended task accounting data and send the data
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to userland for processing over the taskstats interface.
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Say N if unsure.
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config TASK_IO_ACCOUNTING
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bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
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depends on TASK_XACCT
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help
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Collect information on the number of bytes of storage I/O which this
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task has caused.
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Say N if unsure.
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config UTS_NS
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bool "UTS Namespaces"
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default n
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help
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Support uts namespaces. This allows containers, i.e.
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vservers, to use uts namespaces to provide different
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uts info for different servers. If unsure, say N.
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config AUDIT
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bool "Auditing support"
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depends on NET
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help
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Enable auditing infrastructure that can be used with another
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kernel subsystem, such as SELinux (which requires this for
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logging of avc messages output). Does not do system-call
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auditing without CONFIG_AUDITSYSCALL.
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config AUDITSYSCALL
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bool "Enable system-call auditing support"
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depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
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default y if SECURITY_SELINUX
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help
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Enable low-overhead system-call auditing infrastructure that
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can be used independently or with another kernel subsystem,
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such as SELinux. To use audit's filesystem watch feature, please
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ensure that INOTIFY is configured.
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config IKCONFIG
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tristate "Kernel .config support"
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---help---
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This option enables the complete Linux kernel ".config" file
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contents to be saved in the kernel. It provides documentation
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of which kernel options are used in a running kernel or in an
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on-disk kernel. This information can be extracted from the kernel
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image file with the script scripts/extract-ikconfig and used as
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input to rebuild the current kernel or to build another kernel.
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It can also be extracted from a running kernel by reading
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/proc/config.gz if enabled (below).
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config IKCONFIG_PROC
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bool "Enable access to .config through /proc/config.gz"
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depends on IKCONFIG && PROC_FS
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---help---
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This option enables access to the kernel configuration file
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through /proc/config.gz.
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config LOG_BUF_SHIFT
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int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
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range 12 21
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default 17 if S390 || LOCKDEP
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default 16 if X86_NUMAQ || IA64
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default 15 if SMP
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default 14
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help
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Select kernel log buffer size as a power of 2.
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Defaults and Examples:
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17 => 128 KB for S/390
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16 => 64 KB for x86 NUMAQ or IA-64
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15 => 32 KB for SMP
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14 => 16 KB for uniprocessor
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13 => 8 KB
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12 => 4 KB
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config CPUSETS
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bool "Cpuset support"
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depends on SMP
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help
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This option will let you create and manage CPUSETs which
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allow dynamically partitioning a system into sets of CPUs and
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Memory Nodes and assigning tasks to run only within those sets.
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This is primarily useful on large SMP or NUMA systems.
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Say N if unsure.
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config SYSFS_DEPRECATED
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bool "Create deprecated sysfs files"
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default y
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help
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This option creates deprecated symlinks such as the
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"device"-link, the <subsystem>:<name>-link, and the
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"bus"-link. It may also add deprecated key in the
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uevent environment.
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None of these features or values should be used today, as
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they export driver core implementation details to userspace
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or export properties which can't be kept stable across kernel
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releases.
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If enabled, this option will also move any device structures
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that belong to a class, back into the /sys/class heirachy, in
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order to support older versions of udev.
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If you are using a distro that was released in 2006 or later,
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it should be safe to say N here.
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config RELAY
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bool "Kernel->user space relay support (formerly relayfs)"
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help
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This option enables support for relay interface support in
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certain file systems (such as debugfs).
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It is designed to provide an efficient mechanism for tools and
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facilities to relay large amounts of data from kernel space to
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user space.
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If unsure, say N.
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config BLK_DEV_INITRD
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bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
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depends on BROKEN || !FRV
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help
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The initial RAM filesystem is a ramfs which is loaded by the
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boot loader (loadlin or lilo) and that is mounted as root
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before the normal boot procedure. It is typically used to
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load modules needed to mount the "real" root file system,
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etc. See <file:Documentation/initrd.txt> for details.
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If RAM disk support (BLK_DEV_RAM) is also included, this
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also enables initial RAM disk (initrd) support and adds
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15 Kbytes (more on some other architectures) to the kernel size.
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If unsure say Y.
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if BLK_DEV_INITRD
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source "usr/Kconfig"
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endif
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config CC_OPTIMIZE_FOR_SIZE
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bool "Optimize for size (Look out for broken compilers!)"
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default y
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depends on ARM || H8300 || EXPERIMENTAL
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help
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Enabling this option will pass "-Os" instead of "-O2" to gcc
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resulting in a smaller kernel.
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WARNING: some versions of gcc may generate incorrect code with this
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option. If problems are observed, a gcc upgrade may be needed.
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If unsure, say N.
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config SYSCTL
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bool
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menuconfig EMBEDDED
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bool "Configure standard kernel features (for small systems)"
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help
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This option allows certain base kernel options and settings
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to be disabled or tweaked. This is for specialized
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environments which can tolerate a "non-standard" kernel.
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Only use this if you really know what you are doing.
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config UID16
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bool "Enable 16-bit UID system calls" if EMBEDDED
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depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
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default y
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help
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This enables the legacy 16-bit UID syscall wrappers.
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config SYSCTL_SYSCALL
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bool "Sysctl syscall support" if EMBEDDED
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default y
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select SYSCTL
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---help---
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sys_sysctl uses binary paths that have been found challenging
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to properly maintain and use. The interface in /proc/sys
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using paths with ascii names is now the primary path to this
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information.
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Almost nothing using the binary sysctl interface so if you are
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trying to save some space it is probably safe to disable this,
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making your kernel marginally smaller.
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If unsure say Y here.
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config KALLSYMS
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bool "Load all symbols for debugging/ksymoops" if EMBEDDED
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default y
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help
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Say Y here to let the kernel print out symbolic crash information and
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symbolic stack backtraces. This increases the size of the kernel
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somewhat, as all symbols have to be loaded into the kernel image.
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config KALLSYMS_ALL
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bool "Include all symbols in kallsyms"
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depends on DEBUG_KERNEL && KALLSYMS
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help
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Normally kallsyms only contains the symbols of functions, for nicer
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OOPS messages. Some debuggers can use kallsyms for other
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symbols too: say Y here to include all symbols, if you need them
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and you don't care about adding 300k to the size of your kernel.
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Say N.
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config KALLSYMS_EXTRA_PASS
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bool "Do an extra kallsyms pass"
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depends on KALLSYMS
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help
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If kallsyms is not working correctly, the build will fail with
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inconsistent kallsyms data. If that occurs, log a bug report and
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turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
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Always say N here unless you find a bug in kallsyms, which must be
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reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
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you wait for kallsyms to be fixed.
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config HOTPLUG
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bool "Support for hot-pluggable devices" if EMBEDDED
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default y
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help
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This option is provided for the case where no hotplug or uevent
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capabilities is wanted by the kernel. You should only consider
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disabling this option for embedded systems that do not use modules, a
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dynamic /dev tree, or dynamic device discovery. Just say Y.
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config PRINTK
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default y
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bool "Enable support for printk" if EMBEDDED
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help
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This option enables normal printk support. Removing it
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eliminates most of the message strings from the kernel image
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and makes the kernel more or less silent. As this makes it
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very difficult to diagnose system problems, saying N here is
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strongly discouraged.
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config BUG
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bool "BUG() support" if EMBEDDED
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default y
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help
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Disabling this option eliminates support for BUG and WARN, reducing
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the size of your kernel image and potentially quietly ignoring
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numerous fatal conditions. You should only consider disabling this
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option for embedded systems with no facilities for reporting errors.
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Just say Y.
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config ELF_CORE
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default y
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bool "Enable ELF core dumps" if EMBEDDED
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help
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Enable support for generating core dumps. Disabling saves about 4k.
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config BASE_FULL
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default y
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bool "Enable full-sized data structures for core" if EMBEDDED
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help
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Disabling this option reduces the size of miscellaneous core
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kernel data structures. This saves memory on small machines,
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but may reduce performance.
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config FUTEX
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bool "Enable futex support" if EMBEDDED
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default y
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select RT_MUTEXES
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help
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|
Disabling this option will cause the kernel to be built without
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support for "fast userspace mutexes". The resulting kernel may not
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run glibc-based applications correctly.
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config EPOLL
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bool "Enable eventpoll support" if EMBEDDED
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default y
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help
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Disabling this option will cause the kernel to be built without
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support for epoll family of system calls.
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config SHMEM
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bool "Use full shmem filesystem" if EMBEDDED
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default y
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depends on MMU
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help
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The shmem is an internal filesystem used to manage shared memory.
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|
It is backed by swap and manages resource limits. It is also exported
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to userspace as tmpfs if TMPFS is enabled. Disabling this
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option replaces shmem and tmpfs with the much simpler ramfs code,
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which may be appropriate on small systems without swap.
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config VM_EVENT_COUNTERS
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default y
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bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
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help
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VM event counters are needed for event counts to be shown.
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This option allows the disabling of the VM event counters
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on EMBEDDED systems. /proc/vmstat will only show page counts
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if VM event counters are disabled.
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choice
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prompt "Choose SLAB allocator"
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default SLAB
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|
help
|
|
This option allows to select a slab allocator.
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|
|
|
config SLAB
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|
bool "SLAB"
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|
help
|
|
The regular slab allocator that is established and known to work
|
|
well in all environments. It organizes chache hot objects in
|
|
per cpu and per node queues. SLAB is the default choice for
|
|
slab allocator.
|
|
|
|
config SLUB
|
|
depends on EXPERIMENTAL && !ARCH_USES_SLAB_PAGE_STRUCT
|
|
bool "SLUB (Unqueued Allocator)"
|
|
help
|
|
SLUB is a slab allocator that minimizes cache line usage
|
|
instead of managing queues of cached objects (SLAB approach).
|
|
Per cpu caching is realized using slabs of objects instead
|
|
of queues of objects. SLUB can use memory efficiently
|
|
way and has enhanced diagnostics.
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|
|
|
config SLOB
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|
#
|
|
# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work
|
|
# properly.
|
|
#
|
|
depends on EMBEDDED && !SMP && !SPARSEMEM
|
|
bool "SLOB (Simple Allocator)"
|
|
help
|
|
SLOB replaces the SLAB allocator with a drastically simpler
|
|
allocator. SLOB is more space efficient that SLAB but does not
|
|
scale well (single lock for all operations) and is more susceptible
|
|
to fragmentation. SLOB it is a great choice to reduce
|
|
memory usage and code size for embedded systems.
|
|
|
|
endchoice
|
|
|
|
endmenu # General setup
|
|
|
|
config RT_MUTEXES
|
|
boolean
|
|
select PLIST
|
|
|
|
config TINY_SHMEM
|
|
default !SHMEM
|
|
bool
|
|
|
|
config BASE_SMALL
|
|
int
|
|
default 0 if BASE_FULL
|
|
default 1 if !BASE_FULL
|
|
|
|
menu "Loadable module support"
|
|
|
|
config MODULES
|
|
bool "Enable loadable module support"
|
|
help
|
|
Kernel modules are small pieces of compiled code which can
|
|
be inserted in the running kernel, rather than being
|
|
permanently built into the kernel. You use the "modprobe"
|
|
tool to add (and sometimes remove) them. If you say Y here,
|
|
many parts of the kernel can be built as modules (by
|
|
answering M instead of Y where indicated): this is most
|
|
useful for infrequently used options which are not required
|
|
for booting. For more information, see the man pages for
|
|
modprobe, lsmod, modinfo, insmod and rmmod.
|
|
|
|
If you say Y here, you will need to run "make
|
|
modules_install" to put the modules under /lib/modules/
|
|
where modprobe can find them (you may need to be root to do
|
|
this).
|
|
|
|
If unsure, say Y.
|
|
|
|
config MODULE_UNLOAD
|
|
bool "Module unloading"
|
|
depends on MODULES
|
|
help
|
|
Without this option you will not be able to unload any
|
|
modules (note that some modules may not be unloadable
|
|
anyway), which makes your kernel slightly smaller and
|
|
simpler. If unsure, say Y.
|
|
|
|
config MODULE_FORCE_UNLOAD
|
|
bool "Forced module unloading"
|
|
depends on MODULE_UNLOAD && EXPERIMENTAL
|
|
help
|
|
This option allows you to force a module to unload, even if the
|
|
kernel believes it is unsafe: the kernel will remove the module
|
|
without waiting for anyone to stop using it (using the -f option to
|
|
rmmod). This is mainly for kernel developers and desperate users.
|
|
If unsure, say N.
|
|
|
|
config MODVERSIONS
|
|
bool "Module versioning support"
|
|
depends on MODULES
|
|
help
|
|
Usually, you have to use modules compiled with your kernel.
|
|
Saying Y here makes it sometimes possible to use modules
|
|
compiled for different kernels, by adding enough information
|
|
to the modules to (hopefully) spot any changes which would
|
|
make them incompatible with the kernel you are running. If
|
|
unsure, say N.
|
|
|
|
config MODULE_SRCVERSION_ALL
|
|
bool "Source checksum for all modules"
|
|
depends on MODULES
|
|
help
|
|
Modules which contain a MODULE_VERSION get an extra "srcversion"
|
|
field inserted into their modinfo section, which contains a
|
|
sum of the source files which made it. This helps maintainers
|
|
see exactly which source was used to build a module (since
|
|
others sometimes change the module source without updating
|
|
the version). With this option, such a "srcversion" field
|
|
will be created for all modules. If unsure, say N.
|
|
|
|
config KMOD
|
|
bool "Automatic kernel module loading"
|
|
depends on MODULES
|
|
help
|
|
Normally when you have selected some parts of the kernel to
|
|
be created as kernel modules, you must load them (using the
|
|
"modprobe" command) before you can use them. If you say Y
|
|
here, some parts of the kernel will be able to load modules
|
|
automatically: when a part of the kernel needs a module, it
|
|
runs modprobe with the appropriate arguments, thereby
|
|
loading the module if it is available. If unsure, say Y.
|
|
|
|
config STOP_MACHINE
|
|
bool
|
|
default y
|
|
depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
|
|
help
|
|
Need stop_machine() primitive.
|
|
endmenu
|
|
|
|
menu "Block layer"
|
|
source "block/Kconfig"
|
|
endmenu
|