d2753a6d19
Enable tickless support. CONFIG_TICK_ONESHOT and CONFIG_NO_HZ are enabled. itimer_clockevent gets CLOCK_EVT_FEAT_ONESHOT and an implementation of .set_next_event. CONFIG_UML_REAL_TIME_CLOCK goes away because it only makes sense when there is a clock ticking away all the time. timer_handler now just calls do_IRQ once without trying to figure out how many ticks to emulate. The idle loop now needs to turn ticking on and off. Userspace ticks keep happening as usual. However, the userspace loop keep track of when the next wakeup should happen and suppresses process ticks until that happens. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
293 lines
7.7 KiB
Plaintext
293 lines
7.7 KiB
Plaintext
config DEFCONFIG_LIST
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string
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option defconfig_list
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default "arch/$ARCH/defconfig"
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# UML uses the generic IRQ sugsystem
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config GENERIC_HARDIRQS
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bool
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default y
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config UML
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bool
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default y
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config MMU
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bool
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default y
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config NO_IOMEM
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def_bool y
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mainmenu "Linux/Usermode Kernel Configuration"
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config ISA
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bool
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config SBUS
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bool
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config PCI
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bool
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config PCMCIA
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bool
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# Yet to do!
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config TRACE_IRQFLAGS_SUPPORT
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bool
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default n
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config LOCKDEP_SUPPORT
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bool
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default y
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config STACKTRACE_SUPPORT
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bool
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default n
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config GENERIC_CALIBRATE_DELAY
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bool
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default y
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config GENERIC_BUG
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bool
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default y
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depends on BUG
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config GENERIC_TIME
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bool
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default y
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config GENERIC_CLOCKEVENTS
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bool
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default y
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# Used in kernel/irq/manage.c and include/linux/irq.h
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config IRQ_RELEASE_METHOD
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bool
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default y
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menu "UML-specific options"
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config STATIC_LINK
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bool "Force a static link"
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default n
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help
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This option gives you the ability to force a static link of UML.
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Normally, UML is linked as a shared binary. This is inconvenient for
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use in a chroot jail. So, if you intend to run UML inside a chroot,
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you probably want to say Y here.
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Additionally, this option enables using higher memory spaces (up to
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2.75G) for UML.
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source "arch/um/Kconfig.arch"
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source "mm/Kconfig"
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source "kernel/time/Kconfig"
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config LD_SCRIPT_STATIC
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bool
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default y
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depends on STATIC_LINK
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config LD_SCRIPT_DYN
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bool
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default y
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depends on !LD_SCRIPT_STATIC
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config NET
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bool "Networking support"
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help
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Unless you really know what you are doing, you should say Y here.
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The reason is that some programs need kernel networking support even
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when running on a stand-alone machine that isn't connected to any
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other computer. If you are upgrading from an older kernel, you
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should consider updating your networking tools too because changes
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in the kernel and the tools often go hand in hand. The tools are
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contained in the package net-tools, the location and version number
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of which are given in <file:Documentation/Changes>.
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For a general introduction to Linux networking, it is highly
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recommended to read the NET-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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source "fs/Kconfig.binfmt"
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config HOSTFS
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tristate "Host filesystem"
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help
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While the User-Mode Linux port uses its own root file system for
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booting and normal file access, this module lets the UML user
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access files stored on the host. It does not require any
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network connection between the Host and UML. An example use of
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this might be:
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mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
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where /tmp/fromhost is an empty directory inside UML and
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/tmp/umlshare is a directory on the host with files the UML user
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wishes to access.
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For more information, see
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<http://user-mode-linux.sourceforge.net/hostfs.html>.
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If you'd like to be able to work with files stored on the host,
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say Y or M here; otherwise say N.
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config HPPFS
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tristate "HoneyPot ProcFS (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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help
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hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
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entries to be overridden, removed, or fabricated from the host.
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Its purpose is to allow a UML to appear to be a physical machine
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by removing or changing anything in /proc which gives away the
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identity of a UML.
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See <http://user-mode-linux.sf.net/hppfs.html> for more information.
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You only need this if you are setting up a UML honeypot. Otherwise,
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it is safe to say 'N' here.
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config MCONSOLE
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bool "Management console"
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default y
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help
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The user mode linux management console is a low-level interface to
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the kernel, somewhat like the i386 SysRq interface. Since there is
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a full-blown operating system running under every user mode linux
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instance, there is much greater flexibility possible than with the
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SysRq mechanism.
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If you answer 'Y' to this option, to use this feature, you need the
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mconsole client (called uml_mconsole) which is present in CVS in
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2.4.5-9um and later (path /tools/mconsole), and is also in the
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distribution RPM package in 2.4.6 and later.
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It is safe to say 'Y' here.
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config MAGIC_SYSRQ
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bool "Magic SysRq key"
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depends on MCONSOLE
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help
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If you say Y here, you will have some control over the system even
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if the system crashes for example during kernel debugging (e.g., you
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will be able to flush the buffer cache to disk, reboot the system
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immediately or dump some status information). A key for each of the
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possible requests is provided.
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This is the feature normally accomplished by pressing a key
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while holding SysRq (Alt+PrintScreen).
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On UML, this is accomplished by sending a "sysrq" command with
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mconsole, followed by the letter for the requested command.
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The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
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unless you really know what this hack does.
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config SMP
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bool "Symmetric multi-processing support (EXPERIMENTAL)"
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default n
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#SMP_BROKEN is for x86_64.
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depends on EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN))
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help
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This option enables UML SMP support.
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It is NOT related to having a real SMP box. Not directly, at least.
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UML implements virtual SMP by allowing as many processes to run
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simultaneously on the host as there are virtual processors configured.
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Obviously, if the host is a uniprocessor, those processes will
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timeshare, but, inside UML, will appear to be running simultaneously.
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If the host is a multiprocessor, then UML processes may run
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simultaneously, depending on the host scheduler.
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This, however, is supported only in TT mode. So, if you use the SKAS
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patch on your host, switching to TT mode and enabling SMP usually
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gives you worse performances.
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Also, since the support for SMP has been under-developed, there could
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be some bugs being exposed by enabling SMP.
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If you don't know what to do, say N.
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config NR_CPUS
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int "Maximum number of CPUs (2-32)"
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range 2 32
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depends on SMP
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default "32"
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config NEST_LEVEL
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int "Nesting level"
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default "0"
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help
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This is set to the number of layers of UMLs that this UML will be run
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in. Normally, this is zero, meaning that it will run directly on the
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host. Setting it to one will build a UML that can run inside a UML
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that is running on the host. Generally, if you intend this UML to run
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inside another UML, set CONFIG_NEST_LEVEL to one more than the host
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UML.
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config HIGHMEM
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bool "Highmem support (EXPERIMENTAL)"
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depends on !64BIT && EXPERIMENTAL
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default n
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help
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This was used to allow UML to run with big amounts of memory.
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Currently it is unstable, so if unsure say N.
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To use big amounts of memory, it is recommended enable static
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linking (i.e. CONFIG_STATIC_LINK) - this should allow the
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guest to use up to 2.75G of memory.
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config KERNEL_STACK_ORDER
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int "Kernel stack size order"
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default 1 if 64BIT
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range 1 10 if 64BIT
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default 0 if !64BIT
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help
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This option determines the size of UML kernel stacks. They will
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be 1 << order pages. The default is OK unless you're running Valgrind
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on UML, in which case, set this to 3.
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endmenu
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source "init/Kconfig"
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source "drivers/block/Kconfig"
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source "arch/um/Kconfig.char"
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source "drivers/base/Kconfig"
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source "net/Kconfig"
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source "arch/um/Kconfig.net"
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source "drivers/net/Kconfig"
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source "drivers/connector/Kconfig"
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source "fs/Kconfig"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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source "drivers/scsi/Kconfig"
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source "drivers/md/Kconfig"
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if BROKEN
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source "drivers/mtd/Kconfig"
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endif
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#This is just to shut up some Kconfig warnings, so no prompt.
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config INPUT
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bool
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default n
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source "arch/um/Kconfig.debug"
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