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Kconfig
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mainmenu "Nautilus AeroKernel Configuration"
menu "Platform"
choice
prompt "Target Selection"
default X86_64_HOST
config X86_64_HOST
bool "x86_64 Host (including Intel Xeon Phi KNL)"
config XEON_PHI
bool "Intel Xeon Phi Accelerator (KNC)"
config HVM_HRT
bool "Hybrid Runtime AeroKernel (HRT for HVM/Multiverse)"
config GEM5
bool "GEM5-compatible x86_64 kernel"
config GEM5_FORCE_APIC_TIMER_CALIBRATION
depends on GEM5
bool "Force APIC timer calibration"
help
Skip detection of APIC bus frequency, and CPU cycles
per tick and simply set them to desired values. Note
that Gem5 gets timers right, but given how slow it is,
it can feel ridiculous in real-time, especially
when used interactively.
DO NOT SET THIS IF YOU WANT ACCURATE SIMULATED TIME
config GEM5_APIC_BUS_FREQ_HZ
depends on GEM5_FORCE_APIC_TIMER_CALIBRATION
default 10000
int "APIC bus frequency (HZ)"
help
Desired APIC bus frequency
The smaller this number is, the more frequent timer interrupts will be.
If it is too small, you'll be in an interrupt storm.
config GEM5_APIC_CYCLES_PER_US
depends on GEM5_FORCE_APIC_TIMER_CALIBRATION
default 10
int "CPU cycles per microsecond"
help
The smaller this number is, the more frequent timer interrupts will be.
If it is too small, you'll be in an interrupt storm.
endchoice
config MAX_CPUS
int "Maximum Number of CPUs"
range 1 2048
default "256"
help
Specifies the maximum number of hardware CPUs supported by Nautilus
For uniprocessor environments, set this to 1
config MAX_IOAPICS
int "Maximum Number of IOAPICS"
range 1 255
default "16"
help
Specifies the maximum number of IOAPICS supported by Nautilus
config HRT_HIHALF_OFFSET
hex "HRT High-half offset"
default 0xffff800000000000
depends on HVM_HRT
help
Sets the fixed virtual-to-physical address mapping for the HRT
config HRT_GPA_MAP_REQ
hex "HRT Max GPA to map"
default 0x200000000
depends on HVM_HRT
help
Sets the default amount of physical memory that the VMM should
attempt to map for the HRT
config HRT_COMM_PAGE
hex "GPA of HRT/HVM communication page"
default 0x1fffff000
depends on HVM_HRT
help
Sets the default page address at which the VMM and HRT will
communicate information
config HVM_INT_VEC
int "HVM/HRT Interrupt vector"
default 255
range 33 255
depends on HVM_HRT
help
Sets the interrupt vector to use for communication between
the VMM and the HRT
choice
prompt "HRT Page Size Request"
depends on HVM_HRT
default HRT_PS_2M
help
Requests a given page size to map the initial page tables
from the VMM
config HRT_PS_512G
bool "512GB Pages"
config HRT_PS_1G
bool "1GB Pages"
config HRT_PS_2M
bool "2MB Pages"
config HRT_PS_4K
bool "4KB Pages"
endchoice
config PALACIOS
bool "Support for creating VMs using Palacios"
depends on X86_64_HOST
default 0
config PALACIOS_DIR
depends on PALACIOS
string "Path to Palacios VMM tree"
default "../palacios"
help
Path to the Palacios VMM build. Palacios must be built for
Nautilus, and both palacios/libv3vee.a and libnautilus.a must exist
config PALACIOS_EMBED_VM_IMG
bool "Embed VM image"
depends on PALACIOS
default 0
config PALACIOS_EMBEDDED_VM_IMG
depends on PALACIOS
string "Path to Palacios VM image to embed"
default "management_vm.img"
help
Path to the image that will be embedded
config PALACIOS_MGMT_VM
bool "Launch embedded VM at boot as Management VM"
depends on PALACIOS
default 0
endmenu
menu "Build"
config USE_NAUT_BUILTINS
bool "Use GCC Built-in Utility Functions"
default y
help
Compiles the Nuatilus kernel with built-in functions
like __builtin_strcpy etc., as opposed to Nautilus
versions, the full set of which may not be supported
config CXX_SUPPORT
bool "Enable C++ support"
default y
help
Compiles the Nautilus kernel with C++ support. Necessary for,
e.g. C++ HRT integration
config TOOLCHAIN_ROOT
string "Toolchain Root"
help
Directory where the intended GCC toolchain, binutils, libraries, grub, etc are installed.
endmenu
menu "Configuration"
config MAX_THREADS
int "Maximum number of threads in system"
default 1024
help
Maximum number of threads in system (or any core) at once
config THREAD_EXIT_KEYCODE
int "Thread Exit Keycode"
range 1 255
default "196"
help
uses a special thread exit keycode
config USE_TICKETLOCKS
bool "Use Ticket/Bakery locks instead of default spin"
default n
help
Uses ticketlocks (similar to Linux impl.) instead of
default spinlocks
config VIRTUAL_CONSOLE_CHARDEV_CONSOLE
bool "Place a virtual console interface on a character device"
default n
help
Starts a virtual console interface on a given character device
This allows interaction with VCs much like the VGA console
does
config VIRTUAL_CONSOLE_CHARDEV_CONSOLE_NAME
string "Character device name to use"
default "serial0"
depends on VIRTUAL_CONSOLE_CHARDEV_CONSOLE
help
The character device port name to use for this console
config VIRTUAL_CONSOLE_SERIAL_MIRROR
bool "Mirror virtual console log output to serial"
default n
help
Writes any log output
traffic to serial port in addition to its
target virtual console
config VIRTUAL_CONSOLE_SERIAL_MIRROR_ALL
bool "Mirror all virtual console output to serial"
default n
depends on VIRTUAL_CONSOLE_SERIAL_MIRROR
help
Writes all printfs, logs, puts, putchars, etc
traffic to serial port in addition to their
target virtual consoles; direct displays
(screen clears, display char, etc) are not
currently mirrored.
menu "Scheduler Options"
config UTILIZATION_LIMIT
int "Utilization limit (%)"
range 0 100
default 99
help
The maximum percent utilization the scheduler will allow
on a core. This gives headroom for the scheduler itself.
config SPORADIC_RESERVATION
int "Sporadic reservation (%)"
range 0 100
default 10
help
The percentage utilization the scheduler will dedicate
to sporadic threads and tasks on each core. Sporadic
tasks that exceed this are not admitted, even if
there is time available.
config APERIODIC_RESERVATION
int "Aperiodic reservation (%)"
range 0 100
default 10
help
The percentage utilization the scheduler will dedicate
to aperiodic threads on each core. Aperiodic threads
can exceed this - they also soak up any time not being
used by RT threads.
config HZ
int "Timer Interrupt Frequency"
range 10 10000
default "10"
help
Specifies the tick rate for timers and aperiodic
scheduling. The reciprical of this number is
the scheduling quantum for aperiodic (but not RT)
threads.
config INTERRUPT_REINJECTION_DELAY_NS
int "Interrupt Reinjection Delay (in ns)"
default "10000"
help
If a timer or kick interrupt occurs when the cpu
is not preemptable, it will be reinjected (as a timer
interrupt) after this delay. The result is that
scheduler-driving interrupts is not lost, just delayed.
config AUTO_REAP
bool "Reap threads automatically"
default n
help
Should core zero periodically reap the global
thread list of dead detached threads? Only core 0
does this.
config AUTO_REAP_PERIOD_MS
depends on AUTO_REAP
int "Reaping Period (ms)"
range 10 10000
default "1000"
help
The target period between reaping the global
thread list of dead detached threads.
config WORK_STEALING
bool "Work stealing"
default n
help
If enabled an idle cpu will attempt to steal
runnable threads from other cpus.
config WORK_STEALING_INTERVAL_MS
depends on WORK_STEALING
int "Work stealing interval (ms)"
range 1 10000
default "10"
help
The target period between work-stealing attempts
by the idle thread. This is in terms of
the amount of time the idle thread itself executes
not the real-
config WORK_STEALING_AMOUNT
depends on WORK_STEALING
int "Work stealing amount"
range 1 100
default "4"
help
The number of threads the idle thread will
attempt to steal every time work stealing is
run.
config TASK_IN_SCHED
bool "Handle tasks of known size in scheduler"
default true
help
When enabled, each cpu's scheduler will execute tasks of
known size when no real-time task would be impeded. This
lifts such tasks to a priority just below real-time threads.
Note that the eager EDF properties of the scheduler are maintained -
if an RT thread is runnable, it will still run in preference
to in-scheduler task execution, no matter how much slack is available.
config TASK_THREAD
bool "Handle tasks in a special thread"
default true;
help
When enabled, each cpu has a thread that consumes tasks.
The thread can run at an arbitrary aperiodic priority.
config TASK_THREAD_PRIORITY
depends on TASK_THREAD
int "Aperiodic priority for task threads"
default 100000000
help
Priority for the task threads. The default here is
the quantum in ns. By adjusting this, you can adjust
how much priority unsized tasks effectively have in the system.
config TASK_IN_IDLE
bool "Handle tasks within idle loop"
default false
help
When enabled, each cpu's idle loop will execute tasks prior
to attempting work stealing.
config TASK_IN_IDLE_NOPREEMPT
depends on TASK_IN_IDLE
bool "Execute tasks within idle with preemption disabled"
default false
help
When enabled, the idle loop executes tasks with preemption
disabled, which can result in priority inversion for
real-time threads. However, with preemption enabled, the idle loop
may start a task, then get preempted. The task is then in
limbo until the idle loop is run again, which may be never
given that it has the lowest possible priority in the
system. The purpose of this option is to choose
which of these behaviors you want if you are executing tasks
in idle loops.
config INTERRUPT_THREAD
bool "Restrict interrupts to special real-time interrupt thread"
default false
help
When enabled, all interrupts, except scheduling-related
interrupts, are ignored except when a special, per-core
interrupt thread is running. The interrupt thread is a
periodic real-time thread. This forces interrupt handlers
to start only at well-constrained points in time.
If interrupt handlers are of bounded, known duration, they
also then finish before well-contrained points in time
(max: end of slice + interrupt duration). The downside
of this mechanism is that interrupts are delayed until
the interrupt thread is run, increasing interrupt latency.
Note that threads can insulate themselves from interrupts
outside of this mechanism, using the interrupt_priority_class
mechanism.
config INTERRUPT_THREAD_PERIOD_US
depends on INTERRUPT_THREAD
int "Period for the interrupt thread (us)"
range 500 10000
default 1000
help
The interrupt thread will run this often
config INTERRUPT_THREAD_SLICE_US
depends on INTERRUPT_THREAD
int "Slice for the interrupt thread (us)"
range 100 5000
default 100
help
The interrupt thread will execute for this long when it runs
config INTERRUPT_THREAD_ALLOW_IDLE
depends on INTERRUPT_THREAD
bool "Also allow interrupts when running idle thread"
default false
help
Enable interrupts while running the idle thread
choice
prompt "Scheduling Model For Aperiodic Threads"
default APERIODIC_ROUND_ROBIN
config APERIODIC_DYNAMIC_QUANTUM
bool "Dynamic, Quantum-based Priority"
help
Aperiodic threads have dynamic priority based on a
fixed priority and their runtime within a scheduling quantum.
Longer runtime means lower priority.
config APERIODIC_DYNAMIC_LIFETIME
bool "Dynamic, Lifetime-based Priority"
help
Aperiodic threads have dynamic priority based on a
fixed priority and their total runtime.
Longer runtime means lower priority.
config APERIODIC_LOTTERY
bool "Lottery scheduling"
help
Aperiodic threads are given a random priority based on
the fixed priorities of all aperiodic threads on the core.
config APERIODIC_ROUND_ROBIN
bool "Round-robin scheduling"
help
Aperiodic threads are scheduled round-robbin
endchoice
endmenu
config REAL_MODE_INTERFACE
bool "Enable the Long->Real interface"
default n
help
Allows long mode code in Nautilus to execute real-mode
software interrupts (e.g., BIOS, VESA, etc)
config DEBUG_REAL_MODE_INTERFACE
bool "Debug Long->Real interface"
default n
depends on REAL_MODE_INTERFACE
help
Adds debugging output for the long->real interface
config REAL_MODE_INTERFACE_SEGMENT
hex "Segment (64K total) used for Long->Real interface"
default 0x8000
depends on REAL_MODE_INTERFACE
help
Segment used for the real-mode interface
The first 32K is reserved for the trampoline
code and data. The second 32K can be used by
code invoking real mode interrupts
config ISOCORE
bool "Enable Isolated Core Execution"
default n
help
Allows us to dedicate a core to the
execution of a function without any
interference from other cores
config DEBUG_ISOCORE
bool "Debug Isolated Core Execution"
default n
depends on ISOCORE
help
Adds debugging output for isolated core execution
The low-level code does not have debugging output
config CACHEPART
bool "Enable cache partitioning"
default n
depends on X86_64_HOST
help
Allows cache partitioning
config CACHEPART_THREAD_DEFAULT_PERCENT
int "Percentage of cache to reserve for default use by threads"
range 5 100
default 20
depends on CACHEPART
help
This portion of the cache will be used by threads that make no special requests
config CACHEPART_INTERRUPT
bool "Enable interrupt partition"
default n
depends on CACHEPART
help
Create special partition for interrupts (otherwise they
use the default thread partition)
config CACHEPART_INTERRUPT_PERCENT
int "Percentage of cache to reserve for use by interrupt handlers"
range 5 100
default 10
depends on CACHEPART_INTERRUPT
help
This portion of the cache that will be used by interrupt handlers
config DEBUG_CACHEPART
bool "Debug cache partitioning"
default n
depends on CACHEPART
help
Adds debugging output for cache partitioning
config TEST_CACHEPART
bool "Add cache partitioning tests"
default n
depends on CACHEPART
help
Adds the tests for for cache partitioning
menu "Garbage Collection Options"
config GARBAGE_COLLECTION
bool "Enable Garbage Collection"
default n
help
If enabled, a conservative garbage collector is
used to garbage collect the kernel/HRT. mallocs() pass to the
GC, frees() are ignored, and mallocs can trigger global GC
WARNING: Garbage collection in Nautilus is a highly experimental feature. If you
don't know if you need this, you do not.
choice
prompt "Select Garbage Collector"
depends on GARBAGE_COLLECTION
default ENABLE_PDSGC
config ENABLE_BDWGC
bool "BDWGC"
default n
depends on GARBAGE_COLLECTION
help
If enabled, the BDWGC garbage colector is used.
WARNING: BDWGC integration in Nautilus is a highly experimental feature. If you
don't know if you need this, you do not.
config ENABLE_PDSGC
bool "PDSGC"
default n
depends on GARBAGE_COLLECTION
help
If enabled, the home-grown PDSGC garbage colector is used.
WARNING: PDSGC integration in Nautilus is a highly experimental feature. If you
don't know if you need this, you do not.
endchoice
config ALIGN_BDWGC
bool "Force allocations in the BDWGC garbage collector to be aligned to their own size"
default n
depends on ENABLE_BDWGC
help
If enabled, BDWGC allocations will be aligned to their own size, as in the buddy system allocator
config DEBUG_BDWGC
bool "Debug the BDWGC garbage collector"
default n
depends on ENABLE_BDWGC
help
If enabled, print debugging output from BDWGC
config EXPLICIT_ONLY_PDSGC
bool "Only use PDSGC explictly"
default n
depends on ENABLE_PDSGC
help
If enabled failing mallocs do *not* trigger gc and frees do
deallocation. PDSGC can then be used to explicitly leak check
or explicitly do garbage collection of leaked data
config DEBUG_PDSGC
bool "Debug the PDSGC garbage collector"
default n
depends on ENABLE_PDSGC
help
If enabled, print debugging output from PDSGC
config TEST_BDWGC
bool "Include the BDWGC garbage collection test suite"
default n
depends on ENABLE_BDWGC
help
Adddes test suite for BDWGC, which can be run from the shell
endmenu
endmenu
menu "Optimizations"
config FPU_SAVE
bool "Save FPU state on all context switches"
default y
help
Compiles the kernel to save FPU state on every context switch.
This is not strictly necessary if processors are not virtualized
(by the HRT).
config KICK_SCHEDULE
bool "Kick cores with IPIs on scheduling events"
default n
help
This will reduce the latency and variance of scheduling events
by kicking the remote CPU with an IPI, causing a scheduling event
to occur immediately, rather than waiting for next timer tick or
current thread to yield.
config HALT_WHILE_IDLE
bool "Halt the CPU when idle"
default n
help
This will cause the CPU to go into a halt in an idle thread when
there is nothing else important to run. Can potentially reduce
memory traffic do to yields(), especially on platforms like the
Xeon Phi.
config THREAD_OPTIMIZE
bool "Optimize threading for performance"
default n
help
Disables paranoid condition checking and optimizes thread functions
for maximum performance.
endmenu
menu Debugging
config DEBUG_INFO
bool "Compile with Debug Symbols"
default n
help
Compiles Nautilus with GCC debugging information. This
is useful for remote debugging with GDB and QEMU/BOCHS.
config DEBUG_PRINTS
bool "Enable Debugging Prints"
default n
help
Compiles the Nautilus kernel with debugging prints
config ENABLE_ASSERTS
bool "Enable Runtime Assertions"
default n
help
This will enable runtime assert statements. If this is
disabled, they will not be generated
config PROFILE
bool "Enable Profiling"
default n
help
Profile select function entries and exits
config DEBUG_PROFILE
bool "Debug Profiling"
default n
depends on PROFILE
help
Turn on debug prints for the profiler subsystem
config SILENCE_UNDEF_ERR
bool "Silence Errors for Undefined Functions"
default n
help
Mutes error prints related to undefined
libc compatibility functions. Useful when
porting applications to HRT model.
config ENABLE_STACK_CHECK
bool "Enable Runtime Stack Overrun Checking"
default n
help
This checks the stack pointer on every thread switch to
make sure that a thread hasn't overrun its allocated
stack
config ENABLE_REMOTE_DEBUGGING
depends on !HVM_HRT
bool "Enable Remote Debugging"
default n
help
This allows remote debugging, currently using GDB. It integrates
a GDB stub that talks (currently) via a serial port using
polled operation. You must also enable the relevant port
in the serial configuration under the device section.
Note that the kernel will halt at startup until the
debugger attaches.
config ATTACH_REMOTE_DEBUGGER_AT_BOOT
depends on ENABLE_REMOTE_DEBUGGING
bool "Attach the remote debugger at boot"
default n
help
Attach the remote debugger as part of the initialization
process at boot, before other CPUs are up
config DEBUG_REMOTE_DEBUGGER
depends on ENABLE_REMOTE_DEBUGGING
bool "Debug Remote Debugger"
default n
help
Turn on debug prints for the remote debugger subsystem
config DEBUG_PAGING
bool "Debug Paging"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for paging subsystem
config DEBUG_BOOTMEM
bool "Debug Bootmem Allocator"
depends on DEBUG_PRINTS
default n
help
Turn on debugging for the boot memory allocator
config DEBUG_BUDDY
bool "Debug Buddy Allocator"
depends on DEBUG_PRINTS
default n
help
Turn on debugging for the buddy allocator
config DEBUG_KMEM
bool "Debug Kernel Memory Allocator"
depends on DEBUG_PRINTS
default n
help
Turn on debugging for the high-level kernel
memory allocator (malloc/free)
config DEBUG_FPU
bool "Debug FPU"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for FPU related code (SIMD,MMX,SSE,etc.)
config DEBUG_SMP
bool "Debug SMP"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for SMP code
config DEBUG_HRT
bool "Debug HRT"
depends on DEBUG_PRINTS && HVM_HRT
default n
help
Turn on debug prints for HRT/HVM code
config DEBUG_SFI
bool "Debug SFI"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for SFI platform firmware code
config DEBUG_CXX
bool "Debug C++"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for C++ initialization/support code
config DEBUG_THREADS
bool "Debug Threads"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for threads
config DEBUG_GROUP
bool "Debug Groups"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for group
config DEBUG_GROUP_BARRIER
bool "Debug Group Barrier"
depends on DEBUG_GROUP
default n
help
Turn on debug prints for group barrier
config DEBUG_SCHED
bool "Debug Scheduler"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for the scheduler
config DEBUG_GROUP_SCHED
bool "Debug Group Scheduling"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for group scheduling
config DEBUG_TIMERS
bool "Debug Timers"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for timer subsystem
config DEBUG_SEMAPHORES
bool "Debug Semaphores"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for semaphores
config DEBUG_MSG_QUEUES
bool "Debug Message Queues"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for message queues
config DEBUG_SYNCH
bool "Debug Synchronization"
depends on DEBUG_PRINTS
default n
help
Turns on debug prints for synchronization functions
(rwlock, condvar)
config DEBUG_BARRIER
bool "Debug Barriers"
depends on DEBUG_PRINTS
default n
help
Turns on debug prints for barriers
config DEBUG_NUMA
bool "Debug NUMA code"
depends on DEBUG_PRINTS
default n
help
Turns on debug prints for NUMA code
config DEBUG_VIRTUAL_CONSOLE
bool "Debug Virtual Console"
default n
help
Turn on debug output for VC
config DEBUG_DEV
bool "Debug Base Device Interface"
default n
help
Turn on debug output for base device interface
config DEBUG_CHARDEV
bool "Debug Character Device Interface"
depends on DEBUG_DEV
default n
help
Turn on debug output for character device interface
config DEBUG_BLKDEV
bool "Debug Block Device Interface"
depends on DEBUG_DEV
default n
help
Turn on debug output for block device interface
config DEBUG_NETDEV
bool "Debug Network Device Interface"
depends on DEBUG_DEV
default n
help
Turn on debug output for network device interface
config DEBUG_FILESYSTEM
bool "Debug Base Filesystem Interface"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for the filesystem interface
config DEBUG_LOADER
bool "Debug loader"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for the loader
config DEBUG_LINKER
bool "Debug linker"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for the dynamic linker
config DEBUG_PMC
bool "Debug performance counters"
depends on DEBUG_PRINTS
default n
help
Turn on debug prints for the performance counter (PMC) subsystem
endmenu
menu "Runtimes"
config LEGION_RT
bool "Legion RT"
depends on CXX_SUPPORT
config LEGION_RT_ROOT
string "Legion RT Root"
depends on LEGION_RT
help
Directory where the intended Legion runtime is installed
config LEGION_RT_DEBUG
bool "Legion RT Deep Debugging"
default n
depends on LEGION_RT
help
Turns on deep debugging prints for legion runtime in Nautilus
config NDPC_RT
bool "NDPC RT"
depends on CXX_SUPPORT
help
Include the NDPC run-time
config NDPC_RT_DEBUG
bool "Debug NDPC RT";
default n
depends on NDPC_RT
help
Debugging output for the NDPC RT
config NDPC_RT_TESTS
bool "Include tests/benchmarks for NDPC RT";
default n
depends on NDPC_RT
help
Include NDPC simple tests
config NESL_RT
bool "NESL RT"
default n
help
Include the NESL run-time (VCODE engine)
config NESL_RT_DEBUG
bool "Debug NESL RT";
default n
depends on NESL_RT
help
Debugging output for the NESL RT
config NESL_RT_TESTS
bool "Include tests/benchmarks for NESL RT";
default n
depends on NESL_RT
help
Include NESL simple tests
config OMP_RT
bool "OpenMP RT (GOMP-compatible)"