c0d234a474
drivers/serial/Kconfig: It is no longer necessary to restrict Ctrl-C handling to the FLAT build
sched/signal: Add a new configuration option to select signal default actions, separate handling of signal default actions from both task startup logic and from the serial TTY Ctrl-C logic. Add a signal set in the group structure to keep track of what signals have been set to the default action. In dispatching signals in PROTECTED or KERNEL mode, use this signal set to determine if the default signal handler is attached and dispatch the signal in kernel mode for the default actions.
1502 lines
50 KiB
Plaintext
1502 lines
50 KiB
Plaintext
#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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menuconfig DISABLE_OS_API
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bool "Disable NuttX interfaces"
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default y
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---help---
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The following can be used to disable categories of
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APIs supported by the OS. If the compiler supports
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weak functions, then it should not be necessary to
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disable functions unless you want to restrict usage
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of those APIs.
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There are certain dependency relationships in these
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features.
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1) mq_notify logic depends on signals to awaken tasks
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waiting for queues to become full or empty.
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2) pthread_condtimedwait() depends on signals to wake
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up waiting tasks.
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if DISABLE_OS_API
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config DISABLE_POSIX_TIMERS
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bool "Disable POSIX timers"
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default y if DEFAULT_SMALL
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default n if !DEFAULT_SMALL
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config DISABLE_PTHREAD
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bool "Disable pthread support"
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default n
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config DISABLE_SIGNALS
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bool "Disable signal support"
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default n
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config DISABLE_MQUEUE
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bool "Disable POSIX message queue support"
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default n
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config DISABLE_ENVIRON
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bool "Disable environment variable support"
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default y if DEFAULT_SMALL
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default n if !DEFAULT_SMALL
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endif # DISABLE_OS_API
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menu "Clocks and Timers"
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config ARCH_HAVE_TICKLESS
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bool
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config SCHED_TICKLESS
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bool "Support tick-less OS"
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default n
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depends on ARCH_HAVE_TICKLESS
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---help---
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By default, system time is driven by a periodic timer interrupt. An
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alternative configurations is a tick-less configuration in which
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there is no periodic timer interrupt. Instead and interval timer is
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used to schedule the next OS time event. This option selects that
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tick-less OS option. If the tick-less OS is selected, then there are
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additional platform specific interfaces that must be provided as
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defined include/nuttx/arch.h
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if SCHED_TICKLESS
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config SCHED_TICKLESS_ALARM
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bool "Tickless alarm"
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default n
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---help---
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The tickless option can be supported either via a simple interval
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timer (plus elapsed time) or via an alarm. The interval timer allows
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programming events to occur after an interval. With the alarm,
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you can set a time in the future and get an event when that alarm
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goes off. This option selects the use of an alarm.
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The advantage of an alarm is that it avoids some small timing
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errors; the advantage of the use of the interval timer is that
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the hardware requirement may be less.
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config SCHED_TICKLESS_LIMIT_MAX_SLEEP
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bool "Max sleep period (in microseconds)"
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default n
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---help---
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Enables use of the g_oneshot_maxticks variable. This variable is
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initialized by platform-specific logic at runtime to the maximum
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delay that the timer can wait (in configured clock ticks). The
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RTOS tickless logic will then limit all requested delays to this
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value.
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endif
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config USEC_PER_TICK
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int "System timer tick period (microseconds)"
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default 10000 if !SCHED_TICKLESS
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default 100 if SCHED_TICKLESS
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---help---
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In the "normal" configuration where system time is provided by a
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periodic timer interrupt, the default system timer is expected to
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run at 100Hz or USEC_PER_TICK=10000. This setting must be defined
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to inform of NuttX the interval that the processor hardware is
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providing system timer interrupts to the OS.
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If SCHED_TICKLESS is selected, then there are no system timer
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interrupts. In this case, USEC_PER_TICK does not control any timer
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rates. Rather, it only determines the resolution of time reported
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by clock_systimer() and the resolution of times that can be set for
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certain delays including watchdog timers and delayed work. In this
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case there is a trade-off: It is better to have the USEC_PER_TICK as
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low as possible for higher timing resolution. However, the time
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is currently held in 'unsigned int' on some systems, this may be
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16-bits but on most contemporary systems it will be 32-bits. In
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either case, smaller values of USEC_PER_TICK will reduce the range
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of values that delays that can be represented. So the trade-off is
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between range and resolution (you could also modify the code to use
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a 64-bit value if you really want both).
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The default, 100 microseconds, will provide for a range of delays
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up to 120 hours.
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This value should never be less than the underlying resolution of
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the timer. Error may ensue.
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if !SCHED_TICKLESS
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config SYSTEMTICK_EXTCLK
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bool "Use external clock"
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default n
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depends on ARCH_HAVE_EXTCLK
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---help---
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Use external clock for system tick. When enabled, the platform-specific
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logic must start its own timer interrupt to make periodic calls to the
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sched_process_timer() or the functions called within. The purpose is
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to move the scheduling off the processor clock to allow entering low
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power states that would disable that clock.
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endif # !SCHED_TICKLESS
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config SYSTEM_TIME64
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bool "64-bit system clock"
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default n
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---help---
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The system timer is incremented at the rate determined by
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USEC_PER_TICK, typically at 100Hz. The count at any given time is
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then the "uptime" in units of system timer ticks. By default, the
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system time is 32-bits wide. Those defaults provide a range of about
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497 days which is probably a sufficient range for "uptime".
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However, if the system timer rate is significantly higher than 100Hz
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and/or if a very long "uptime" is required, then this option can be
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selected to support a 64-bit wide timer.
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config CLOCK_MONOTONIC
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bool "Support CLOCK_MONOTONIC"
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default n
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---help---
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CLOCK_MONOTONIC is an optional standard POSIX clock. Unlike
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CLOCK_REALTIME which can move forward and backward when the
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time-of-day changes, CLOCK_MONOTONIC is the elapsed time since some
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arbitrary point in the post (the system start-up time for NuttX)
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and, hence, is always monotonically increasing. CLOCK_MONOTONIC
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is, hence, the more appropriate clock for determining time
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differences.
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The value of the CLOCK_MONOTONIC clock cannot be set via clock_settime().
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config ARCH_HAVE_TIMEKEEPING
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bool
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default n
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config CLOCK_TIMEKEEPING
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bool "Support timekeeping algorithms"
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default n
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depends on EXPERIMENTAL && ARCH_HAVE_TIMEKEEPING
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---help---
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CLOCK_TIMEKEEPING enables experimental time management algorithms.
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config JULIAN_TIME
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bool "Enables Julian time conversions"
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default n
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---help---
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Enables Julian time conversions
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config START_YEAR
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int "Start year"
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default 2018
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range 1970 2106
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---help---
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NuttX uses an unsigned 32-bit integer for time_t which provides a
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range from 1970 to 2106.
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config START_MONTH
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int "Start month"
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default 1
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range 1 12
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config START_DAY
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int "Start day"
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default 1
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range 1 31
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config MAX_WDOGPARMS
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int "Maximum number of watchdog parameters"
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default 4
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---help---
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Maximum number of parameters that can be passed to a watchdog handler
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config PREALLOC_WDOGS
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int "Number of pre-allocated watchdog timers"
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default 32
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---help---
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The number of pre-allocated watchdog structures. The system manages
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a pool of preallocated watchdog structures to minimize dynamic
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|
allocations. Dynamic allocations will still be made if this pool is
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exhausted. You will, however, get better performance and memory
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usage if this value is tuned to minimize such allocations.
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config WDOG_INTRESERVE
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int "Watchdog structures reserved for interrupt handlers"
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default 4
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---help---
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Watchdog structures may be allocated from normal task and also from
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interrupt handlers. Interrupt handlers, however, can only use pre-
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allocated watchdog timer. So, in order to keep normal task
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allocations from exhausting all watchdog structures, a small number
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of pre-allocated watchdog timers must be reserved for exclusive use
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by interrupt handler. This setting determines that number of
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reserved watchdogs.
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config PREALLOC_TIMERS
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int "Number of pre-allocated POSIX timers"
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default 8
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---help---
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The number of pre-allocated POSIX timer structures. The system manages a
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pool of preallocated timer structures to minimize dynamic allocations. Set to
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zero for all dynamic allocations.
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endmenu # Clocks and Timers
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menu "Tasks and Scheduling"
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config SPINLOCK
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bool "Support Spinlocks"
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default n
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---help---
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Enables suppport for spinlocks. Spinlocks are current used only for
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SMP suppport.
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config SPINLOCK_IRQ
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bool "Support Spinlocks with IRQ control"
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default n
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depends on ARCH_GLOBAL_IRQDISABLE
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---help---
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Enables suppport for spinlocks with IRQ control. This feature can be
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used to protect data in SMP mode.
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config IRQCHAIN
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bool "Enable multi handler sharing a IRQ"
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default n
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---help---
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Enable support for IRQCHAIN.
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if IRQCHAIN
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config PREALLOC_IRQCHAIN
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int "Number of pre-allocated irq chains"
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default 8
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---help---
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The number of pre-allocated irq chain structures. The system manages
|
|
a pool of preallocated irq chain structures to minimize dynamic
|
|
allocations. You will, however, get better performance and memory
|
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usage if this value is tuned to minimize such allocations.
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endif # IRQCHAIN
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config SMP
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bool "Symmetric Multi-Processing (SMP)"
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default n
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depends on ARCH_HAVE_MULTICPU
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select SPINLOCK
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---help---
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Enables support for Symmetric Multi-Processing (SMP) on a multi-CPU
|
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platform.
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if SMP
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config SMP_NCPUS
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int "Number of CPUs"
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default 4
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range 1 32 if DEBUG_FEATURES
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range 2 32 if !DEBUG_FEATURES
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---help---
|
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This value identifies the number of CPUs supported by the processor
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that will be used for SMP.
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If CONFIG_DEBUG_FEATURES is enabled, then the value one is permitted
|
|
for CONFIG_SMP_NCPUS. This is not normally a valid setting for an
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SMP configuration. However, running the SMP logic in a single CPU
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configuration is useful during certain testing.
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config SMP_IDLETHREAD_STACKSIZE
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int "CPU IDLE stack size"
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default 2048
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---help---
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Each CPU will have its own IDLE task. System initialization occurs
|
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on CPU0 and uses CONFIG_IDLETHREAD_STACKSIZE which will probably be
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larger than is generally needed. This setting provides the stack
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size for the IDLE task on CPUS 1 through (CONFIG_SMP_NCPUS-1).
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endif # SMP
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choice
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prompt "Initialization Task"
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default INIT_ENTRYPOINT if !BUILD_KERNEL
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default INIT_FILEPATH if BUILD_KERNEL && !BINFMT_DISABLE
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default INIT_NONE if BUILD_KERNEL && BINFMT_DISABLE
|
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config INIT_NONE
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bool "None"
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config INIT_ENTRYPOINT
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bool "Via application entry point"
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depends on !BUILD_KERNEL
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config INIT_FILEPATH
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bool "Via executable file"
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depends on !BINFMT_DISABLE
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endchoice # Initialization task
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if INIT_ENTRYPOINT
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config USER_ENTRYPOINT
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string "Application entry point"
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default "main"
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---help---
|
|
The name of the entry point for user applications. For the example
|
|
applications this is of the form 'app_main' where 'app' is the application
|
|
name. If not defined, USER_ENTRYPOINT defaults to "main".
|
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endif # INIT_ENTRYPOINT
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|
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if INIT_FILEPATH
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config USER_INITPATH
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string "Application initialization path"
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default "/bin/init"
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|
---help---
|
|
The name of the entry point for user applications. For the example
|
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applications this is of the form 'app_main' where 'app' is the application
|
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name. If not defined, USER_ENTRYPOINT defaults to "main".
|
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config INIT_SYMTAB
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string "Symbol table"
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default "NULL" if !EXECFUNCS_HAVE_SYMTAB
|
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default EXECFUNCS_SYMTAB_ARRAY if EXECFUNCS_HAVE_SYMTAB
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|
depends on !BUILD_PROTECTED && !BUILD_KERNEL
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---help---
|
|
The name of othe global array that holds the exported symbol table.
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The special string "NULL" may be provided if there is no symbol
|
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table. Quotation marks will be stripped when config.h is generated.
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NOTE: This setting cannot be used in protected or kernel builds.
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Any kernel mode symbols tables would not be usable for resolving
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symbols in user mode executables.
|
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config INIT_NEXPORTS
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string "Symbol table size"
|
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default "0" if !EXECFUNCS_HAVE_SYMTAB
|
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default EXECFUNCS_NSYMBOLS_VAR if EXECFUNCS_HAVE_SYMTAB
|
|
depends on !BUILD_PROTECTED && !BUILD_KERNEL
|
|
---help---
|
|
The size of the symbol table. NOTE that is is logically a numeric
|
|
value but is represent by a string. That allows you to put
|
|
sizeof(something) or a macro or a global variable name for the
|
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symbol table size. Quotation marks will be stripped when config.h
|
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is generated.
|
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|
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NOTE: This setting cannot be used in protected or kernel builds.
|
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Any kernel mode symbols tables would not be usable for resolving
|
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symbols in user mode executables.
|
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|
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menuconfig INIT_MOUNT
|
|
bool "Auto-mount init file system"
|
|
default n
|
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depends on !DISABLE_MOUNTPOINT
|
|
---help---
|
|
In order to use the the initial startup program when CONFIG_INIT_FILEPATH
|
|
is provided, it is necessary to mount the initial file system that
|
|
provides init program. Normally this mount is done in the board-specific
|
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initialization logic. However, if the mount is very simple, it can be
|
|
performed by the OS bring-up logic itself by selecting this option.
|
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|
|
if INIT_MOUNT
|
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config INIT_MOUNT_SOURCE
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string "The block device to mount"
|
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default "/dev/ram0"
|
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|
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config INIT_MOUNT_TARGET
|
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string "Path to the mounted file system"
|
|
default "/bin"
|
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|
|
config INIT_MOUNT_FSTYPE
|
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string "The file system type to mount"
|
|
default "romfs"
|
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|
|
config INIT_MOUNT_FLAGS
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hex "Flags passed to mount"
|
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default 0
|
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config INIT_MOUNT_DATA
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string "Additional data passed to mount"
|
|
default ""
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endif # INIT_MOUNT
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endif # INIT_FILEPATH
|
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|
|
config RR_INTERVAL
|
|
int "Round robin timeslice (MSEC)"
|
|
default 0
|
|
---help---
|
|
The round robin timeslice will be set this number of milliseconds;
|
|
Round roben scheduling (SCHED_RR) is enabled by setting this
|
|
interval to a positive, non-zero value.
|
|
|
|
config SCHED_SPORADIC
|
|
bool "Support sporadic scheduling"
|
|
default n
|
|
---help---
|
|
Build in additional logic to support sporadic scheduling
|
|
(SCHED_SPORADIC).
|
|
|
|
if SCHED_SPORADIC
|
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|
|
config SCHED_SPORADIC_MAXREPL
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int "Maximum number of replenishments"
|
|
default 3
|
|
range 1 255
|
|
---help---
|
|
Controls the size of allocated replenishment structures and, hence,
|
|
also limits the maximum number of replenishments.
|
|
|
|
config SPORADIC_INSTRUMENTATION
|
|
bool "Sporadic scheduler monitor hooks"
|
|
default n
|
|
---help---
|
|
Enables instrumentation in the sporadic scheduler to monitor
|
|
scheduler behavior. If enabled, then the board-specific logic must
|
|
provide the following functions:
|
|
|
|
void arch_sporadic_start(FAR struct tcb_s *tcb);
|
|
void arch_sporadic_lowpriority(FAR struct tcb_s *tcb);
|
|
void arch_sporadic_suspend(FAR struct tcb_s *tcb);
|
|
void arch_sporadic_resume(FAR struct tcb_s *tcb);
|
|
|
|
endif # SCHED_SPORADIC
|
|
|
|
config TASK_NAME_SIZE
|
|
int "Maximum task name size"
|
|
default 31
|
|
---help---
|
|
Spcifies that maximum size of a task name to save in the TCB.
|
|
Useful if scheduler instrumentation is selected. Set to zero to
|
|
disable. Excludes the NUL terminator; the actual allocated size
|
|
willl be TASK_NAME_SIZE + 1. The default of 31 then results in
|
|
a align-able 32-byte allocation.::
|
|
|
|
config MAX_TASKS
|
|
int "Max number of tasks"
|
|
default 32
|
|
---help---
|
|
The maximum number of simultaneously active tasks. This value must be
|
|
a power of two.
|
|
|
|
config SCHED_HAVE_PARENT
|
|
bool "Support parent/child task relationships"
|
|
default n
|
|
---help---
|
|
Remember the ID of the parent task when a new child task is
|
|
created. This support enables some additional features (such as
|
|
SIGCHLD) and modifies the behavior of other interfaces. For
|
|
example, it makes waitpid() more standards complete by restricting
|
|
the waited-for tasks to the children of the caller. Default:
|
|
disabled.
|
|
|
|
config SCHED_CHILD_STATUS
|
|
bool "Retain child exit status"
|
|
default n
|
|
depends on SCHED_HAVE_PARENT
|
|
---help---
|
|
If this option is selected, then the exit status of the child task
|
|
will be retained after the child task exits. This option should be
|
|
selected if you require knowledge of a child process' exit status.
|
|
Without this setting, wait(), waitpid() or waitid() may fail. For
|
|
example, if you do:
|
|
|
|
1) Start child task
|
|
2) Wait for exit status (using wait(), waitpid(), or waitid()).
|
|
|
|
This can fail because the child task may run to completion before
|
|
the wait begins. There is a non-standard work-around in this case:
|
|
The above sequence will work if you disable pre-emption using
|
|
sched_lock() prior to starting the child task, then re-enable pre-
|
|
emption with sched_unlock() after the wait completes. This works
|
|
because the child task is not permitted to run until the wait is in
|
|
place.
|
|
|
|
The standard solution would be to enable SCHED_CHILD_STATUS. In
|
|
this case the exit status of the child task is retained after the
|
|
child exits and the wait will successful obtain the child task's
|
|
exit status whether it is called before the child task exits or not.
|
|
|
|
Warning: If you enable this feature, then your application must
|
|
either (1) take responsibility for reaping the child status with wait(),
|
|
waitpid(), or waitid(), or (2) suppress retention of child status.
|
|
If you do not reap the child status, then you have a memory leak and
|
|
your system will eventually fail.
|
|
|
|
Retention of child status can be suppressed on the parent using logic like:
|
|
|
|
struct sigaction sa;
|
|
|
|
sa.sa_handler = SIG_IGN;
|
|
sa.sa_flags = SA_NOCLDWAIT;
|
|
int ret = sigaction(SIGCHLD, &sa, NULL);
|
|
|
|
if SCHED_CHILD_STATUS
|
|
|
|
config PREALLOC_CHILDSTATUS
|
|
int "Number of pre-allocated child status"
|
|
default 0
|
|
---help---
|
|
To prevent runaway child status allocations and to improve
|
|
allocation performance, child task exit status structures are pre-
|
|
allocated when the system boots. This setting determines the number
|
|
of child status structures that will be pre-allocated. If this
|
|
setting is not defined or if it is defined to be zero then a value
|
|
of 2*MAX_TASKS is used.
|
|
|
|
Note that there cannot be more than MAX_TASKS tasks in total.
|
|
However, the number of child status structures may need to be
|
|
significantly larger because this number includes the maximum number
|
|
of tasks that are running PLUS the number of tasks that have exit'ed
|
|
without having their exit status reaped (via wait(), waitid(), or
|
|
waitpid()).
|
|
|
|
Obviously, if tasks spawn children indefinitely and never have the
|
|
exit status reaped, then you may have a memory leak! If you enable
|
|
the SCHED_CHILD_STATUS feature, then your application must take
|
|
responsibility for either (1) reaping the child status with wait(),
|
|
waitpid(), or waitid() or it must (2) suppress retention of child
|
|
status. Otherwise, your system will eventually fail.
|
|
|
|
Retention of child status can be suppressed on the parent using logic like:
|
|
|
|
struct sigaction sa;
|
|
|
|
sa.sa_handler = SIG_IGN;
|
|
sa.sa_flags = SA_NOCLDWAIT;
|
|
int ret = sigaction(SIGCHLD, &sa, NULL);
|
|
|
|
config DEBUG_CHILDSTATUS
|
|
bool "Enable Child Status Debug Output"
|
|
default n
|
|
depends on SCHED_CHILD_STATUS && DEBUG_FEATURES
|
|
---help---
|
|
Very detailed... I am sure that you do not want this.
|
|
|
|
endif # SCHED_CHILD_STATUS
|
|
|
|
config SCHED_WAITPID
|
|
bool "Enable waitpid() API"
|
|
default n
|
|
---help---
|
|
Enables the waitpid() interface in a default, non-standard mode
|
|
(non-standard in the sense that the waited for PID need not be child
|
|
of the caller). If SCHED_HAVE_PARENT is also defined, then this
|
|
setting will modify the behavior or waitpid() (making more spec
|
|
compliant) and will enable the waitid() and wait() interfaces as
|
|
well.
|
|
|
|
endmenu # Tasks and Scheduling
|
|
|
|
menu "Pthread Options"
|
|
|
|
config NPTHREAD_KEYS
|
|
int "Maximum number of pthread keys"
|
|
default 4 if !DISABLE_PTHREAD
|
|
default 0 if DISABLE_PTHREAD
|
|
---help---
|
|
The number of items of thread-specific data that can be retained
|
|
|
|
if !DISABLE_PTHREAD
|
|
|
|
config PTHREAD_MUTEX_TYPES
|
|
bool "Enable mutex types"
|
|
default n
|
|
---help---
|
|
Set to enable support for recursive and errorcheck mutexes. Enables
|
|
pthread_mutexattr_settype().
|
|
|
|
choice
|
|
prompt "pthread mutex robustness"
|
|
default PTHREAD_MUTEX_ROBUST if !DEFAULT_SMALL
|
|
default PTHREAD_MUTEX_UNSAFE if DEFAULT_SMALL
|
|
|
|
config PTHREAD_MUTEX_ROBUST
|
|
bool "Robust mutexes"
|
|
---help---
|
|
Support only the robust form of the NORMAL mutex.
|
|
|
|
config PTHREAD_MUTEX_UNSAFE
|
|
bool "Traditional unsafe mutexes"
|
|
---help---
|
|
Support only the traditional non-robust form of the NORMAL mutex.
|
|
You should select this option only for backward compatibility with
|
|
software you may be porting or, perhaps, if you are trying to minimize
|
|
footprint.
|
|
|
|
config PTHREAD_MUTEX_BOTH
|
|
bool "Both robust and unsafe mutexes"
|
|
---help---
|
|
Support both forms of NORMAL mutexes.
|
|
|
|
endchoice # pthread mutex robustness
|
|
|
|
choice
|
|
prompt "Default NORMAL mutex robustness"
|
|
default PTHREAD_MUTEX_DEFAULT_ROBUST
|
|
depends on PTHREAD_MUTEX_BOTH
|
|
|
|
config PTHREAD_MUTEX_DEFAULT_ROBUST
|
|
bool "Robust default"
|
|
---help---
|
|
The default is robust NORMAL mutexes (non-standard)
|
|
|
|
config PTHREAD_MUTEX_DEFAULT_UNSAFE
|
|
bool "Unsafe default"
|
|
---help---
|
|
The default is traditional unsafe NORMAL mutexes (standard)
|
|
|
|
endchoice # Default NORMAL mutex robustness
|
|
|
|
config PTHREAD_CLEANUP
|
|
bool "pthread cleanup stack"
|
|
default n
|
|
---help---
|
|
Select to enable support for pthread exit cleanup stacks. This
|
|
enables the interfaces pthread_cleanup_push() and
|
|
pthread_cleanup_pop().
|
|
|
|
config PTHREAD_CLEANUP_STACKSIZE
|
|
int "pthread cleanup stack size"
|
|
default 1
|
|
range 1 32
|
|
depends on PTHREAD_CLEANUP
|
|
---help---
|
|
The maximum number of cleanup actions that may be pushed by
|
|
pthread_clean_push(). This setting will increase the size of EVERY
|
|
pthread task control block by about n * CONFIG_PTHREAD_CLEANUP_STACKSIZE
|
|
where n is the size of a pointer, 2* sizeof(uintptr_t), this would be
|
|
8 for a CPU with 32-bit addressing and 4 for a CPU with 16-bit
|
|
addressing.
|
|
|
|
config CANCELLATION_POINTS
|
|
bool "Cancellation points"
|
|
default n
|
|
---help---
|
|
Enable POSIX cancellation points for pthread_cancel(). If selected,
|
|
cancellation points will also used with the () task_delete() API even if
|
|
pthreads are not enabled.
|
|
|
|
endif # !DISABLE_PTHREAD
|
|
|
|
endmenu # Pthread Options
|
|
|
|
menu "Performance Monitoring"
|
|
|
|
config SCHED_IRQMONITOR
|
|
bool "Enable IRQ monitoring"
|
|
default n
|
|
depends on FS_PROCFS
|
|
---help---
|
|
Enabling counting of interrupts from all interrupt sources. These
|
|
counts will be available in the mounted procfs file systems at the
|
|
top-level file, "irqs".
|
|
|
|
config SCHED_CPULOAD
|
|
bool "Enable CPU load monitoring"
|
|
default n
|
|
select SCHED_CPULOAD_EXTCLK if SCHED_TICKLESS
|
|
---help---
|
|
If this option is selected, the timer interrupt handler will monitor
|
|
if the system is IDLE or busy at the time of that the timer interrupt
|
|
occurs. This is a very coarse measurement, but over a period of time,
|
|
it can very accurately determined the percentage of the time that the
|
|
CPU is IDLE.
|
|
|
|
The statistics collected in this could be used, for example in the
|
|
PROCFS file system to provide CPU load measurements when read.
|
|
|
|
Note that in tickless mode of operation (SCHED_TICKLESS) there is
|
|
no system timer interrupt and CPU load measurements will not be
|
|
possible unless you provide an alternative clock to driver the
|
|
sampling and select SCHED_CPULOAD_EXTCLK.
|
|
|
|
if SCHED_CPULOAD
|
|
|
|
config SCHED_CPULOAD_EXTCLK
|
|
bool "Use external clock"
|
|
default n
|
|
---help---
|
|
The CPU load measurements are determined by sampling the active
|
|
tasks periodically at the occurrence to a timer expiration. By
|
|
default, the system clock is used to do that sampling.
|
|
|
|
There is a serious issue for the accuracy of measurements if the
|
|
system clock is used, however. NuttX threads are often started at
|
|
the time of the system timer expiration. Others may be stopped at
|
|
the time of the system timer expiration (if round-robin time-slicing
|
|
is enabled). Such thread behavior occurs synchronously with the
|
|
system timer and, hence, is not randomly sampled. As a consequence,
|
|
the CPU load attributed to these threads that run synchronously with
|
|
they system timer may be grossly in error.
|
|
|
|
The solution is to use some other clock that runs at a different
|
|
rate and has timer expirations that are asynchronous with the
|
|
system timer. Then truly accurate load measurements can be
|
|
achieved. This option enables use of such an "external" clock. The
|
|
implementation of the clock must be provided by platform-specific
|
|
logic; that platform-specific logic must call the system function
|
|
sched_process_cpuload() at each timer expiration with interrupts
|
|
disabled.
|
|
|
|
if SCHED_CPULOAD_EXTCLK
|
|
|
|
config SCHED_CPULOAD_TICKSPERSEC
|
|
int "External clock rate"
|
|
default 100
|
|
---help---
|
|
If an external clock is used to drive the sampling for the CPU load
|
|
calculations, then this value must be provided. This value provides
|
|
the rate of the external clock interrupts in units of ticks per
|
|
second. The default value of 100 corresponds to a 100Hz clock. NOTE:
|
|
that 100Hz is the default frequency of the system time and, hence,
|
|
the worst possible choice in most cases.
|
|
|
|
choice
|
|
prompt "Select CPU load timer"
|
|
default CPULOAD_ONESHOT
|
|
|
|
config CPULOAD_ONESHOT
|
|
bool "Use Oneshot timer"
|
|
---help---
|
|
Use an MCU-specific oneshot timer as the external clock. The
|
|
oneshot timer must be configured by board specific logic which must
|
|
then call:
|
|
|
|
void sched_oneshot_extclk(FAR struct oneshot_lowerhalf_s *lower);
|
|
|
|
To start the CPU load measurement. See include/nuttx/clock.h
|
|
|
|
NOTE that in this configuration, CONFIG_SCHED_CPULOAD_TICKSPERSEC is
|
|
the sample rate that will be accomplished by programming the oneshot
|
|
time repeatedly. If CPULOAD_ONESHOT_ENTROPY is also selected, then
|
|
the underly frequency driving the oneshot timer must be
|
|
significantly faster than CONFIG_SCHED_CPULOAD_TICKSPERSE to permit
|
|
precise modulation the sample periods.
|
|
|
|
config CPULOAD_PERIOD
|
|
bool "Use Period timer"
|
|
---help---
|
|
Use an MCU-specific period timer as the external clock. The
|
|
period timer must be configured by board specific logic which must
|
|
then call:
|
|
|
|
void sched_period_extclk(FAR struct timer_lowerhalf_s *lower);
|
|
|
|
To start the CPU load measurement. See include/nuttx/clock.h
|
|
|
|
NOTE that in this configuration, CONFIG_SCHED_CPULOAD_TICKSPERSEC is
|
|
the sample rate that will be accomplished by programming the period
|
|
time.
|
|
|
|
endchoice
|
|
|
|
config CPULOAD_ENTROPY
|
|
int "Bits of entropy"
|
|
default 6
|
|
range 0 30
|
|
depends on CPULOAD_ONESHOT
|
|
---help---
|
|
This is the number of bits of entropy that will be applied. The
|
|
oneshot will be set to this interval:
|
|
|
|
CPULOAD_ONESHOT_NOMINAL - (CPULOAD_ONESHOT_ENTROPY / 2) +
|
|
error + nrand(CPULOAD_ONESHOT_ENTROPY)
|
|
|
|
Where
|
|
|
|
CPULOAD_ONESHOT_NOMINAL is the nominal sample interval implied
|
|
by CONFIG_SCHED_CPULOAD_TICKSPERSEC in units of microseconds.
|
|
CPULOAD_ONESHOT_ENTROPY is (1 << CONFIG_CPULOAD_ENTROPY),
|
|
and 'error' is an error value that is retained from interval to
|
|
interval so that although individual intervals are randomized,
|
|
the average will still be CONFIG_SCHED_CPULOAD_TICKSPERSEC.
|
|
|
|
This special value of zero disables entropy.
|
|
|
|
endif # SCHED_CPULOAD_EXTCLK
|
|
|
|
config SCHED_CPULOAD_TIMECONSTANT
|
|
int "CPU load time constant"
|
|
default 2
|
|
---help---
|
|
The accumulated CPU count is divided by two when the accumulated
|
|
tick count exceeds this time constant. This time constant is in
|
|
units of seconds.
|
|
|
|
endif # SCHED_CPULOAD
|
|
|
|
config SCHED_INSTRUMENTATION
|
|
bool "System performance monitor hooks"
|
|
default n
|
|
---help---
|
|
Enables instrumentation in scheduler to monitor system performance.
|
|
If enabled, then the board-specific logic must provide the following
|
|
functions (see include/sched.h):
|
|
|
|
void sched_note_start(FAR struct tcb_s *tcb);
|
|
void sched_note_stop(FAR struct tcb_s *tcb);
|
|
void sched_note_suspend(FAR struct tcb_s *tcb);
|
|
void sched_note_resume(FAR struct tcb_s *tcb);
|
|
|
|
If CONFIG_SMP is enabled, then these additional interfaces are
|
|
expected:
|
|
|
|
void sched_note_cpu_pause(FAR struct tcb_s *tcb, int cpu);
|
|
void sched_note_cpu_paused(FAR struct tcb_s *tcb);
|
|
void sched_note_cpu_resume(FAR struct tcb_s *tcb, int cpu);
|
|
void sched_note_cpu_resumed(FAR struct tcb_s *tcb);
|
|
|
|
NOTE: These are internal OS interfaces and are called at at very
|
|
critical locations in the OS. There is very little that can be
|
|
done in these interfaces. For example, normal devices may not be
|
|
used; syslog output cannot be performed.
|
|
|
|
An option is to use SCHED_INSTRUMENTATION_BUFFER below.
|
|
|
|
if SCHED_INSTRUMENTATION
|
|
|
|
config SCHED_INSTRUMENTATION_CPUSET
|
|
hex "CPU bit set"
|
|
default 0xffff
|
|
depends on SMP
|
|
---help---
|
|
Monitor only CPUs in the bitset. Bit 0=CPU0, Bit1=CPU1, etc.
|
|
|
|
config SCHED_INSTRUMENTATION_PREEMPTION
|
|
bool "Preemption monitor hooks"
|
|
default n
|
|
---help---
|
|
Enables additional hooks for changes to pre-emption state. Board-
|
|
specific logic must provide this additional logic.
|
|
|
|
void sched_note_premption(FAR struct tcb_s *tcb, bool state);
|
|
|
|
config SCHED_INSTRUMENTATION_CSECTION
|
|
bool "Critical section monitor hooks"
|
|
default n
|
|
---help---
|
|
Enables additional hooks for entry and exit from critical sections.
|
|
Interrupts are disabled while within a critical section. Board-
|
|
specific logic must provide this additional logic.
|
|
|
|
void sched_note_csection(FAR struct tcb_s *tcb, bool state);
|
|
|
|
config SCHED_INSTRUMENTATION_SPINLOCKS
|
|
bool "Spinlock monitor hooks"
|
|
default n
|
|
---help---
|
|
Enables additional hooks for spinlock state. Board-specific logic
|
|
must provide this additional logic.
|
|
|
|
void sched_note_spinlock(FAR struct tcb_s *tcb, bool state);
|
|
void sched_note_spinlocked(FAR struct tcb_s *tcb, bool state);
|
|
void sched_note_spinunlock(FAR struct tcb_s *tcb, bool state);
|
|
void sched_note_spinabort(FAR struct tcb_s *tcb, bool state);
|
|
|
|
config SCHED_INSTRUMENTATION_BUFFER
|
|
bool "Buffer instrumentation data in memory"
|
|
default n
|
|
---help---
|
|
If this option is selected, then in-memory buffering logic is
|
|
enabled to capture scheduler instrumentation data. This has
|
|
the advantage that (1) the platform logic does not have to provide
|
|
the sched_note_* interaces described for the previous settings.
|
|
Instead, the buffering logic catches all of these. It encodes
|
|
timestamps the scheduler note and adds the note to an in-memory,
|
|
circular buffer. And (2) buffering the scheduler instrumentation
|
|
data (versus performing some output operation) minimizes the impact
|
|
of the instrumentation on the behavior of the system.
|
|
|
|
If the in-memory buffer becomes full, then older notes are
|
|
overwritten by newer notes. The following interface is provided:
|
|
|
|
ssize_t sched_note_get(FAR uint8_t *buffer, size_t buflen);
|
|
|
|
Platform specific information must call this function and dispose
|
|
of it quickly so that overwriting of the tail of the circular buffer
|
|
does not occur. See include/nuttx/sched_note.h for additional
|
|
information.
|
|
|
|
if SCHED_INSTRUMENTATION_BUFFER
|
|
|
|
config SCHED_NOTE_BUFSIZE
|
|
int "Instrumentation buffer size"
|
|
default 2048
|
|
---help---
|
|
The size of the in-memory, circular instrumentation buffer (in
|
|
bytes).
|
|
|
|
config SCHED_NOTE_GET
|
|
int "Callable interface to get instrumentatin data"
|
|
default 2048
|
|
depends on !SCHED_INSTRUMENTATION_CSECTION && (!SCHED_INSTRUMENTATION_SPINLOCK || !SMP)
|
|
---help---
|
|
Add support for interfaces to get the size of the next note and also
|
|
to extract the next note from the instrumentation buffer:
|
|
|
|
ssize_t sched_note_get(FAR uint8_t *buffer, size_t buflen);
|
|
ssize_t sched_note_size(void);
|
|
|
|
NOTE: This option is not available if critical sections are being
|
|
monitor (nor if spinlocks are being monitored in SMP configuration)
|
|
because there would be a logical error in the design in those cases.
|
|
That error is that these interfaces call enter_ and leave_critical_section
|
|
(and which us spinlocks in SMP mode). That means that each call to
|
|
sched_note_get() causes several additional entries to be added from
|
|
the note buffer in order to remove one entry.
|
|
|
|
endif # SCHED_INSTRUMENTATION_BUFFER
|
|
endif # SCHED_INSTRUMENTATION
|
|
endmenu # Performance Monitoring
|
|
|
|
menu "Files and I/O"
|
|
|
|
config DEV_CONSOLE
|
|
bool "Enable /dev/console"
|
|
default y
|
|
---help---
|
|
Set if architecture-specific logic provides /dev/console at boot-up
|
|
time. Enables stdout, stderr, stdin in the start-up application.
|
|
|
|
You need this setting if your console device is ready at boot time.
|
|
For example, if you are using a serial console, then /dev/console
|
|
(aka, /dev/ttyS0) will be available when the application first starts.
|
|
|
|
You must not select DEV_CONSOLE if you console device comes up later
|
|
and is not ready until after the application starts. At this time,
|
|
the only console device that behaves this way is a USB serial console.
|
|
When the application first starts, the USB is (probably) not yet
|
|
connected and /dev/console will not be created until later when the
|
|
host connects to the USB console.
|
|
|
|
config FDCLONE_DISABLE
|
|
bool "Disable cloning of file descriptors"
|
|
default n
|
|
---help---
|
|
Disable cloning of all file descriptors by task_create() when a new
|
|
ask is started. If set, all files/drivers will appear to be closed
|
|
in the new task.
|
|
|
|
config FDCLONE_STDIO
|
|
bool "Disable clone file descriptors without stdio"
|
|
default n
|
|
---help---
|
|
Disable cloning of all but the first three file descriptors (stdin,
|
|
stdout, stderr) by task_create() when a new task is started. If set,
|
|
all files/drivers will appear to be closed in the new task except
|
|
for stdin, stdout, and stderr.
|
|
|
|
config SDCLONE_DISABLE
|
|
bool "Disable cloning of socket descriptors"
|
|
default n
|
|
---help---
|
|
Disable cloning of all socket
|
|
descriptors by task_create() when a new task is started. If
|
|
set, all sockets will appear to be closed in the new task.
|
|
|
|
config NFILE_DESCRIPTORS
|
|
int "Maximum number of file descriptors per task"
|
|
default 16
|
|
---help---
|
|
The maximum number of file descriptors per task (one for each open)
|
|
|
|
config NFILE_STREAMS
|
|
int "Maximum number of FILE streams"
|
|
default 16
|
|
---help---
|
|
The maximum number of streams that can be fopen'ed
|
|
|
|
config NAME_MAX
|
|
int "Maximum size of a file name"
|
|
default 32
|
|
---help---
|
|
The maximum size of a file name.
|
|
|
|
endmenu # Files and I/O
|
|
|
|
menuconfig PRIORITY_INHERITANCE
|
|
bool "Enable priority inheritance "
|
|
default n
|
|
---help---
|
|
Set to enable support for priority inheritance on mutexes and semaphores.
|
|
When this option is enabled, the initial configuration of all seamphores
|
|
and mutexes will be with priority inheritance enabled. That configuration
|
|
may not be appropriate in all cases (such as when the semaphore or mutex
|
|
is used for signaling). In such cases, priority inheritance be be
|
|
disabled for individual semaphores by calling:
|
|
|
|
int ret = sem_setprotocol(&sem, SEM_PRIO_NONE);
|
|
|
|
From applications, the functionally equivalent OS internal interface,
|
|
nxsem_setrotocol() should be used within the OS
|
|
|
|
And for individual pthread mutexes by setting the protocol attribute
|
|
before initializing the mutex:
|
|
|
|
int ret = pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_NONE);
|
|
|
|
if PRIORITY_INHERITANCE
|
|
|
|
config SEM_PREALLOCHOLDERS
|
|
int "Number of pre-allocated holders"
|
|
default 16
|
|
---help---
|
|
This setting is only used if priority inheritance is enabled.
|
|
It defines the maximum number of different threads (minus one) that
|
|
can take counts on a semaphore with priority inheritance support.
|
|
This may be set to zero if priority inheritance is disabled OR if you
|
|
are only using semaphores as mutexes (only one holder) OR if no more
|
|
than two threads participate using a counting semaphore.
|
|
|
|
config SEM_NNESTPRIO
|
|
int "Maximum number of higher priority threads"
|
|
default 16
|
|
---help---
|
|
If priority inheritance is enabled, then this setting is the
|
|
maximum number of higher priority threads (minus 1) than can be
|
|
waiting for another thread to release a count on a semaphore.
|
|
This value may be set to zero if no more than one thread is
|
|
expected to wait for a semaphore.
|
|
|
|
endif # PRIORITY_INHERITANCE
|
|
|
|
menu "RTOS hooks"
|
|
|
|
config BOARD_INITIALIZE
|
|
bool "Custom board/driver initialization"
|
|
default n
|
|
---help---
|
|
By default, there are three points in time where you can insert
|
|
custom initialization logic:
|
|
|
|
1) <arch>_boardinitialize(): This function is used only for
|
|
initialization of very low-level things like configuration of
|
|
GPIO pins, power setting. The OS has not been initialized
|
|
at this point, so you cannot allocate memory or initialize
|
|
device drivers at this phase.
|
|
|
|
2) The next level of initialization is performed by a call to
|
|
up_initialize() (in arch/<arch>/src/common/up_initialize.c).
|
|
The OS has been initialized at this point and it is okay to
|
|
initialize drivers in this phase.
|
|
|
|
3) And, finally, when the user application code starts.
|
|
|
|
If BOARD_INITIALIZE is selected, then an additional initialization
|
|
call will be performed in the boot-up sequence to a function
|
|
called board_initialize(). board_initialize() will be
|
|
call between phases 2) and 3) above, immediately after
|
|
up_initialize() is called. This additional initialization
|
|
phase may be used, for example, to initialize board-specific
|
|
device drivers.
|
|
|
|
if BOARD_INITIALIZE
|
|
|
|
config BOARD_INITTHREAD
|
|
bool "Board initialization thread"
|
|
default n
|
|
---help---
|
|
Some initialization operations cannot be performed on the start-up,
|
|
initialization thread. That is because the initialization thread
|
|
cannot wait for event. If waiting is required as part of the board
|
|
initialization then this option must be selected. Waiting may be
|
|
required, for example, to mount a file system or or initialize a
|
|
device such as an SD card.
|
|
|
|
if BOARD_INITTHREAD
|
|
|
|
config BOARD_INITTHREAD_STACKSIZE
|
|
int "Board initialization thread stack size"
|
|
default 2048
|
|
---help---
|
|
The size of the stack to allocate when starting the board
|
|
initialization thread.
|
|
|
|
config BOARD_INITTHREAD_PRIORITY
|
|
int "Board initialization thread priority"
|
|
default 240
|
|
---help---
|
|
The priority of the board initialization thread. This priority is
|
|
not a critical setting. No other application threads will be
|
|
started until the board initialization is completed. Hence, there
|
|
is very little competition for the CPU.
|
|
|
|
endif # BOARD_INITTHREAD
|
|
endif # BOARD_INITIALIZE
|
|
|
|
config SCHED_STARTHOOK
|
|
bool "Enable startup hook"
|
|
default n
|
|
---help---
|
|
Enable a non-standard, internal OS API call task_starthook().
|
|
task_starthook() registers a function that will be called on task
|
|
startup before that actual task entry point is called. The
|
|
starthook is useful, for example, for setting up automatic
|
|
configuration of C++ constructors.
|
|
|
|
config SCHED_ATEXIT
|
|
bool "Enable atexit() API"
|
|
default n
|
|
---help---
|
|
Enables the atexit() API
|
|
|
|
config SCHED_ATEXIT_MAX
|
|
int "Max number of atexit() functions"
|
|
default 1
|
|
depends on SCHED_ATEXIT && !SCHED_ONEXIT
|
|
---help---
|
|
By default if SCHED_ATEXIT is selected, only a single atexit() function
|
|
is supported. That number can be increased by defined this setting to
|
|
the number that you require.
|
|
|
|
If both SCHED_ONEXIT and SCHED_ATEXIT are selected, then atexit() is built
|
|
on top of the on_exit() implementation. In that case, SCHED_ONEXIT_MAX
|
|
determines the size of the combined number of atexit(0) and on_exit calls
|
|
and SCHED_ATEXIT_MAX is not used.
|
|
|
|
config SCHED_ONEXIT
|
|
bool "Enable on_exit() API"
|
|
default n
|
|
---help---
|
|
Enables the on_exit() API
|
|
|
|
config SCHED_ONEXIT_MAX
|
|
int "Max number of on_exit() functions"
|
|
default 1
|
|
depends on SCHED_ONEXIT
|
|
---help---
|
|
By default if SCHED_ONEXIT is selected, only a single on_exit() function
|
|
is supported. That number can be increased by defined this setting to the
|
|
number that you require.
|
|
|
|
If both SCHED_ONEXIT and SCHED_ATEXIT are selected, then atexit() is built
|
|
on top of the on_exit() implementation. In that case, SCHED_ONEXIT_MAX
|
|
determines the size of the combined number of atexit(0) and on_exit calls.
|
|
|
|
endmenu # RTOS hooks
|
|
|
|
menu "Signal Configuration"
|
|
|
|
config SIG_EVTHREAD
|
|
bool "Support SIGEV_THHREAD"
|
|
default n
|
|
depends on BUILD_FLAT && SCHED_WORKQUEUE
|
|
---help---
|
|
Built in support for the SIGEV_THREAD signal deliver method.
|
|
|
|
NOTE: The current implementation uses a work queue to notify the
|
|
client. This, however, would only work in the FLAT build. A
|
|
different mechanism would need to be development to support this
|
|
feature on the PROTECTED or KERNEL build.
|
|
|
|
config SIG_DEFAULT
|
|
bool "Default signal actions"
|
|
default n
|
|
depends on !DISABLE_SIGNALS
|
|
---help---
|
|
Enable to support default signal actions.
|
|
|
|
NOTE: SIGKILL is the only signal currently supported.
|
|
|
|
menu "Signal Numbers"
|
|
depends on !DISABLE_SIGNALS
|
|
|
|
config SIG_SIGUSR1
|
|
int "SIGUSR1"
|
|
default 1
|
|
---help---
|
|
Value of standard user signal 1 (SIGUSR1). Default: 1
|
|
|
|
config SIG_SIGUSR2
|
|
int "SIGUSR2"
|
|
default 2
|
|
---help---
|
|
Value of standard user signal 2 (SIGUSR2). Default: 2
|
|
|
|
config SIG_SIGALARM
|
|
int "SIGALRM"
|
|
default 3
|
|
---help---
|
|
Default the signal number used with POSIX timers (SIGALRM).
|
|
Default: 3
|
|
|
|
config SIG_SIGCHLD
|
|
int "SIGCHLD"
|
|
default 4
|
|
depends on SCHED_HAVE_PARENT
|
|
---help---
|
|
The SIGCHLD signal is sent to the parent of a child process when it
|
|
exits, is interrupted (stopped), or resumes after being interrupted.
|
|
Default: 4
|
|
|
|
config SIG_POLL
|
|
int "SIGPOLL"
|
|
default 5
|
|
depends on FS_AIO
|
|
---help---
|
|
The SIGPOLL signal is sent to a process when an asynchronous I/O
|
|
event occurs (meaning it has been polled). Default: 5
|
|
|
|
config SIG_KILL
|
|
int "SIGKILL"
|
|
default 9
|
|
depends on SIG_DEFAULT
|
|
---help---
|
|
The SIGKILL signal is sent to cause a task termination event (only
|
|
if CONFIG_SIG_DEFAULT=y)
|
|
|
|
config SIG_SIGCONDTIMEDOUT
|
|
int "SIGCONDTIMEDOUT"
|
|
default 16
|
|
depends on !DISABLE_PTHREAD
|
|
---help---
|
|
This non-standard signal number is used the implementation of
|
|
pthread_cond_timedwait(). Default 16.
|
|
|
|
config SIG_SIGWORK
|
|
int "SIGWORK"
|
|
default 17
|
|
depends on SCHED_WORKQUEUE || LIB_USRWORK
|
|
---help---
|
|
SIGWORK is a non-standard signal used to wake up the internal NuttX
|
|
worker thread. This setting specifies the signal number that will be
|
|
used for SIGWORK. Default: 17
|
|
|
|
endmenu # Signal Numbers
|
|
endmenu # Signal Configuration
|
|
|
|
menu "POSIX Message Queue Options"
|
|
depends on !DISABLE_MQUEUE
|
|
|
|
config PREALLOC_MQ_MSGS
|
|
int "Number of pre-allocated messages"
|
|
default 32
|
|
---help---
|
|
The number of pre-allocated message structures. The system manages
|
|
a pool of preallocated message structures to minimize dynamic allocations
|
|
|
|
config MQ_MAXMSGSIZE
|
|
int "Maximum message size"
|
|
default 32
|
|
---help---
|
|
Message structures are allocated with a fixed payload size given by this
|
|
setting (does not include other message structure overhead.
|
|
|
|
endmenu # POSIX Message Queue Options
|
|
|
|
config MODULE
|
|
bool "Enable loadable OS modules"
|
|
default n
|
|
select LIBC_MODLIB
|
|
select LIBC_ARCH_ELF
|
|
---help---
|
|
Enable support for loadable OS modules. Default: n
|
|
|
|
menu "Work queue support"
|
|
|
|
config SCHED_WORKQUEUE
|
|
# bool "Enable worker thread"
|
|
bool
|
|
default n
|
|
depends on !DISABLE_SIGNALS
|
|
---help---
|
|
Create dedicated "worker" threads to handle delayed or asynchronous
|
|
processing.
|
|
|
|
config SCHED_HPWORK
|
|
bool "High priority (kernel) worker thread"
|
|
default n
|
|
depends on !DISABLE_SIGNALS
|
|
select SCHED_WORKQUEUE
|
|
---help---
|
|
Create a dedicated high-priority "worker" thread to handle delayed
|
|
processing from interrupt handlers. This feature is required for
|
|
some drivers but, if there are no complaints, can be safely
|
|
disabled. The high priority worker thread also performs garbage
|
|
collection -- completing any delayed memory deallocations from
|
|
interrupt handlers. If the high-priority worker thread is disabled,
|
|
then that clean up will be performed either by (1) the low-priority
|
|
worker thread, if enabled, and if not (2) the IDLE thread instead
|
|
(which runs at the lowest of priority and may not be appropriate if
|
|
memory reclamation is of high priority)
|
|
|
|
For other, less-critical asynchronous or delayed process, the
|
|
low-priority worker thread is recommended.
|
|
|
|
if SCHED_HPWORK
|
|
|
|
config SCHED_HPNTHREADS
|
|
int "Number of high-priority worker threads"
|
|
default 1
|
|
---help---
|
|
This options selects multiple, high-priority threads. This is
|
|
essentially a "thread pool" that provides multi-threaded servicing
|
|
of the high-priority work queue. This breaks the serialization
|
|
of the "queue" (hence, it is no longer a queue at all).
|
|
|
|
CAUTION: Some drivers may use the work queue to serialize
|
|
operations. They may also use the high-priority work queue if it is
|
|
available. If there are multiple high-priority worker threads, then
|
|
this can result in the loss of that serialization. There may be
|
|
concurrent driver operations running on different HP threads and
|
|
this could lead to a failure. You may need to visit the use of the
|
|
HP work queue on your configuration is you select
|
|
CONFIG_SCHED_HPNTHREADS > 1
|
|
|
|
config SCHED_HPWORKPRIORITY
|
|
int "High priority worker thread priority"
|
|
default 224
|
|
---help---
|
|
The execution priority of the higher priority worker thread.
|
|
|
|
The higher priority worker thread is intended to serve as the
|
|
"bottom" half for device drivers. As a consequence it must run at
|
|
a very high, fixed priority. Typically, it should be the highest
|
|
priority thread in your system. Default: 224
|
|
|
|
For lower priority, application oriented worker thread support,
|
|
please consider enabling the lower priority work queue. The lower
|
|
priority work queue runs at a lower priority, of course, but has
|
|
the added advantage that it supports "priority inheritance" (if
|
|
PRIORITY_INHERITANCE is also selected): The priority of the lower
|
|
priority worker thread can then be adjusted to match the highest
|
|
priority client.
|
|
|
|
config SCHED_HPWORKSTACKSIZE
|
|
int "High priority worker thread stack size"
|
|
default 2048
|
|
---help---
|
|
The stack size allocated for the worker thread. Default: 2K.
|
|
|
|
endif # SCHED_HPWORK
|
|
|
|
config SCHED_LPWORK
|
|
bool "Low priority (kernel) worker thread"
|
|
default n
|
|
depends on !DISABLE_SIGNALS
|
|
select SCHED_WORKQUEUE
|
|
---help---
|
|
If SCHED_LPWORK is defined then a lower-priority work queue will
|
|
be created. This lower priority work queue is better suited for
|
|
more extended, application oriented processing (such as file system
|
|
clean-up operations or asynchronous I/O)
|
|
|
|
if SCHED_LPWORK
|
|
|
|
config SCHED_LPNTHREADS
|
|
int "Number of low-priority worker threads"
|
|
default 1 if !FS_AIO
|
|
default 4 if FS_AIO
|
|
---help---
|
|
This options selects multiple, low-priority threads. This is
|
|
essentially a "thread pool" that provides multi-threaded servicing
|
|
of the low-priority work queue. This breaks the serialization
|
|
of the "queue" (hence, it is no longer a queue at all).
|
|
|
|
This options is required to support, for example, I/O operations
|
|
that stall waiting for input. If there is only a single thread,
|
|
then the entire low-priority queue processing stalls in such cases.
|
|
Such behavior is necessary to support asynchronous I/O, AIO (for
|
|
example).
|
|
|
|
CAUTION: Some drivers may use the work queue to serialize
|
|
operations. They may also use the low-priority work queue if it is
|
|
available. If there are multiple low-priority worker threads, then
|
|
this can result in the loss of that serialization. There may be
|
|
concurrent driver operations running on different LP threads and
|
|
this could lead to a failure. You may need to visit the use of the
|
|
LP work queue on your configuration is you select
|
|
CONFIG_SCHED_LPNTHREADS > 1
|
|
|
|
config SCHED_LPWORKPRIORITY
|
|
int "Low priority worker thread priority"
|
|
default 50
|
|
---help---
|
|
The minimum execution priority of the lower priority worker thread.
|
|
|
|
The lower priority worker thread is intended support application-
|
|
oriented functions. The lower priority work queue runs at a lower
|
|
priority, of course, but has the added advantage that it supports
|
|
"priority inheritance" (if PRIORITY_INHERITANCE is also selected):
|
|
The priority of the lower priority worker thread can then be
|
|
adjusted to match the highest priority client. Default: 50
|
|
|
|
NOTE: This priority inheritance feature is not automatic. The
|
|
lower priority worker thread will always a fixed priority unless
|
|
you implement logic that calls lpwork_boostpriority() to raise the
|
|
priority of the lower priority worker thread (typically called
|
|
before scheduling the work) and then call the matching
|
|
lpwork_restorepriority() when the work is completed (typically
|
|
called within the work handler at the completion of the work).
|
|
Currently, only the NuttX asynchronous I/O logic uses this dynamic
|
|
prioritization feature.
|
|
|
|
The higher priority worker thread, on the other hand, is intended
|
|
to serve as the "bottom" half for device drivers. As a consequence
|
|
it must run at a very high, fixed priority. Typically, it should
|
|
be the highest priority thread in your system.
|
|
|
|
config SCHED_LPWORKPRIOMAX
|
|
int "Low priority worker thread maximum priority"
|
|
default 176
|
|
depends on PRIORITY_INHERITANCE
|
|
---help---
|
|
The maximum execution priority of the lower priority worker thread.
|
|
|
|
The lower priority worker thread is intended support application-
|
|
oriented functions. The lower priority work queue runs at a lower
|
|
priority, of course, but has the added advantage that it supports
|
|
"priority inheritance" (if PRIORITY_INHERITANCE is also selected):
|
|
The priority of the lower priority worker thread can then be
|
|
adjusted to match the highest priority client.
|
|
|
|
The higher priority worker thread, on the other hand, is intended
|
|
to serve as the "bottom" half for device drivers. As a consequence
|
|
it must run at a very high, fixed priority. Typically, it should
|
|
be the highest priority thread in your system.
|
|
|
|
This value provides an upper limit on the priority of the lower
|
|
priority worker thread. This would be necessary, for example, if
|
|
the higher priority worker thread were to defer work to the lower
|
|
priority thread. Clearly, in such a case, you would want to limit
|
|
the maximum priority of the lower priority work thread. Default:
|
|
176
|
|
|
|
config SCHED_LPWORKSTACKSIZE
|
|
int "Low priority worker thread stack size"
|
|
default 2048
|
|
---help---
|
|
The stack size allocated for the lower priority worker thread. Default: 2K.
|
|
|
|
endif # SCHED_LPWORK
|
|
endmenu # Work Queue Support
|
|
|
|
menu "Stack and heap information"
|
|
|
|
config IDLETHREAD_STACKSIZE
|
|
int "Idle thread stack size"
|
|
default 1024
|
|
---help---
|
|
The size of the initial stack used by the IDLE thread. The IDLE thread
|
|
is the thread that (1) performs the initial boot of the system up to the
|
|
point where start-up application is spawned, and (2) there after is the
|
|
IDLE thread that executes only when there is no other thread ready to run.
|
|
|
|
config USERMAIN_STACKSIZE
|
|
int "Main thread stack size"
|
|
default 2048
|
|
---help---
|
|
The size of the stack to allocate for the user initialization thread
|
|
that is started as soon as the OS completes its initialization.
|
|
|
|
config PTHREAD_STACK_MIN
|
|
int "Minimum pthread stack size"
|
|
default 256
|
|
---help---
|
|
Minimum pthread stack size
|
|
|
|
config PTHREAD_STACK_DEFAULT
|
|
int "Default pthread stack size"
|
|
default 2048
|
|
---help---
|
|
Default pthread stack size
|
|
|
|
endmenu # Stack and heap information
|