kernel: reorg Kconfigs and split them
The kernel kconfig is becoming too big and unmanageable with too many options scattered across the file. Move some areas out and reorg main Kconfig slightly. Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This commit is contained in:
Anas Nashif
parent
8791012ed1
commit
6e95bdeca6
409
kernel/Kconfig
409
kernel/Kconfig
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@ -265,43 +265,6 @@ endchoice # DYNAMIC_THREAD_PREFER
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endif # DYNAMIC_THREADS
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config LIBC_ERRNO
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bool
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help
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Use external libc errno, not the internal one. This eliminates any
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locally allocated errno storage and usage.
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config ERRNO
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bool "Errno support"
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default y
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help
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Enable per-thread errno in the kernel. Application and library code must
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include errno.h provided by the C library (libc) to use the errno
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symbol. The C library must access the per-thread errno via the
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z_errno() symbol.
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config ERRNO_IN_TLS
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bool "Store errno in thread local storage (TLS)"
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depends on ERRNO && THREAD_LOCAL_STORAGE && !LIBC_ERRNO
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default y
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help
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Use thread local storage to store errno instead of storing it in
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the kernel thread struct. This avoids a syscall if userspace is enabled.
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config CURRENT_THREAD_USE_NO_TLS
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bool
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help
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Hidden symbol to not use thread local storage to store current
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thread.
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config CURRENT_THREAD_USE_TLS
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bool "Store current thread in thread local storage (TLS)"
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depends on THREAD_LOCAL_STORAGE && !CURRENT_THREAD_USE_NO_TLS
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default y
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help
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Use thread local storage to store the current thread. This avoids a
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syscall if userspace is enabled.
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choice SCHED_ALGORITHM
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prompt "Scheduler priority queue algorithm"
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default SCHED_DUMB
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@ -386,6 +349,46 @@ config WAITQ_DUMB
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endchoice # WAITQ_ALGORITHM
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menu "Misc Kernel related options"
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config LIBC_ERRNO
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bool
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help
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Use external libc errno, not the internal one. This eliminates any
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locally allocated errno storage and usage.
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config ERRNO
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bool "Errno support"
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default y
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help
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Enable per-thread errno in the kernel. Application and library code must
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include errno.h provided by the C library (libc) to use the errno
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symbol. The C library must access the per-thread errno via the
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z_errno() symbol.
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config ERRNO_IN_TLS
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bool "Store errno in thread local storage (TLS)"
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depends on ERRNO && THREAD_LOCAL_STORAGE && !LIBC_ERRNO
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default y
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help
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Use thread local storage to store errno instead of storing it in
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the kernel thread struct. This avoids a syscall if userspace is enabled.
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config CURRENT_THREAD_USE_NO_TLS
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bool
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help
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Hidden symbol to not use thread local storage to store current
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thread.
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config CURRENT_THREAD_USE_TLS
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bool "Store current thread in thread local storage (TLS)"
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depends on THREAD_LOCAL_STORAGE && !CURRENT_THREAD_USE_NO_TLS
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default y
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help
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Use thread local storage to store the current thread. This avoids a
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syscall if userspace is enabled.
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endmenu
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menu "Kernel Debugging and Metrics"
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config INIT_STACKS
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@ -518,160 +521,9 @@ endif # THREAD_RUNTIME_STATS
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endmenu
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menuconfig OBJ_CORE
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bool "Object core framework"
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default n
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help
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This option enables the object core framework. This will link
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participating kernel objects and their respective types together
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in a way that allows them to both have common information stored
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together and for that information to be easily retrieved by
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automated means.
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rsource "Kconfig.obj_core"
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if OBJ_CORE
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config OBJ_CORE_CONDVAR
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bool "Integrate condition variables into object core framework"
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default y
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help
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When enabled, this option integrates condition variables into the
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object core framework.
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config OBJ_CORE_EVENT
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bool "Integrate events into object core framework"
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default y if EVENTS
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help
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When enabled, this option integrate kernel events into the object
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core framework.
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config OBJ_CORE_FIFO
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bool "Integrate FIFOs into object core framework"
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default y
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help
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When enabled, this option integrates FIFOs into the object core
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framework.
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config OBJ_CORE_LIFO
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bool "Integrate LIFOs into object core framework"
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default y
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help
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When enabled, this option integrates LIFOs into the object core
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framework.
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config OBJ_CORE_MAILBOX
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bool "Integrate mailboxes into object core framework"
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default y
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help
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When enabled, this option integrates mailboxes into the object core
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framework.
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config OBJ_CORE_MEM_SLAB
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bool "Integrate memory slabs into object core framework"
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default y
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help
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When enabled, this option integrates memory slabs into the object
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core framework.
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config OBJ_CORE_MUTEX
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bool "Integrate mutexes into object core framework"
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default y
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help
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When enabled, this option integrates mutexes into the object core
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framework.
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config OBJ_CORE_MSGQ
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bool "Integrate message queues into object core framework"
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default y
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help
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When enabled, this option integrates message queues into the object
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core framework.
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config OBJ_CORE_SEM
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bool "Integrate semaphores into object core framework"
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default y
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help
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When enabled, this option integrates semaphores into the object core
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framework.
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config OBJ_CORE_PIPE
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bool "Integrate pipe into object core framework"
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default y if PIPES
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help
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When enabled, this option integrates pipes into the object core
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framework.
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config OBJ_CORE_SEM
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bool "Integrate semaphores into object core framework"
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default y
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help
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When enabled, this option integrates semaphores into the object core
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framework.
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config OBJ_CORE_STACK
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bool "Integrate stacks into object core framework"
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default y
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help
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When enabled, this option integrates stacks into the object core
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framework.
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config OBJ_CORE_THREAD
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bool "Integrate threads into object core framework"
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default y
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help
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When enabled, this option integrates threads into the object core
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framework.
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config OBJ_CORE_TIMER
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bool "Integrate timers into object core framework"
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default y
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help
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When enabled, this option integrates timers into the object core
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framework.
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config OBJ_CORE_SYSTEM
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bool
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default y
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help
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When enabled, this option integrates the internal CPU and kernel
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system objects into the object core framework. As these are internal
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structures, this option is hidden by default and only available to
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advanced users.
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menuconfig OBJ_CORE_STATS
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bool "Object core statistics"
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default n
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help
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This option integrates statistics gathering into the object core
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framework.
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if OBJ_CORE_STATS
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config OBJ_CORE_STATS_MEM_SLAB
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bool "Object core statistics for memory slabs"
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default y if OBJ_CORE_MEM_SLAB
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help
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When enabled, this allows memory slab statistics to be integrated
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into kernel objects.
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config OBJ_CORE_STATS_THREAD
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bool "Object core statistics for threads"
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default y if OBJ_CORE_THREAD
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select THREAD_RUNTIME_STATS
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help
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When enabled, this integrates thread runtime statistics into the
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object core statistics framework.
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config OBJ_CORE_STATS_SYSTEM
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bool "Object core statistics for system level objects"
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default y if OBJ_CORE_SYSTEM
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select SCHED_THREAD_USAGE_ALL
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help
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When enabled, this integrates thread runtime statistics at the
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CPU and system level into the object core statistics framework.
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endif # OBJ_CORE_STATS
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endif # OBJ_CORE
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menu "Work Queue Options"
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menu "System Work Queue Options"
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config SYSTEM_WORKQUEUE_STACK_SIZE
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int "System workqueue stack size"
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default 4096 if COVERAGE_GCOV
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@ -777,6 +629,10 @@ config TIMESLICE_PER_THREAD
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a per-thread basis, with an application callback invoked when
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a thread reaches the end of its timeslice.
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endmenu
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menu "Other Kernel Object Options"
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config POLL
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bool "Async I/O Framework"
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help
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@ -785,10 +641,6 @@ config POLL
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concurrently, which can be either directly triggered or triggered by
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the availability of some kernel objects (semaphores and FIFOs).
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endmenu
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menu "Other Kernel Object Options"
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config MEM_SLAB_TRACE_MAX_UTILIZATION
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bool "Getting maximum slab utilization"
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help
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@ -976,39 +828,6 @@ config XIP
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supply a linker command file when building your image. Enabling this
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option increases both the code and data footprint of the image.
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menu "Initialization Priorities"
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config KERNEL_INIT_PRIORITY_OBJECTS
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int "Kernel objects initialization priority"
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default 30
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help
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Kernel objects use this priority for initialization. This
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priority needs to be higher than minimal default initialization
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priority.
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config KERNEL_INIT_PRIORITY_DEFAULT
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int "Default init priority"
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default 40
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help
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Default minimal init priority for each init level.
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config KERNEL_INIT_PRIORITY_DEVICE
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int "Default init priority for device drivers"
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default 50
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help
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Device driver, that depends on common components, such as
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interrupt controller, but does not depend on other devices,
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uses this init priority.
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config APPLICATION_INIT_PRIORITY
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int "Default init priority for application level drivers"
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default 90
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help
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This priority level is for end-user drivers such as sensors and display
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which have no inward dependencies.
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endmenu
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menu "Security Options"
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@ -1095,6 +914,9 @@ config BOUNDS_CHECK_BYPASS_MITIGATION
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macros do nothing.
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endmenu
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menu "Memory Domains"
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config MAX_DOMAIN_PARTITIONS
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int "Maximum number of partitions per memory domain"
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default 16
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@ -1143,112 +965,10 @@ config ARCH_MEM_DOMAIN_SYNCHRONOUS_API
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tables, these APIs don't need to be implemented as the underlying
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memory management hardware will be reprogrammed on context switch
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anyway.
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menu "SMP Options"
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config SMP
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bool "Symmetric multiprocessing support"
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depends on USE_SWITCH
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depends on !ATOMIC_OPERATIONS_C
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help
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When true, kernel will be built with SMP support, allowing
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more than one CPU to schedule Zephyr tasks at a time.
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config USE_SWITCH
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bool "Use new-style _arch_switch instead of arch_swap"
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depends on USE_SWITCH_SUPPORTED
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help
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The _arch_switch() API is a lower level context switching
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primitive than the original arch_swap mechanism. It is required
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for an SMP-aware scheduler, or if the architecture does not
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provide arch_swap. In uniprocess situations where the
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architecture provides both, _arch_switch incurs more somewhat
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overhead and may be slower.
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config USE_SWITCH_SUPPORTED
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bool
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help
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Indicates whether _arch_switch() API is supported by the
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currently enabled platform. This option should be selected by
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platforms that implement it.
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config SMP_BOOT_DELAY
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bool "Delay booting secondary cores"
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depends on SMP
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help
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By default Zephyr will boot all available CPUs during start up.
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Select this option to skip this and allow custom code
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(architecture/SoC/board/application) to boot secondary CPUs at
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a later time.
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config MP_NUM_CPUS
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int "Number of CPUs/cores [DEPRECATED]"
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default MP_MAX_NUM_CPUS
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range 1 12
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help
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This is deprecated, please use MP_MAX_NUM_CPUS instead.
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config MP_MAX_NUM_CPUS
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int "Maximum number of CPUs/cores"
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default 1
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range 1 12
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help
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Maximum number of multiprocessing-capable cores available to the
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multicpu API and SMP features.
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config SCHED_IPI_SUPPORTED
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bool
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help
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True if the architecture supports a call to
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arch_sched_ipi() to broadcast an interrupt that will call
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z_sched_ipi() on other CPUs in the system. Required for
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k_thread_abort() to operate with reasonable latency
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(otherwise we might have to wait for the other thread to
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take an interrupt, which can be arbitrarily far in the
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future).
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config TRACE_SCHED_IPI
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bool "Test IPI"
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help
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When true, it will add a hook into z_sched_ipi(), in order
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to check if schedule IPI has called or not, for testing
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purpose.
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depends on SCHED_IPI_SUPPORTED
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depends on MP_MAX_NUM_CPUS>1
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config KERNEL_COHERENCE
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bool "Place all shared data into coherent memory"
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depends on ARCH_HAS_COHERENCE
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default y if SMP && MP_MAX_NUM_CPUS > 1
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select THREAD_STACK_INFO
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help
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When available and selected, the kernel will build in a mode
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where all shared data is placed in multiprocessor-coherent
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(generally "uncached") memory. Thread stacks will remain
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cached, as will application memory declared with
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__incoherent. This is intended for Zephyr SMP kernels
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running on cache-incoherent architectures only. Note that
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when this is selected, there is an implicit API change that
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assumes cache coherence to any memory passed to the kernel.
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Code that creates kernel data structures in uncached regions
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may fail strangely. Some assertions exist to catch these
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mistakes, but not all circumstances can be tested.
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config TICKET_SPINLOCKS
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bool "Ticket spinlocks for lock acquisition fairness [EXPERIMENTAL]"
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select EXPERIMENTAL
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help
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Basic spinlock implementation is based on single
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atomic variable and doesn't guarantee locking fairness
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across multiple CPUs. It's even possible that single CPU
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will win the contention every time which will result
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in a live-lock.
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Ticket spinlocks provide a FIFO order of lock acquisition
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which resolves such unfairness issue at the cost of slightly
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increased memory footprint.
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endmenu
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rsource "Kconfig.smp"
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config TICKLESS_KERNEL
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bool "Tickless kernel"
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default y if TICKLESS_CAPABLE
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@ -1273,30 +993,5 @@ config THREAD_LOCAL_STORAGE
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endmenu
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menu "Device Options"
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config DEVICE_DEPS
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bool "Store device dependencies"
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help
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When enabled, device dependencies will be stored so that they can be
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queried at runtime. Device dependencies are typically inferred from
|
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devicetree. Enabling this option will increase ROM usage (or RAM if
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dynamic device dependencies are enabled).
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config DEVICE_DEPS_DYNAMIC
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bool "Dynamic device dependencies"
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depends on DEVICE_DEPS
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help
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Option that makes it possible to manipulate device dependencies at
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runtime.
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config DEVICE_MUTABLE
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bool "Mutable devices [EXPERIMENTAL]"
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select EXPERIMENTAL
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help
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Support mutable devices. Mutable devices are instantiated in SRAM
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instead of Flash and are runtime modifiable in kernel mode.
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endmenu
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rsource "Kconfig.device"
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rsource "Kconfig.vm"
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|
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63
kernel/Kconfig.device
Normal file
63
kernel/Kconfig.device
Normal file
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@ -0,0 +1,63 @@
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# Copyright (c) 2014-2015 Wind River Systems, Inc.
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# Copyright (c) 2024 Intel Corp.
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# SPDX-License-Identifier: Apache-2.0
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#
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menu "Device Options"
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config DEVICE_DEPS
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bool "Store device dependencies"
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help
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When enabled, device dependencies will be stored so that they can be
|
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queried at runtime. Device dependencies are typically inferred from
|
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devicetree. Enabling this option will increase ROM usage (or RAM if
|
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dynamic device dependencies are enabled).
|
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|
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config DEVICE_DEPS_DYNAMIC
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bool "Dynamic device dependencies"
|
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depends on DEVICE_DEPS
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help
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Option that makes it possible to manipulate device dependencies at
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runtime.
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config DEVICE_MUTABLE
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bool "Mutable devices [EXPERIMENTAL]"
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select EXPERIMENTAL
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help
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Support mutable devices. Mutable devices are instantiated in SRAM
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instead of Flash and are runtime modifiable in kernel mode.
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endmenu
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menu "Initialization Priorities"
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config KERNEL_INIT_PRIORITY_OBJECTS
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int "Kernel objects initialization priority"
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default 30
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help
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Kernel objects use this priority for initialization. This
|
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priority needs to be higher than minimal default initialization
|
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priority.
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config KERNEL_INIT_PRIORITY_DEFAULT
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int "Default init priority"
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default 40
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help
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Default minimal init priority for each init level.
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config KERNEL_INIT_PRIORITY_DEVICE
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int "Default init priority for device drivers"
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default 50
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help
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Device driver, that depends on common components, such as
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interrupt controller, but does not depend on other devices,
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uses this init priority.
|
||||
|
||||
config APPLICATION_INIT_PRIORITY
|
||||
int "Default init priority for application level drivers"
|
||||
default 90
|
||||
help
|
||||
This priority level is for end-user drivers such as sensors and display
|
||||
which have no inward dependencies.
|
||||
|
||||
|
||||
endmenu
|
||||
155
kernel/Kconfig.obj_core
Normal file
155
kernel/Kconfig.obj_core
Normal file
|
|
@ -0,0 +1,155 @@
|
|||
# Copyright (c) 2024 Intel Corp.
|
||||
# SPDX-License-Identifier: Apache-2.0
|
||||
#
|
||||
menuconfig OBJ_CORE
|
||||
bool "Object core framework"
|
||||
default n
|
||||
help
|
||||
This option enables the object core framework. This will link
|
||||
participating kernel objects and their respective types together
|
||||
in a way that allows them to both have common information stored
|
||||
together and for that information to be easily retrieved by
|
||||
automated means.
|
||||
|
||||
if OBJ_CORE
|
||||
config OBJ_CORE_CONDVAR
|
||||
bool "Integrate condition variables into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates condition variables into the
|
||||
object core framework.
|
||||
|
||||
config OBJ_CORE_EVENT
|
||||
bool "Integrate events into object core framework"
|
||||
default y if EVENTS
|
||||
help
|
||||
When enabled, this option integrate kernel events into the object
|
||||
core framework.
|
||||
|
||||
config OBJ_CORE_FIFO
|
||||
bool "Integrate FIFOs into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates FIFOs into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_LIFO
|
||||
bool "Integrate LIFOs into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates LIFOs into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_MAILBOX
|
||||
bool "Integrate mailboxes into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates mailboxes into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_MEM_SLAB
|
||||
bool "Integrate memory slabs into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates memory slabs into the object
|
||||
core framework.
|
||||
|
||||
config OBJ_CORE_MUTEX
|
||||
bool "Integrate mutexes into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates mutexes into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_MSGQ
|
||||
bool "Integrate message queues into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates message queues into the object
|
||||
core framework.
|
||||
|
||||
config OBJ_CORE_SEM
|
||||
bool "Integrate semaphores into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates semaphores into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_PIPE
|
||||
bool "Integrate pipe into object core framework"
|
||||
default y if PIPES
|
||||
help
|
||||
When enabled, this option integrates pipes into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_SEM
|
||||
bool "Integrate semaphores into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates semaphores into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_STACK
|
||||
bool "Integrate stacks into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates stacks into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_THREAD
|
||||
bool "Integrate threads into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates threads into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_TIMER
|
||||
bool "Integrate timers into object core framework"
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates timers into the object core
|
||||
framework.
|
||||
|
||||
config OBJ_CORE_SYSTEM
|
||||
bool
|
||||
default y
|
||||
help
|
||||
When enabled, this option integrates the internal CPU and kernel
|
||||
system objects into the object core framework. As these are internal
|
||||
structures, this option is hidden by default and only available to
|
||||
advanced users.
|
||||
|
||||
menuconfig OBJ_CORE_STATS
|
||||
bool "Object core statistics"
|
||||
default n
|
||||
help
|
||||
This option integrates statistics gathering into the object core
|
||||
framework.
|
||||
|
||||
if OBJ_CORE_STATS
|
||||
config OBJ_CORE_STATS_MEM_SLAB
|
||||
bool "Object core statistics for memory slabs"
|
||||
default y if OBJ_CORE_MEM_SLAB
|
||||
help
|
||||
When enabled, this allows memory slab statistics to be integrated
|
||||
into kernel objects.
|
||||
|
||||
config OBJ_CORE_STATS_THREAD
|
||||
bool "Object core statistics for threads"
|
||||
default y if OBJ_CORE_THREAD
|
||||
select THREAD_RUNTIME_STATS
|
||||
help
|
||||
When enabled, this integrates thread runtime statistics into the
|
||||
object core statistics framework.
|
||||
|
||||
config OBJ_CORE_STATS_SYSTEM
|
||||
bool "Object core statistics for system level objects"
|
||||
default y if OBJ_CORE_SYSTEM
|
||||
select SCHED_THREAD_USAGE_ALL
|
||||
help
|
||||
When enabled, this integrates thread runtime statistics at the
|
||||
CPU and system level into the object core statistics framework.
|
||||
|
||||
endif # OBJ_CORE_STATS
|
||||
|
||||
endif # OBJ_CORE
|
||||
107
kernel/Kconfig.smp
Normal file
107
kernel/Kconfig.smp
Normal file
|
|
@ -0,0 +1,107 @@
|
|||
# Copyright (c) 2024 Intel Corp.
|
||||
# SPDX-License-Identifier: Apache-2.0
|
||||
#
|
||||
menu "SMP Options"
|
||||
|
||||
config SMP
|
||||
bool "Symmetric multiprocessing support"
|
||||
depends on USE_SWITCH
|
||||
depends on !ATOMIC_OPERATIONS_C
|
||||
help
|
||||
When true, kernel will be built with SMP support, allowing
|
||||
more than one CPU to schedule Zephyr tasks at a time.
|
||||
|
||||
config USE_SWITCH
|
||||
bool "Use new-style _arch_switch instead of arch_swap"
|
||||
depends on USE_SWITCH_SUPPORTED
|
||||
help
|
||||
The _arch_switch() API is a lower level context switching
|
||||
primitive than the original arch_swap mechanism. It is required
|
||||
for an SMP-aware scheduler, or if the architecture does not
|
||||
provide arch_swap. In uniprocess situations where the
|
||||
architecture provides both, _arch_switch incurs more somewhat
|
||||
overhead and may be slower.
|
||||
|
||||
config USE_SWITCH_SUPPORTED
|
||||
bool
|
||||
help
|
||||
Indicates whether _arch_switch() API is supported by the
|
||||
currently enabled platform. This option should be selected by
|
||||
platforms that implement it.
|
||||
|
||||
config SMP_BOOT_DELAY
|
||||
bool "Delay booting secondary cores"
|
||||
depends on SMP
|
||||
help
|
||||
By default Zephyr will boot all available CPUs during start up.
|
||||
Select this option to skip this and allow custom code
|
||||
(architecture/SoC/board/application) to boot secondary CPUs at
|
||||
a later time.
|
||||
|
||||
config MP_NUM_CPUS
|
||||
int "Number of CPUs/cores [DEPRECATED]"
|
||||
default MP_MAX_NUM_CPUS
|
||||
range 1 12
|
||||
help
|
||||
This is deprecated, please use MP_MAX_NUM_CPUS instead.
|
||||
|
||||
config MP_MAX_NUM_CPUS
|
||||
int "Maximum number of CPUs/cores"
|
||||
default 1
|
||||
range 1 12
|
||||
help
|
||||
Maximum number of multiprocessing-capable cores available to the
|
||||
multicpu API and SMP features.
|
||||
|
||||
config SCHED_IPI_SUPPORTED
|
||||
bool
|
||||
help
|
||||
True if the architecture supports a call to
|
||||
arch_sched_ipi() to broadcast an interrupt that will call
|
||||
z_sched_ipi() on other CPUs in the system. Required for
|
||||
k_thread_abort() to operate with reasonable latency
|
||||
(otherwise we might have to wait for the other thread to
|
||||
take an interrupt, which can be arbitrarily far in the
|
||||
future).
|
||||
|
||||
config TRACE_SCHED_IPI
|
||||
bool "Test IPI"
|
||||
help
|
||||
When true, it will add a hook into z_sched_ipi(), in order
|
||||
to check if schedule IPI has called or not, for testing
|
||||
purpose.
|
||||
depends on SCHED_IPI_SUPPORTED
|
||||
depends on MP_MAX_NUM_CPUS>1
|
||||
|
||||
config KERNEL_COHERENCE
|
||||
bool "Place all shared data into coherent memory"
|
||||
depends on ARCH_HAS_COHERENCE
|
||||
default y if SMP && MP_MAX_NUM_CPUS > 1
|
||||
select THREAD_STACK_INFO
|
||||
help
|
||||
When available and selected, the kernel will build in a mode
|
||||
where all shared data is placed in multiprocessor-coherent
|
||||
(generally "uncached") memory. Thread stacks will remain
|
||||
cached, as will application memory declared with
|
||||
__incoherent. This is intended for Zephyr SMP kernels
|
||||
running on cache-incoherent architectures only. Note that
|
||||
when this is selected, there is an implicit API change that
|
||||
assumes cache coherence to any memory passed to the kernel.
|
||||
Code that creates kernel data structures in uncached regions
|
||||
may fail strangely. Some assertions exist to catch these
|
||||
mistakes, but not all circumstances can be tested.
|
||||
|
||||
config TICKET_SPINLOCKS
|
||||
bool "Ticket spinlocks for lock acquisition fairness [EXPERIMENTAL]"
|
||||
select EXPERIMENTAL
|
||||
help
|
||||
Basic spinlock implementation is based on single
|
||||
atomic variable and doesn't guarantee locking fairness
|
||||
across multiple CPUs. It's even possible that single CPU
|
||||
will win the contention every time which will result
|
||||
in a live-lock.
|
||||
Ticket spinlocks provide a FIFO order of lock acquisition
|
||||
which resolves such unfairness issue at the cost of slightly
|
||||
increased memory footprint.
|
||||
|
||||
endmenu
|
||||
Loading…
Reference in a new issue