arch: add CONFIG_DEMAND_PAGING
Indicates at the kernel level that demand paging is active. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
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arch/Kconfig
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arch/Kconfig
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@ -517,6 +517,12 @@ config CPU_HAS_MMU
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This hidden option is selected when the CPU has a Memory Management Unit
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(MMU).
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config ARCH_HAS_DEMAND_PAGING
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bool
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help
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This hidden configuration should be selected by the architecture if
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demand paging is supported.
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config ARCH_HAS_RESERVED_PAGE_FRAMES
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bool
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help
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@ -607,6 +613,30 @@ config KERNEL_VM_SIZE
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implement a notion of "high" memory in Zephyr to work around physical
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RAM size larger than the defined bounds of the virtual address space.
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config DEMAND_PAGING
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bool "Enable demand paging [EXPERIMENTAL]"
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depends on ARCH_HAS_DEMAND_PAGING
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help
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Enable demand paging. Requires architecture support in how the kernel
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is linked and the implementation of an eviction algorithm and a
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backing store for evicted pages.
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if DEMAND_PAGING
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config DEMAND_PAGING_ALLOW_IRQ
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bool "Allow interrupts during page-ins/outs"
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help
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Allow interrupts to be serviced while pages are being evicted or
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retrieved from the backing store. This is much better for system
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latency, but any code running in interrupt context that page faults
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will cause a kernel panic. Such code must work with exclusively pinned
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code and data pages.
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The scheduler is still disabled during this operation.
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If this option is disabled, the page fault servicing logic
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runs with interrupts disabled for the entire operation. However,
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ISRs may also page fault.
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endif # DEMAND_PAGING
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endif # MMU
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menuconfig MPU
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