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CONFIG_DEBUG_PAGEALLOC: Debug page memory allocations

General informations

The Linux kernel configuration item CONFIG_DEBUG_PAGEALLOC has multiple definitions:

Debug page memory allocations found in arch/i386/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && ! CONFIG_HIBERNATION && ! CONFIG_HUGETLBFS
• defined in arch/i386/Kconfig.debug
• found in Linux kernels: 2.6.17–2.6.23

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/m32r/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && CONFIG_BROKEN
• defined in arch/m32r/Kconfig.debug
• found in Linux kernels: 2.6.17–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/powerpc/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && ! CONFIG_HIBERNATION
• defined in arch/powerpc/Kconfig.debug
• found in Linux kernels: 2.6.22–2.6.29

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/s390/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/s390/Kconfig.debug
• found in Linux kernels: 2.6.25–2.6.29

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/sparc/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_SPARC64 && CONFIG_DEBUG_KERNEL && ! CONFIG_HIBERNATION
• defined in arch/sparc/Kconfig.debug
• found in Linux kernels: 2.6.29

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/sparc64/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && ! CONFIG_HIBERNATION
• defined in arch/sparc64/Kconfig.debug
• found in Linux kernels: 2.6.17–2.6.28

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in arch/x86/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/x86/Kconfig.debug
• found in Linux kernels: 2.6.24–2.6.29

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Debug page memory allocations found in mm/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Debug page memory allocations
• type: bool
• depends on: ( CONFIG_DEBUG_KERNEL ) && (! CONFIG_HIBERNATION || CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC && ! CONFIG_PPC && ! CONFIG_SPARC ) && (! CONFIG_KMEMCHECK )
• defined in mm/Kconfig.debug
• found in Linux kernels: 2.6.30–2.6.39, 3.0–3.9, 3.10-rc+HEAD

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruption.

For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC, fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages(). Additionally, this option cannot be enabled in combination with hibernation as that would result in incorrect warnings of memory corruption after a resume because free pages are not saved to the suspend image.

Page alloc debugging found in arch/frv/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/frv/Kconfig.debug
• found in Linux kernels: 2.6.12–2.6.15

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/frv/Kconfig

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/frv/Kconfig
• found in Linux kernels: 2.6.11

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/i386/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/i386/Kconfig.debug
• found in Linux kernels: 2.6.9–2.6.16

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/i386/Kconfig

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/i386/Kconfig
• found in Linux kernels: 2.6.0–2.6.8

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/m32r/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && CONFIG_BROKEN
• defined in arch/m32r/Kconfig.debug
• found in Linux kernels: 2.6.10–2.6.16

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/m32r/Kconfig

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL
• defined in arch/m32r/Kconfig
• found in Linux kernels: 2.6.9

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

Page alloc debugging found in arch/sparc64/Kconfig.debug

The configuration item CONFIG_DEBUG_PAGEALLOC:

• prompt: Page alloc debugging
• type: bool
• depends on: CONFIG_DEBUG_KERNEL && ! CONFIG_SOFTWARE_SUSPEND
• defined in arch/sparc64/Kconfig.debug
• found in Linux kernels: 2.6.14–2.6.16

Help text

Unmap pages from the kernel linear mapping after free_pages(). This results in a large slowdown, but helps to find certain types of memory corruptions.

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