Re: [PATCH V12] mm/debug: Add tests validating architecture page table helpers

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Le 02/02/2020 à 12:26, Qian Cai a écrit :

On Jan 30, 2020, at 9:13 AM, Christophe Leroy <christophe.leroy@xxxxxx> wrote:

    bool "Debug arch page table for semantics compliance" if ARCH_HAS_DEBUG_VM_PGTABLE || EXPERT
    depends on MMU
    default 'n' if !ARCH_HAS_DEBUG_VM_PGTABLE
    default 'y' if DEBUG_VM

Does it really necessary to potentially force all bots to run this? Syzbot, kernel test robot etc? Does it ever pay off for all their machine times there?

Machine time ?

On a 32 bits powerpc running at 132 MHz, the tests takes less than 10ms. Is it worth taking the risk of not detecting faults by not selecting it by default ?

[ 5.656916] debug_vm_pgtable: debug_vm_pgtable: Validating architecture page table helpers [ 5.665661] debug_vm_pgtable: debug_vm_pgtable: Validated architecture page table helpers


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