[PATCH V3 0/4] mm/debug_vm_pgtable: Add some more tests

[Vineet Gupta]

On 6/29/20 8:53 PM, Anshuman Khandual wrote:
> 
> 
> On 06/24/2020 08:43 AM, Anshuman Khandual wrote:
>>
>>
>> On 06/15/2020 09:07 AM, Anshuman Khandual wrote:
>>> This series adds some more arch page table helper validation tests which
>>> are related to core and advanced memory functions. This also creates a
>>> documentation, enlisting expected semantics for all page table helpers as
>>> suggested by Mike Rapoport previously (https://lkml.org/lkml/2020/1/30/40).
>>>
>>> There are many TRANSPARENT_HUGEPAGE and ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD
>>> ifdefs scattered across the test. But consolidating all the fallback stubs
>>> is not very straight forward because ARCH_HAS_TRANSPARENT_HUGEPAGE_PUD is
>>> not explicitly dependent on ARCH_HAS_TRANSPARENT_HUGEPAGE.
>>>
>>> Tested on arm64, x86 platforms but only build tested on all other enabled
>>> platforms through ARCH_HAS_DEBUG_VM_PGTABLE i.e powerpc, arc, s390. The
>>> following failure on arm64 still exists which was mentioned previously. It
>>> will be fixed with the upcoming THP migration on arm64 enablement series.
>>>
>>> WARNING .... mm/debug_vm_pgtable.c:860 debug_vm_pgtable+0x940/0xa54
>>> WARN_ON(!pmd_present(pmd_mkinvalid(pmd_mkhuge(pmd))))
>>>
>>> This series is based on v5.8-rc1.
>>>
>>> Changes in V3:
>>>
>>> - Replaced HAVE_ARCH_SOFT_DIRTY with MEM_SOFT_DIRTY
>>> - Added HAVE_ARCH_HUGE_VMAP checks in pxx_huge_tests() per Gerald
>>> - Updated documentation for pmd_thp_tests() per Zi Yan
>>> - Replaced READ_ONCE() with huge_ptep_get() per Gerald
>>> - Added pte_mkhuge() and masking with PMD_MASK per Gerald
>>> - Replaced pte_same() with holding pfn check in pxx_swap_tests()
>>> - Added documentation for all (#ifdef #else #endif) per Gerald
>>> - Updated pmd_protnone_tests() per Gerald
>>> - Updated HugeTLB PTE creation in hugetlb_advanced_tests() per Gerald
>>> - Replaced [pmd|pud]_mknotpresent() with [pmd|pud]_mkinvalid()
>>> - Added has_transparent_hugepage() check for PMD and PUD tests
>>> - Added a patch which debug prints all individual tests being executed
>>> - Updated documentation for renamed [pmd|pud]_mkinvalid() helpers
>>
>> Hello Gerald/Christophe/Vineet,
>>
>> It would be really great if you could give this series a quick test
>> on s390/ppc/arc platforms respectively. Thank you.
> 
> Thanks Alexander, Gerald and Christophe for testing this out on s390
> and ppc32 platforms. Probably Vineet and Qian (any other volunteers)
> could help us with arc and ppc64 platforms, which I would appreciate.

Tested-by: Vineet Gupta <vgupta at synopsys.com>

Apologies for the delay in getting to this. Works fine on ARC

I have following enabled:

# CONFIG_DEBUG_VM_RB is not set
# CONFIG_DEBUG_VM_PGFLAGS is not set
CONFIG_DEBUG_VM_PGTABLE=y

And this boots fine

NET: Registered protocol family 17
NET: Registered protocol family 15
debug_vm_pgtable: [debug_vm_pgtable         ]: Validating architecture page table
helpers
Warning: unable to open an initial console.
Freeing unused kernel memory: 18840K
This architecture does not have kernel memory protection.
Run /init as init process
  with arguments:
    /init
  with environment:
    HOME=/
    TERM=linux
...
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