fa6c02315f
We did not have a direct user interface of splitting the compound page backing a THP and there is no need unless we want to expose the THP implementation details to users. Make <debugfs>/split_huge_pages accept a new command to do that. By writing "<pid>,<vaddr_start>,<vaddr_end>" to <debugfs>/split_huge_pages, THPs within the given virtual address range from the process with the given pid are split. It is used to test split_huge_page function. In addition, a selftest program is added to tools/testing/selftests/vm to utilize the interface by splitting PMD THPs and PTE-mapped THPs. This does not change the old behavior, i.e., writing 1 to the interface to split all THPs in the system. Link: https://lkml.kernel.org/r/20210331235309.332292-1-zi.yan@sent.com Signed-off-by: Zi Yan <ziy@nvidia.com> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mika Penttila <mika.penttila@nextfour.com> Cc: Sandipan Das <sandipan@linux.ibm.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
26 lines
401 B
Plaintext
26 lines
401 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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hugepage-mmap
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hugepage-shm
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khugepaged
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map_hugetlb
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map_populate
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thuge-gen
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compaction_test
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mlock2-tests
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mremap_dontunmap
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mremap_test
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on-fault-limit
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transhuge-stress
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protection_keys
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userfaultfd
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mlock-intersect-test
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mlock-random-test
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virtual_address_range
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gup_test
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va_128TBswitch
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map_fixed_noreplace
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write_to_hugetlbfs
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hmm-tests
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local_config.*
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split_huge_page_test
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