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https://github.com/torvalds/linux
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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> |
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| .. | ||
| .gitignore | ||
| charge_reserved_hugetlb.sh | ||
| check_config.sh | ||
| compaction_test.c | ||
| config | ||
| gup_test.c | ||
| hmm-tests.c | ||
| hugepage-mmap.c | ||
| hugepage-shm.c | ||
| hugetlb_reparenting_test.sh | ||
| khugepaged.c | ||
| Makefile | ||
| map_fixed_noreplace.c | ||
| map_hugetlb.c | ||
| map_populate.c | ||
| mlock-random-test.c | ||
| mlock2-tests.c | ||
| mlock2.h | ||
| mremap_dontunmap.c | ||
| mremap_test.c | ||
| on-fault-limit.c | ||
| pkey-helpers.h | ||
| pkey-powerpc.h | ||
| pkey-x86.h | ||
| protection_keys.c | ||
| run_vmtests.sh | ||
| split_huge_page_test.c | ||
| test_hmm.sh | ||
| test_vmalloc.sh | ||
| thuge-gen.c | ||
| transhuge-stress.c | ||
| userfaultfd.c | ||
| va_128TBswitch.c | ||
| virtual_address_range.c | ||
| write_hugetlb_memory.sh | ||
| write_to_hugetlbfs.c | ||