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This test stresses the race between of madvise(DONTNEED), a page fault
and a parallel huge page mmap, which should fail due to lack of
available page available for mapping.
This test case must run on a system with one and only one huge page
available.
# echo 1 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages
During setup, the test allocates the only available page, and starts
three threads:
- thread 1:
* madvise(MADV_DONTNEED) on the allocated huge page
- thread 2:
* Write to the allocated huge page
- thread 3:
* Tries to allocated (steal) an extra huge page (which is not
available)
thread 3 should never succeed in the allocation, since the only huge
page was never unmapped, and should be reserved.
Touching the old page after thread3 allocation will raise a SIGBUS.
Link: https://lkml.kernel.org/r/20240105155419.1939484-2-leitao@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Cc: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
50 lines
756 B
Plaintext
50 lines
756 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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cow
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hugepage-mmap
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hugepage-mremap
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hugepage-shm
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hugepage-vmemmap
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hugetlb-madvise
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hugetlb-read-hwpoison
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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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migration
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mlock2-tests
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mrelease_test
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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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pagemap_ioctl
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*.tmp*
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protection_keys
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protection_keys_32
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protection_keys_64
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madv_populate
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uffd-stress
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uffd-unit-tests
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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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memfd_secret
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soft-dirty
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split_huge_page_test
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ksm_tests
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local_config.h
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local_config.mk
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ksm_functional_tests
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mdwe_test
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gup_longterm
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mkdirty
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va_high_addr_switch
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hugetlb_fault_after_madv
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hugetlb_madv_vs_map
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