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Gabriel Krisman Bertazi
authored
This introduces three tests: 1) Sanity check soft dirty basic semantics: allocate area, clean, dirty, check if the SD bit is flipped. 2) Check VMA reuse: validate the VM_SOFTDIRTY usage 3) Check soft-dirty on huge pages This was motivated by Will Deacon's fix commit 912efa17 ("mm: proc: Invalidate TLB after clearing soft-dirty page state"). I was tracking the same issue that he fixed, and this test would have caught it. Cc: Will Deacon <will@kernel.org> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com> --- Andrew has dropped the V3 of this patch. Changes in V5: - Correct indentation of macros - Tested by reverting 912efa17 and one sub test failed - Updated the writing values to the memory and added a comment Changes in V4: Cosmetic changes Removed global variables Replaced ksft_print_msg with ksft_exit_fail_msg to exit the program at once Some other minor changes Correct the authorship of the patch Tests of soft dirty bit in this patch and in madv_populate.c are non-overlapping. madv_populate.c has only one soft-dirty bit test in the context of different advise (MADV_POPULATE_READ and MADV_POPULATE_WRITE). This new test adds more tests. Tab width of 8 has been used to align the macros. This alignment may look odd in shell or email. But it looks alright in editors. Test output: TAP version 13 1..5 ok 1 Test test_simple ok 2 Test test_vma_reuse reused memory location ok 3 Test test_vma_reuse dirty bit of previous page ok 4 Test test_hugepage huge page allocation ok 5 Test test_hugepage huge page dirty bit # Totals: pass:5 fail:0 xfail:0 xpass:0 skip:0 error:0 Or TAP version 13 1..5 ok 1 Test test_simple ok 2 Test test_vma_reuse reused memory location ok 3 Test test_vma_reuse dirty bit of previous page ok 4 # SKIP Test test_hugepage huge page allocation ok 5 # SKIP Test test_hugepage huge page dirty bit # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:2 error:0 Changes in V3: Move test to selftests/vm Use kselftest macros Minor updates to make code more maintainable Add configurations in config file V2 of this patch: https://lore.kernel.org/lkml/20210603151518.2437813-1-krisman@collabora.com/
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