linux/tools/testing/selftests/vm, branch v4.20

tools/testing/selftests/vm/map_fixed_noreplace.c: add test for MAP_FIXED_NOREPLACE

2018-10-26T23:38:15Z

Add a test for MAP_FIXED_NOREPLACE, based on some code originally by Jann Horn. This would have caught the overlap bug reported by Daniel Micay. I originally suggested to Michal that we create MAP_FIXED_NOREPLACE, but instead of writing a selftest I spent my time bike-shedding whether it should be called MAP_FIXED_SAFE/NOCLOBBER/WEAK/NEW .. mea culpa. Link: http://lkml.kernel.org/r/20181013133929.28653-1-mpe@ellerman.id.au Signed-off-by: Michael Ellerman Reviewed-by: Kees Cook Reviewed-by: Khalid Aziz Acked-by: Michal Hocko Cc: Jann Horn Cc: Andrea Arcangeli Cc: Florian Weimer Cc: John Hubbard Cc: Matthew Wilcox Cc: Abdul Haleem Cc: Joel Stanley Cc: Jason Evans Cc: David Goldblatt Cc: Daniel Micay Cc: Shuah Khan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tools/testing/selftests/vm/gup_benchmark.c: add MAP_HUGETLB option

2018-10-26T23:38:15Z

Add a new option '-H' to the gup benchmark to help understand how hugetlb mapping pages compare with the default. Link: http://lkml.kernel.org/r/20181010195605.10689-6-keith.busch@intel.com Signed-off-by: Keith Busch Reviewed-by: Andrew Morton Cc: Kirill Shutemov Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tools/testing/selftests/vm/gup_benchmark.c: add MAP_SHARED option

2018-10-26T23:38:15Z

Add a new benchmark option, -S, to request MAP_SHARED. This can be used to compare with MAP_PRIVATE, or for files that require this option, like dax. Link: http://lkml.kernel.org/r/20181010195605.10689-5-keith.busch@intel.com Signed-off-by: Keith Busch Reviewed-by: Andrew Morton Cc: Kirill Shutemov Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tools/testing/selftests/vm/gup_benchmark.c: allow user specified file

2018-10-26T23:38:15Z

Allow a user to specify a file to map by adding a new option, '-f', providing a means to test various file backings. If not specified, the benchmark will use a private mapping of /dev/zero, which produces an anonymous mapping as before. [akpm@linux-foundation.org: avoid using comma operator] Link: http://lkml.kernel.org/r/20181010195605.10689-4-keith.busch@intel.com Signed-off-by: Keith Busch Reviewed-by: Andrew Morton Cc: Kirill Shutemov Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

tools/testing/selftests/vm/gup_benchmark.c: fix 'write' flag usage

2018-10-26T23:38:15Z

If the '-w' parameter was provided, the benchmark would exit due to a mssing 'break'. Link: http://lkml.kernel.org/r/20181010195605.10689-3-keith.busch@intel.com Signed-off-by: Keith Busch Acked-by: Kirill A. Shutemov Reviewed-by: Andrew Morton Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm/gup_benchmark.c: add additional pinning methods

2018-10-26T23:38:15Z

Provide new gup benchmark ioctl commands to run different user page pinning methods, get_user_pages_longterm() and get_user_pages(), in addition to the existing get_user_pages_fast(). Link: http://lkml.kernel.org/r/20181010195605.10689-2-keith.busch@intel.com Signed-off-by: Keith Busch Acked-by: Kirill A. Shutemov Reviewed-by: Andrew Morton Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

mm/gup_benchmark.c: time put_page()

2018-10-26T23:38:15Z

We'd like to measure time to unpin user pages, so this adds a second benchmark timer on put_page, separate from get_page. Adding the field breaks this ioctl ABI, but should be okay since this an in-tree kernel selftest. [akpm@linux-foundation.org: add expansion to struct gup_benchmark for future use] Link: http://lkml.kernel.org/r/20181010195605.10689-1-keith.busch@intel.com Signed-off-by: Keith Busch Acked-by: Kirill A. Shutemov Reviewed-by: Andrew Morton Cc: Dave Hansen Cc: Dan Williams Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

userfaultfd: selftest: recycle lock threads first

2018-10-26T23:26:35Z

Now we recycle the uffd servicing threads earlier than the lock threads. It might happen that when the lock thread is still blocked at a pthread mutex lock while the servicing thread has already quitted for the cpu so the lock thread will be blocked forever and hang the test program. To fix the possible race, recycle the lock threads first. This never happens with current missing-only tests, but when I start to run the write-protection tests (the feature is not yet posted upstream) it happens every time of the run possibly because in that new test we'll need to service two page faults for each lock operation. Link: http://lkml.kernel.org/r/20180930074259.18229-4-peterx@redhat.com Signed-off-by: Peter Xu Acked-by: Mike Rapoport Cc: Shuah Khan Cc: Mike Kravetz Cc: Jerome Glisse Cc: Zi Yan Cc: "Kirill A . Shutemov" Cc: Shaohua Li Cc: Andrea Arcangeli Cc: "Dr . David Alan Gilbert" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

userfaultfd: selftest: generalize read and poll

2018-10-26T23:26:35Z

We do very similar things in read and poll modes, but we're copying the codes around. Share the codes properly on reading the message and handling the page fault to make the code cleaner. Meanwhile this solves previous mismatch of behaviors between the two modes on that the old code: - did not check EAGAIN case in read() mode - ignored BOUNCE_VERIFY check in read() mode Link: http://lkml.kernel.org/r/20180930074259.18229-3-peterx@redhat.com Signed-off-by: Peter Xu Acked-by: Mike Rapoport Cc: Shuah Khan Cc: Mike Kravetz Cc: Jerome Glisse Cc: Zi Yan Cc: "Kirill A . Shutemov" Cc: Shaohua Li Cc: Andrea Arcangeli Cc: "Dr . David Alan Gilbert" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

userfaultfd: selftest: cleanup help messages

2018-10-26T23:26:35Z

Firstly, the help in the comment region is obsolete, now we support three parameters. Since at it, change it and move it into the help message of the program. Also, the help messages dumped here and there is obsolete too. Use a single usage() helper. Link: http://lkml.kernel.org/r/20180930074259.18229-2-peterx@redhat.com Signed-off-by: Peter Xu Acked-by: Mike Rapoport Cc: Shuah Khan Cc: Mike Kravetz Cc: Jerome Glisse Cc: Zi Yan Cc: "Kirill A . Shutemov" Cc: Shaohua Li Cc: Andrea Arcangeli Cc: "Dr . David Alan Gilbert" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds