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authorAndrea Arcangeli <aarcange@redhat.com>2017-10-13 15:57:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-10-13 16:18:32 -0700
commit7ddd8faf4399ab4f4edad5604eab35f8a87caf02 (patch)
tree51d651f20cdf07d8e7f01f8e23e371b5809c352d /scripts
parent064f0e9302af4f4ab5e9dca03a5a77d6bebfd35e (diff)
userfaultfd: selftest: exercise -EEXIST only in background transfer
I was stress testing some backports and with high load, after some time, the latest version of the selftest showed some false positive in connection with the uffdio_copy_retry. This seems to fix it while still exercising -EEXIST in the background transfer once in a while. The fork child will quit after the last UFFDIO_COPY is run, so a repeated UFFDIO_COPY may not return -EEXIST. This change restricts the -EEXIST stress to the background transfer where the memory can't go away from under it. Also updated uffdio_zeropage, so the interface is consistent. Link: http://lkml.kernel.org/r/20171004171541.1495-2-aarcange@redhat.com Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Mike Kravetz <mike.kravetz@oracle.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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