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| author | Andrea Arcangeli <aarcange@redhat.com> | 2017-10-13 15:57:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-10-13 16:18:32 -0700 |
| commit | 7ddd8faf4399ab4f4edad5604eab35f8a87caf02 (patch) | |
| tree | 51d651f20cdf07d8e7f01f8e23e371b5809c352d /mm/slab.c | |
| parent | 064f0e9302af4f4ab5e9dca03a5a77d6bebfd35e (diff) | |
| download | linux-7ddd8faf4399ab4f4edad5604eab35f8a87caf02.tar.bz2 | |
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>
Diffstat (limited to 'mm/slab.c')
0 files changed, 0 insertions, 0 deletions