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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-04-09 22:09:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-27 09:09:32 +0200 |
| commit | 702db976b8574745b20492fc2a89abfa4ec2bef1 (patch) | |
| tree | a29c0057c63596315c6bb08f7a684a1af57e3aca /tools/perf/scripts/python/bin | |
| parent | 859d615b5be1a6123b68f08233e548ee7f4e4298 (diff) | |
s390/mm: fix CMMA vs KSM vs others
commit a8f60d1fadf7b8b54449fcc9d6b15248917478ba upstream.
On heavy paging with KSM I see guest data corruption. Turns out that
KSM will add pages to its tree, where the mapping return true for
pte_unused (or might become as such later). KSM will unmap such pages
and reinstantiate with different attributes (e.g. write protected or
special, e.g. in replace_page or write_protect_page)). This uncovered
a bug in our pagetable handling: We must remove the unused flag as
soon as an entry becomes present again.
Signed-of-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools/perf/scripts/python/bin')
0 files changed, 0 insertions, 0 deletions