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| author | Gustavo Luiz Duarte <gustavold@linux.ibm.com> | 2020-02-11 00:38:30 -0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-03-20 13:10:23 +1100 |
| commit | 915b7f6f9a5e232c138bb36743a1fdb0fcf2c432 (patch) | |
| tree | 65b8ecdd53bfe3b45e85be24de2d511a1cd59210 /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | 61da50b76b62fd815aa82d853bf82bf4f69568f5 (diff) | |
selftests/powerpc: Add tm-signal-pagefault test
This test triggers a TM Bad Thing by raising a signal in transactional state
and forcing a pagefault to happen in kernelspace when the kernel signal
handling code first touches the user signal stack.
This is inspired by the test tm-signal-context-force-tm but uses userfaultfd to
make the test deterministic. While this test always triggers the bug in one
run, I had to execute tm-signal-context-force-tm several times (the test runs
5000 times each execution) to trigger the same bug.
tm-signal-context-force-tm is kept instead of replaced because, while this test
is more reliable and triggers the same bug, tm-signal-context-force-tm has a
better coverage, in the sense that by running the test several times it might
trigger the pagefault and/or be preempted at different places.
v3: skip test if userfaultfd is unavailable.
Signed-off-by: Gustavo Luiz Duarte <gustavold@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200211033831.11165-2-gustavold@linux.ibm.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions