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| author | Benjamin Gray <bgray@linux.ibm.com> | 2023-04-06 14:33:18 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2023-04-20 13:21:45 +1000 |
| commit | 3067b89ab62305c54ec15b00a2c4dbaf64809c59 (patch) | |
| tree | 6a0510188657f203925daa32b1f9ffebb5fb8c9d /tools/testing/selftests/powerpc/dscr/dscr.h | |
| parent | fda8158870063b99b88a0904bbb95188973b4297 (diff) | |
| download | linux-next-3067b89ab62305c54ec15b00a2c4dbaf64809c59.tar.gz | |
selftests/powerpc/dscr: Improve DSCR explicit random test case
The tests currently have a single writer thread updating the system
DSCR with a 1/1000 chance looped only 100 times. So only around one in
10 runs actually do anything.
* Add multiple threads to the dscr_explicit_random_test case.
* Use a barrier to make all the threads start work as simultaneously as
possible.
* Use a rwlock and make all threads have a reasonable chance to write to
the DSCR on each iteration.
PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP is used to prevent
writers from starving while all the other threads keep reading.
Logging the reads/writes shows a decent mix across the whole test.
* Allow all threads a chance to write.
* Make the chance of writing more likely.
Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230406043320.125138-6-bgray@linux.ibm.com
Diffstat (limited to 'tools/testing/selftests/powerpc/dscr/dscr.h')
| -rw-r--r-- | tools/testing/selftests/powerpc/dscr/dscr.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/tools/testing/selftests/powerpc/dscr/dscr.h b/tools/testing/selftests/powerpc/dscr/dscr.h index 2c54998d4715..b281659071e8 100644 --- a/tools/testing/selftests/powerpc/dscr/dscr.h +++ b/tools/testing/selftests/powerpc/dscr/dscr.h @@ -86,8 +86,4 @@ void set_default_dscr(unsigned long val) } } -double uniform_deviate(int seed) -{ - return seed * (1.0 / (RAND_MAX + 1.0)); -} #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */ |