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| author |   Kees Cook <keescook@chromium.org> | 2017-07-21 06:19:14 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2017-07-26 14:38:04 -0700 |
| commit | c7fea48876773603721f545f8c1a2f894291ef85 (patch) | |
| tree | 8aec6293f664c8240af323fd017682f64d3b5b64 /drivers/fpga/fpga-region.c | |
| parent | lkdtm: Provide more complete coverage for REFCOUNT tests (diff) | |
| download | wireguard-linux-c7fea48876773603721f545f8c1a2f894291ef85.tar.xz wireguard-linux-c7fea48876773603721f545f8c1a2f894291ef85.zip | |
lkdtm: Provide timing tests for atomic_t vs refcount_t
While not a crash test, this does provide two tight atomic_t and
refcount_t loops for performance comparisons:
cd /sys/kernel/debug/provoke-crash
perf stat -B -- cat <(echo ATOMIC_TIMING) > DIRECT
perf stat -B -- cat <(echo REFCOUNT_TIMING) > DIRECT
Looking a CPU cycles is the best way to example the fast-path (rather
than instruction counts, since conditional jumps will be executed but
will be negligible due to branch-prediction).
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'drivers/fpga/fpga-region.c')
0 files changed, 0 insertions, 0 deletions