diff options
| 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/misc/lkdtm_core.c | |
| parent | 95925c99b9043d52db626645e6ef5ee5f62c97e4 (diff) | |
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/misc/lkdtm_core.c')
| -rw-r--r-- | drivers/misc/lkdtm_core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c index 156a1a07c3db..51decc07eeda 100644 --- a/drivers/misc/lkdtm_core.c +++ b/drivers/misc/lkdtm_core.c @@ -238,6 +238,8 @@ struct crashtype crashtypes[] = { CRASHTYPE(REFCOUNT_ADD_NOT_ZERO_SATURATED), CRASHTYPE(REFCOUNT_DEC_AND_TEST_SATURATED), CRASHTYPE(REFCOUNT_SUB_AND_TEST_SATURATED), + CRASHTYPE(REFCOUNT_TIMING), + CRASHTYPE(ATOMIC_TIMING), CRASHTYPE(USERCOPY_HEAP_SIZE_TO), CRASHTYPE(USERCOPY_HEAP_SIZE_FROM), CRASHTYPE(USERCOPY_HEAP_FLAG_TO), |