On Wed, Aug 31, 2022 at 11:23:55AM -0700, Dave Hansen wrote:
On 8/29/22 20:12, Jarkko Sakkinen wrote:
diff --git a/tools/testing/selftests/sgx/alloc-error.bt b/tools/testing/selftests/sgx/alloc-error.bt new file mode 100644 index 000000000000..9268d50dea29 --- /dev/null +++ b/tools/testing/selftests/sgx/alloc-error.bt @@ -0,0 +1,7 @@ +kr:sgx_alloc_epc_page /(uint64)retval >= (uint64)(-4095)/ {
printf("sgx_alloc_epc_page: retval=%d\n", (int64)retval);+}
+kr:sgx_encl_page_alloc /(uint64)retval >= (uint64)(-4095)/ {
printf("sgx_encl_page_alloc: retval=%d\n", (int64)retval);+}
I guess this doesn't _hurt_, but it's also not exactly the easiest way to get this done. You need a whole bpf toolchain. You could also just do:
perf probe 'sgx_encl_page_alloc%return $retval'
Even *that* can be replicated in a few scant lines of shell code echoing into /sys/kernel/debug/tracing.
Thanks, I have not used perf that much. What if I replace this with a shell script using perf? How do you use that for two kretprobes?
BR, Jarkko