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SubjectRe: [RFD] perf syscall error handling
On 11/10/14, 5:24 AM, Ingo Molnar wrote:
> Programmatic use in user-spaec is very simple - go with my
> initial example, tooling can either just display the error string
> and bail out, or do:
>
> if (unlikely(error)) {
> if (!strcmp(attr->error_str, "x86/bts: BTS not supported by this CPU architecture")) {
> fprintf(stderr, "x86/BTS: No hardware support falling back to branch sampling\n");
> activate_x86_bts_fallback_code();
> goto out;
> }

That makes the exact string content part of the ABI. As I recall ftrace
had a problem with format strings changing and tooling then limiting the
ability to change it.

David


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