On Fri, 31 Oct, at 10:27:13AM, Ingo Molnar wrote: > > - user-space gets back the regular errno (-EOPNOTSUPP or -ENOSYS > or -EINVAL, etc.) and a string. Strings are really the most > helpful information, because tools can just print that. They > can also match on specific strings and programmatically react > to them if they want to: we can promise to not arbitrarily > change error strings once they are introduced. (but even if > they change, user-space can still print them out.)
I guess we'd run into a problem if userspace doesn't want to just print the kernel string but instead wants to parse it in some fashion. That may or may not be a problem in practice, Vince can probably comment on that. I'm just thinking along the lines of making the perf syscall interface as useful as possible for tools other than tools/perf. -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
