On Wed, Nov 05, 2014 at 03:53:34PM +0000, Liang, Kan wrote: > > I don't think it would be very hard to modify the patch set to make that 3rd > > mode visible. Just need to make that new PERF_RECORD_* type visible to > > user and modify the compatibility checks. > > It's not hard. But LBR is not an independent callchain options. It's better > to be > a supplement of FP. Otherwise, it may confuse the user. He enables the > BRANCH_CALL_STACK, but the data is partly or even not at all from hardware.
What the user sees is up to userspace. It should not be forced by the kernel/user interface. -- 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/
