Peter & Stephane, We are plumbing the POWER8 Branch History Rolling Buffer (BHRB) into struct perf_branch_entry.
Sometimes on POWER8 we may not be able to fill out the "to" address. We initially thought of just making this 0, but it's feasible that this could be a valid address to branch to. The other logical value to indicate an invalid entry would be all 1s which is not possible (on POWER at least). Do you guys have a preference as to what we should use as an invalid entry? This would have some consequences for the userspace tool also. The alternative would be to add a flag alongside mispred/predicted to indicate the validity of the "to" address. Mikey -- 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/
