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 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
