From: Andi Kleen <[email protected]> Use the existing weight reporting facility to report the transaction abort cost, that is the number of cycles wasted in aborts. Haswell reports this in the PEBS record.
This was in fact the original user for weight. This is a very useful sort key to concentrate on the most costly aborts and a good metric for TSX tuning. Signed-off-by: Andi Kleen <[email protected]> --- arch/x86/kernel/cpu/perf_event_intel_ds.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 3065c57..8959cc7 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -838,6 +838,12 @@ static void __intel_pmu_pebs_event(struct perf_event *event, x86_pmu.intel_cap.pebs_format >= 1) data.addr = pebs->dla; + if ((event->attr.sample_type & PERF_SAMPLE_WEIGHT) && + !fll && + (x86_pmu.intel_cap.pebs_format >= 2) && + pebs_hsw->tsx_tuning) + data.weight = pebs_hsw->tsx_tuning & 0xffffffff; + if (has_branch_stack(event)) data.br_stack = &cpuc->lbr_stack; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
