On Thu, Dec 03, 2015 at 01:22:20PM -0800, Andi Kleen wrote: > + /* > + * On some CPUs the PEBS status can be zero when PEBS is > + * racing with clearing of GLOBAL_STATUS. > + * > + * Normally we would drop that record, but in the > + * case when there is only a single active PEBS event > + * we can assume it's for that event. > + */ > + if (!pebs_status && cpuc->pebs_enabled && > + !(cpuc->pebs_enabled & (cpuc->pebs_enabled-1))) > + pebs_status = cpuc->pebs_enabled; > + > bit = find_first_bit((unsigned long *)&pebs_status, > x86_pmu.max_pebs_events); > if (bit >= x86_pmu.max_pebs_events)
Ah! I think this is the comment I just asked for. -- 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/
