> We need to call perf_event_overflow() for the last record of each event.
> It's hard to detect which record is the last record of the event with one
> pass walking.
>
> Also, I'm not sure how much we can save with one pass walking. The
> optimization should only benefit large PEBS. The total
On 3/26/2019 6:24 PM, Andi Kleen wrote:
+ for (at = base; at < top; at += cpuc->pebs_record_size) {
+ u64 pebs_status;
+
+ pebs_status = get_pebs_status(at) & cpuc->pebs_enabled;
+ pebs_status &= mask;
+
+ for_each_set_bit(bit,
> + for (at = base; at < top; at += cpuc->pebs_record_size) {
> + u64 pebs_status;
> +
> + pebs_status = get_pebs_status(at) & cpuc->pebs_enabled;
> + pebs_status &= mask;
> +
> + for_each_set_bit(bit, (unsigned long *)_status, size)
> +
From: Kan Liang
Adaptive PEBS is a new way to report PEBS sampling information. Instead
of a fixed size record for all PEBS events it allows to configure the
PEBS record to only include the information needed. Events can then opt
in to use such an extended record, or stay with a basic record
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