On Tue, May 11, 2021 at 10:42:05AM +0800, Like Xu wrote:
> + if (pebs) {
> + /*
> + * The non-zero precision level of guest event makes the ordinary
> + * guest event becomes a guest PEBS event and triggers the host
> + * PEBS PMI handler to determine whether the PEBS overflow PMI
> + * comes from the host counters or the guest.
> + *
> + * For most PEBS hardware events, the difference in the software
> + * precision levels of guest and host PEBS events will not affect
> + * the accuracy of the PEBS profiling result, because the "event IP"
> + * in the PEBS record is calibrated on the guest side.
> + */
> + attr.precise_ip = 1;
> + }
You've just destroyed precdist, no?
