Re: [PATCH v1 0/4] Enable PEBS when only have PEBS via PT w/o DS

[Alexander Shishkin]

You forgot to CC Peter and LKML.

Luwei Kang <luwei.kang@xxxxxxxxx> writes:

> This patchset is purely perf event system changes that to enable the
> PEBS when the system only supports PEBS via Intel PT w/o DS. Currently,
> there don't have such hardware which only supports PEBS via PT w/o DS
> but it is possible in KVM guest. In Tremont Atom platforms, PEBS via
> PT is the only way to enabled PEBS in KVM guest.

I don't understand what this says. If PEBS-via-PT is available and DS is
not available, what happens and why?

Regards,
--
Alex