Re: [Patch v2 12/24] perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR

[Peter Zijlstra]

On Wed, Feb 26, 2025 at 02:19:15PM +0800, Mi, Dapeng wrote:
> 
> On 2/25/2025 7:25 PM, Peter Zijlstra wrote:
> > On Tue, Feb 18, 2025 at 03:28:06PM +0000, Dapeng Mi wrote:
> >> Arch-PEBS introduces a new MSR IA32_PEBS_BASE to store the arch-PEBS
> >> buffer physical address. This patch allocates arch-PEBS buffer and then
> >> initialize IA32_PEBS_BASE MSR with the buffer physical address.
> > Just to clarify, parts with ARCH PEBS will not have BTS and thus not
> > have DS?
> 
> No, DS and BTS still exist along with arch-PEBS, only the legacy DS based
> PEBS is unavailable and replaced by arch-PEBS.

Joy. Is anybody still using BTS now that we have PT? I thought PT was
supposed to be the better BTS.