On 14/11/2022 8:46 pm, Peter Zijlstra wrote:
On Wed, Nov 09, 2022 at 04:28:02PM +0800, Like Xu wrote:
From: Like Xu <likexu@xxxxxxxxxxx>
According to Intel SDM, the EPT-friendly PEBS is supported by all the
platforms after ICX, ADL and the future platforms with PEBS format 5.
Currently the only in-kernel user of this capability is KVM, which has
very limited support for hybrid core pmu, so ADL and its successors do
not currently expose this capability. When both hybrid core and PEBS
format 5 are present, KVM will decide on its own merits.
Oh right; the whole ADL KVM trainwreck :/ What's the plan there?
As we know, our community doesn't really have a plan in terms of feature reception,
considering hyprid pmu doesn't have market share in the data center (where most KVM
users are, and the test farms), and KVM-based client hypervisor will actively
control the
cpu that the KVM module initializes, and adds more trainwreck, so as of now I don't
have a timeline for vPMU on ADL+ (until there are noteworthy user complaints).
Please let me know if you and Kan have other input.
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: linux-perf-users@xxxxxxxxxxxxxxx
Suggested-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
Nit: This change is proposed to be applied via the KVM tree.
Works for me;
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
