On Mon, Oct 24, 2022, Like Xu wrote:
> From: Like Xu <likexu@xxxxxxxxxxx>
>
> Re-reading PERF_CAPABILITIES each time when needed, adding the
> overhead of eimulating RDMSR isn't also meaningless in the grand
> scheme of the test.
>
> Based on this, more helpers for full_writes and lbr_fmt can also
> be added to increase the readability of the test cases.
>
> Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> Signed-off-by: Like Xu <likexu@xxxxxxxxxxx>
> ---
> lib/x86/pmu.c | 3 +++
> lib/x86/pmu.h | 18 +++++++++++++++---
> x86/pmu.c | 2 +-
> x86/pmu_lbr.c | 7 ++-----
> 4 files changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/lib/x86/pmu.c b/lib/x86/pmu.c
> index e8b9ae9..35b7efb 100644
> --- a/lib/x86/pmu.c
> +++ b/lib/x86/pmu.c
> @@ -1,8 +1,11 @@
> #include "pmu.h"
>
> struct cpuid cpuid_10;
> +struct pmu_caps pmu;
>
> void pmu_init(void)
> {
> cpuid_10 = cpuid(10);
> + if (this_cpu_has(X86_FEATURE_PDCM))
> + pmu.perf_cap = rdmsr(MSR_IA32_PERF_CAPABILITIES);
Tabs...
