On 18/07/19 07:35, Like Xu wrote:
> If a perf_event creation fails due to any reason of the host perf
> subsystem, it has no chance to log the corresponding event for guest
> which may cause abnormal sampling data in guest result. In debug mode,
> this message helps to understand the state of vPMC and we may not
> limit the number of occurrences but not in a spamming style.
>
> Suggested-by: Joe Perches <joe@xxxxxxxxxxx>
> Signed-off-by: Like Xu <like.xu@xxxxxxxxxxxxxxx>
> ---
> arch/x86/kvm/pmu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
> index aa5a2597305a..cedaa01ceb6f 100644
> --- a/arch/x86/kvm/pmu.c
> +++ b/arch/x86/kvm/pmu.c
> @@ -131,8 +131,8 @@ static void pmc_reprogram_counter(struct kvm_pmc *pmc, u32 type,
> intr ? kvm_perf_overflow_intr :
> kvm_perf_overflow, pmc);
> if (IS_ERR(event)) {
> - printk_once("kvm_pmu: event creation failed %ld\n",
> - PTR_ERR(event));
> + pr_debug_ratelimited("kvm_pmu: event creation failed %ld for pmc->idx = %d\n",
> + PTR_ERR(event), pmc->idx);
> return;
> }
>
>
Queued, thanks.
Paolo
