linux-kernel - Re: [PATCH/RFC] KVM: perf/stat: Properly show submicrosecond times

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Date:	Thu, 31 Jul 2014 08:24:03 -0600
From:	David Ahern <dsahern@...il.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>,
	Jiri Olsa <jolsa@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Subject: Re: [PATCH/RFC] KVM: perf/stat: Properly show submicrosecond times

On 7/31/14, 5:13 AM, Christian Borntraeger wrote:
> For lots of exits the min time (and sometimes max) is 0 or 1. Lets
> increase the accurancy similar to what the average field alread does.

Seems reasonable to me.

Acked-by: David Ahern <dsahern@...il.com>


>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
>
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>   tools/perf/builtin-kvm.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 43367eb..fe92dfd 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -592,8 +592,8 @@ static void print_result(struct perf_kvm_stat *kvm)
>   	pr_info("%9s ", "Samples%");
>
>   	pr_info("%9s ", "Time%");
> -	pr_info("%10s ", "Min Time");
> -	pr_info("%10s ", "Max Time");
> +	pr_info("%11s ", "Min Time");
> +	pr_info("%11s ", "Max Time");
>   	pr_info("%16s ", "Avg time");
>   	pr_info("\n\n");
>
> @@ -610,8 +610,8 @@ static void print_result(struct perf_kvm_stat *kvm)
>   		pr_info("%10llu ", (unsigned long long)ecount);
>   		pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
>   		pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
> -		pr_info("%8" PRIu64 "us ", min / 1000);
> -		pr_info("%8" PRIu64 "us ", max / 1000);
> +		pr_info("%9.2fus ", (double)min / 1e3);
> +		pr_info("%9.2fus ", (double)max / 1e3);
>   		pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
>   			kvm_event_rel_stddev(vcpu, event));
>   		pr_info("\n");
>

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