linux-kernel - Re: [PATCH 6/9] perf kvm: add min and max stats to display

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Message-ID: <51FF4184.30501@linux.vnet.ibm.com>
Date:	Mon, 05 Aug 2013 14:09:08 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	David Ahern <dsahern@...il.com>
CC:	acme@...stprotocols.net, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Runzhen Wang <runzhen@...ux.vnet.ibm.com>
Subject: Re: [PATCH 6/9] perf kvm: add min and max stats to display

On 08/03/2013 04:05 AM, David Ahern wrote:
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
> Cc: Runzhen Wang <runzhen@...ux.vnet.ibm.com>
> ---
>  tools/perf/builtin-kvm.c |   21 ++++++++++++++++++---
>  1 file changed, 18 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 12f7593..5c6e3cd 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -337,14 +337,19 @@ static void clear_events_cache_stats(struct list_head *kvm_events_cache)
>  	struct list_head *head;
>  	struct kvm_event *event;
>  	unsigned int i;
> +	int j;
> 
>  	for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
>  		head = &kvm_events_cache[i];
>  		list_for_each_entry(event, head, hash_entry) {
>  			/* reset stats for event */
> -			memset(&event->total, 0, sizeof(event->total));
> -			memset(event->vcpu, 0,
> -			       event->max_vcpu * sizeof(*event->vcpu));
> +			event->total.time = 0;
> +			init_stats(&event->total.stats);
> +
> +			for (j = 0; j < event->max_vcpu; ++j) {
> +				event->vcpu[j].time = 0;
> +				init_stats(&event->vcpu[j].stats);
> +			}
>  		}
>  	}
>  }
> @@ -718,6 +723,7 @@ static void print_result(struct perf_kvm_stat *kvm)
>  	char decode[20];
>  	struct kvm_event *event;
>  	int vcpu = kvm->trace_vcpu;
> +	struct kvm_event_stats *kvm_stats;
> 
>  	if (kvm->live) {
>  		puts(CONSOLE_CLEAR);
> @@ -731,6 +737,8 @@ 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("%16s ", "Avg time");
>  	pr_info("\n\n");
> 
> @@ -740,11 +748,18 @@ static void print_result(struct perf_kvm_stat *kvm)
>  		ecount = get_event_count(event, vcpu);
>  		etime = get_event_time(event, vcpu);
> 
> +		if (vcpu == -1)
> +			kvm_stats = &event->total;
> +		else
> +			kvm_stats = &event->vcpu[vcpu];

Can introduce a function to do it like get_event_count()/get_event_time()?

And the min/max value are updated in patch 2, so others look good to me:
Reviewed-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>

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