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

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Date:	Mon, 05 Aug 2013 10:44:55 -0400
From:	David Ahern <dsahern@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.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 8/5/13 2:09 AM, Xiao Guangrong wrote:
> 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()?

leveraging existing code in builtin-kvm.... ;-) I'll make a function.

David

>
> 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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