linux-kernel - Re: [PATCH v5 03/12] perf util: Extend rbtree to support shadow stats

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Date:   Sat, 2 Dec 2017 12:40:26 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v5 03/12] perf util: Extend rbtree to support shadow stats



On 12/1/2017 10:10 PM, Arnaldo Carvalho de Melo wrote:
> Em Fri, Dec 01, 2017 at 06:57:27PM +0800, Jin Yao escreveu:
>> Previously the rbtree was used to link generic metrics.
> 
> Try to make the one line subject more descriptive, I'm changing it to:
> 
> perf stat: Extend rbtree to support per-thread shadow stats
> 
> - Arnaldo
>   

Yes, this new subject is better.

Thanks
Jin Yao

>> This patches adds new ctx/type/stat into rbtree keys because we
>> will use this rbtree to maintain shadow metrics to replace original
>> a couple of static arrays for supporting per-thread shadow stats.
>>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   tools/perf/util/stat-shadow.c | 27 +++++++++++++++++++++++++++
>>   1 file changed, 27 insertions(+)
>>
>> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
>> index 5853901..c53b80d 100644
>> --- a/tools/perf/util/stat-shadow.c
>> +++ b/tools/perf/util/stat-shadow.c
>> @@ -45,7 +45,10 @@ struct stats walltime_nsecs_stats;
>>   struct saved_value {
>>   	struct rb_node rb_node;
>>   	struct perf_evsel *evsel;
>> +	enum stat_type type;
>> +	int ctx;
>>   	int cpu;
>> +	struct runtime_stat *stat;
>>   	struct stats stats;
>>   };
>>   
>> @@ -58,6 +61,30 @@ static int saved_value_cmp(struct rb_node *rb_node, const void *entry)
>>   
>>   	if (a->cpu != b->cpu)
>>   		return a->cpu - b->cpu;
>> +
>> +	/*
>> +	 * Previously the rbtree was used to link generic metrics.
>> +	 * The keys were evsel/cpu. Now the rbtree is extended to support
>> +	 * per-thread shadow stats. For shadow stats case, the keys
>> +	 * are cpu/type/ctx/stat (evsel is NULL). For generic metrics
>> +	 * case, the keys are still evsel/cpu (type/ctx/stat are 0 or NULL).
>> +	 */
>> +	if (a->type != b->type)
>> +		return a->type - b->type;
>> +
>> +	if (a->ctx != b->ctx)
>> +		return a->ctx - b->ctx;
>> +
>> +	if (a->evsel == NULL && b->evsel == NULL) {
>> +		if (a->stat == b->stat)
>> +			return 0;
>> +
>> +		if ((char *)a->stat < (char *)b->stat)
>> +			return -1;
>> +
>> +		return 1;
>> +	}
>> +
>>   	if (a->evsel == b->evsel)
>>   		return 0;
>>   	if ((char *)a->evsel < (char *)b->evsel)
>> -- 
>> 2.7.4