linux-kernel - Re: [PATCH v6 4/7] perf util: Link stream pair

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Message-ID: <20200917202354.GE1431236@kernel.org>
Date:   Thu, 17 Sep 2020 17:23:54 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jin Yao <yao.jin@...ux.intel.com>
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 v6 4/7] perf util: Link stream pair

Em Fri, Sep 11, 2020 at 04:03:50PM +0800, Jin Yao escreveu:
> In previous patch, we have created an evsel_streams for one event,
> and top N hottest streams will be saved in a stream array in
> evsel_streams.
> 
> This patch compares total streams among two evsel_streams.
> 
> Once two streams are fully matched, they will be linked as
> a pair. From the pair, we can know which streams are matched.
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  v6:
>    - Rebase to perf/core
> 
>  v5:
>    - Remove enum stream_type
> 
>  v4:
>    - New patch in v4.
> 
>  tools/perf/util/stream.c | 40 ++++++++++++++++++++++++++++++++++++++++
>  tools/perf/util/stream.h |  4 ++++
>  2 files changed, 44 insertions(+)
> 
> diff --git a/tools/perf/util/stream.c b/tools/perf/util/stream.c
> index 7882a7f05d97..e96e21d6e07b 100644
> --- a/tools/perf/util/stream.c
> +++ b/tools/perf/util/stream.c
> @@ -157,3 +157,43 @@ struct evsel_streams *evsel_streams_get(struct evsel_streams *es,
>  
>  	return NULL;
>  }
> +
> +static struct stream *stream_callchain_match(struct stream *base_stream,
> +					     struct evsel_streams *es_pair)

Please use stream__

> +{
> +	for (int i = 0; i < es_pair->nr_streams; i++) {
> +		struct stream *pair_stream = &es_pair->streams[i];
> +
> +		if (callchain_cnode_matched(base_stream->cnode,
> +					    pair_stream->cnode)) {
> +			return pair_stream;
> +		}
> +	}
> +
> +	return NULL;
> +}
> +
> +static struct stream *stream_match(struct stream *base_stream,
> +				   struct evsel_streams *es_pair)
> +{
> +	return stream_callchain_match(base_stream, es_pair);
> +}
> +
> +static void stream_link(struct stream *base_stream, struct stream *pair_stream)
> +{
> +	base_stream->pair_cnode = pair_stream->cnode;
> +	pair_stream->pair_cnode = base_stream->cnode;
> +}
> +
> +void match_evsel_streams(struct evsel_streams *es_base,
> +			 struct evsel_streams *es_pair)
> +{
> +	for (int i = 0; i < es_base->nr_streams; i++) {
> +		struct stream *base_stream = &es_base->streams[i];
> +		struct stream *pair_stream;
> +
> +		pair_stream = stream_match(base_stream, es_pair);
> +		if (pair_stream)
> +			stream_link(base_stream, pair_stream);
> +	}
> +}
> diff --git a/tools/perf/util/stream.h b/tools/perf/util/stream.h
> index 66f61d954eef..2eb6f17a834e 100644
> --- a/tools/perf/util/stream.h
> +++ b/tools/perf/util/stream.h
> @@ -6,6 +6,7 @@
>  
>  struct stream {
>  	struct callchain_node	*cnode;
> +	struct callchain_node	*pair_cnode;
>  };
>  
>  struct evsel_streams {
> @@ -23,4 +24,7 @@ struct evsel_streams *perf_evlist__create_streams(struct evlist *evlist,
>  struct evsel_streams *evsel_streams_get(struct evsel_streams *es,
>  					int nr_evsel, int evsel_idx);
>  
> +void match_evsel_streams(struct evsel_streams *es_base,
> +			 struct evsel_streams *es_pair);
> +
>  #endif /* __PERF_STREAM_H */
> -- 
> 2.17.1
> 

-- 

- Arnaldo