linux-kernel - Re: [PATCH v4.1 02/13] perf hist: Save raw

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Date:	Wed, 23 Dec 2015 22:39:12 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH v4.1 02/13] perf hist: Save raw_data/size for tracepoint
 events

Em Thu, Dec 24, 2015 at 10:05:34AM +0900, Namhyung Kim escreveu:
> The raw_data and raw_size fields are to provide tracepoint specific
> information.  They will be used by dynamic sort keys later.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> make a copy of raw_data
> 
>  tools/perf/util/hist.c | 27 +++++++++++++++++++++++++++
>  tools/perf/util/sort.h |  2 ++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 039bb91d0a92..df5567fff986 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -369,6 +369,28 @@ static struct hist_entry *hist_entry__new(struct hist_entry *template,
>  		if (symbol_conf.use_callchain)
>  			callchain_init(he->callchain);
>  
> +		if (he->raw_data) {
> +			void *data = malloc(he->raw_size);

if this is really needed, please use memdup(), I.e.:

			memdup(he->raw_data, he->raw_size);

> +			if (data == NULL) {
> +				map__put(he->ms.map);
> +				if (he->branch_info) {
> +					map__put(he->branch_info->from.map);
> +					map__put(he->branch_info->to.map);
> +					free(he->branch_info);
> +				}
> +				if (he->mem_info) {
> +					map__put(he->mem_info->iaddr.map);
> +					map__put(he->mem_info->daddr.map);
> +				}
> +				free(he->stat_acc);
> +				free(he);
> +				return NULL;
> +			}
> +
> +			memcpy(data, he->raw_data, he->raw_size);
> +			he->raw_data = data;
> +		}
>  		INIT_LIST_HEAD(&he->pairs.node);
>  		thread__get(he->thread);
>  	}
> @@ -487,6 +509,8 @@ struct hist_entry *__hists__add_entry(struct hists *hists,
>  		.branch_info = bi,
>  		.mem_info = mi,
>  		.transaction = sample->transaction,
> +		.raw_data = sample->raw_data,
> +		.raw_size = sample->raw_size,
>  	};
>  
>  	return hists__findnew_entry(hists, &entry, al, sample_self);
> @@ -801,6 +825,8 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
>  			.sym = al->sym,
>  		},
>  		.parent = iter->parent,
> +		.raw_data = sample->raw_data,
> +		.raw_size = sample->raw_size,
>  	};
>  	int i;
>  	struct callchain_cursor cursor;
> @@ -974,6 +1000,7 @@ void hist_entry__delete(struct hist_entry *he)
>  	if (he->srcfile && he->srcfile[0])
>  		free(he->srcfile);
>  	free_callchain(he->callchain);
> +	free(he->raw_data);
>  	free(he);
>  }
>  
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index 86f05e7a5566..d29898708dbd 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -122,6 +122,8 @@ struct hist_entry {
>  	struct branch_info	*branch_info;
>  	struct hists		*hists;
>  	struct mem_info		*mem_info;
> +	void			*raw_data;
> +	u32			raw_size;
>  	struct callchain_root	callchain[0]; /* must be last member */
>  };
>  
> -- 
> 2.6.4
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