Re: [PATCH RFC V2 03/10] petf tools: using comm_str to replace comm in hist_entry

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Sun, Sep 10, 2017 at 07:23:16PM -0700, kan.liang@intel.com escreveu:
> From: Kan Liang <kan.liang@intel.com>
> 
> For hist_entry, it only needs comm_str for cmp.

And thinking a bit more, isn't this even a bug fix, as at the time of
that sample that was the comm string associated with that thread?

Frédéric, am I nutz?

- Arnaldo
 
> Signed-off-by: Kan Liang <kan.liang@intel.com>
> ---
>  tools/perf/util/hist.c | 4 ++--
>  tools/perf/util/sort.c | 8 ++++----
>  tools/perf/util/sort.h | 2 +-
>  3 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index e60d8d8..0f00dd9 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -587,7 +587,7 @@ __hists__add_entry(struct hists *hists,
>  	struct namespaces *ns = thread__namespaces(al->thread);
>  	struct hist_entry entry = {
>  		.thread	= al->thread,
> -		.comm = thread__comm(al->thread),
> +		.comm_str = thread__comm_str(al->thread),
>  		.cgroup_id = {
>  			.dev = ns ? ns->link_info[CGROUP_NS_INDEX].dev : 0,
>  			.ino = ns ? ns->link_info[CGROUP_NS_INDEX].ino : 0,
> @@ -944,7 +944,7 @@ iter_add_next_cumulative_entry(struct hist_entry_iter *iter,
>  		.hists = evsel__hists(evsel),
>  		.cpu = al->cpu,
>  		.thread = al->thread,
> -		.comm = thread__comm(al->thread),
> +		.comm_str = thread__comm_str(al->thread),
>  		.ip = al->addr,
>  		.ms = {
>  			.map = al->map,
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index eb3ab90..99ab411 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -114,26 +114,26 @@ static int64_t
>  sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
>  {
>  	/* Compare the addr that should be unique among comm */
> -	return strcmp(comm__str(right->comm), comm__str(left->comm));
> +	return strcmp(right->comm_str, left->comm_str);
>  }
>  
>  static int64_t
>  sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
>  {
>  	/* Compare the addr that should be unique among comm */
> -	return strcmp(comm__str(right->comm), comm__str(left->comm));
> +	return strcmp(right->comm_str, left->comm_str);
>  }
>  
>  static int64_t
>  sort__comm_sort(struct hist_entry *left, struct hist_entry *right)
>  {
> -	return strcmp(comm__str(right->comm), comm__str(left->comm));
> +	return strcmp(right->comm_str, left->comm_str);
>  }
>  
>  static int hist_entry__comm_snprintf(struct hist_entry *he, char *bf,
>  				     size_t size, unsigned int width)
>  {
> -	return repsep_snprintf(bf, size, "%-*.*s", width, width, comm__str(he->comm));
> +	return repsep_snprintf(bf, size, "%-*.*s", width, width, he->comm_str);
>  }
>  
>  struct sort_entry sort_comm = {
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index f36dc49..861cbe7 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -96,7 +96,7 @@ struct hist_entry {
>  	struct he_stat		*stat_acc;
>  	struct map_symbol	ms;
>  	struct thread		*thread;
> -	struct comm		*comm;
> +	const char		*comm_str;
>  	struct namespace_id	cgroup_id;
>  	u64			ip;
>  	u64			transaction;
> -- 
> 2.5.5