Re: [PATCH v1 1/4] perf annotate: create a new hists to manage multiple events samples

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

Em Wed, Aug 16, 2017 at 06:18:33PM +0800, Jin Yao escreveu:
> An issue is found during using perf annotate.
> 
> perf record -e cycles,branches ...
> perf annotate main --stdio
> 
> The result only shows cycles. It should show both cycles and
> branches on the left side. It works with "--group", but need
> this to work even without groups.
> 
> In current design, the hists is per event. So we need a new
> hists to manage the samples for multiple events and use a new
> hist_event data structure to save the map/symbol information
> for per event.

Humm, why do we need another hists? Don't we have one per evsel, don't
we have a evlist from where to get all of those evsels, can't we just
use that to add one column per evsel?

- Arnaldo
 
> Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
> ---
>  tools/perf/builtin-annotate.c | 60 +++++++++++++++++++++++++++++++------------
>  tools/perf/util/annotate.c    |  8 ++++++
>  tools/perf/util/annotate.h    |  4 +++
>  tools/perf/util/sort.c        | 21 +++++++++++++++
>  tools/perf/util/sort.h        | 13 ++++++++++
>  5 files changed, 89 insertions(+), 17 deletions(-)
> 
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 658c920..833866c 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -45,6 +45,7 @@ struct perf_annotate {
>  	bool	   skip_missing;
>  	const char *sym_hist_filter;
>  	const char *cpu_list;
> +	struct hists events_hists;
>  	DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
>  };
>  
> @@ -153,6 +154,7 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
>  	struct hists *hists = evsel__hists(evsel);
>  	struct hist_entry *he;
>  	int ret;
> +	struct hist_event *hevt;
>  
>  	if (ann->sym_hist_filter != NULL &&
>  	    (al->sym == NULL ||
> @@ -177,12 +179,30 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
>  	 */
>  	process_branch_stack(sample->branch_stack, al, sample);
>  
> -	he = hists__add_entry(hists, al, NULL, NULL, NULL, sample, true);
> -	if (he == NULL)
> -		return -ENOMEM;
> +	if (symbol_conf.nr_events == 1) {
> +		he = hists__add_entry(hists, al, NULL, NULL, NULL,
> +				      sample, true);
> +		if (he == NULL)
> +			return -ENOMEM;
> +
> +		ret = hist_entry__inc_addr_samples(he, sample, evsel->idx,
> +						   al->addr);
> +		hists__inc_nr_samples(hists, true);
> +	} else {
> +		he = hists__add_entry(&ann->events_hists, al, NULL,
> +				      NULL, NULL, sample, true);
> +		if (he == NULL)
> +			return -ENOMEM;
> +
> +		hevt = hist_entry__event_add(he, evsel);
> +		if (hevt == NULL)
> +			return -ENOMEM;
> +
> +		ret = hist_event__inc_addr_samples(hevt, sample, hevt->idx,
> +						   al->addr);
> +		hists__inc_nr_samples(&ann->events_hists, true);
> +	}
>  
> -	ret = hist_entry__inc_addr_samples(he, sample, evsel->idx, al->addr);
> -	hists__inc_nr_samples(hists, true);
>  	return ret;
>  }
>  
> @@ -304,7 +324,8 @@ static int __cmd_annotate(struct perf_annotate *ann)
>  	int ret;
>  	struct perf_session *session = ann->session;
>  	struct perf_evsel *pos;
> -	u64 total_nr_samples;
> +	u64 total_nr_samples = 0;
> +	struct hists *hists;
>  
>  	if (ann->cpu_list) {
>  		ret = perf_session__cpu_bitmap(session, ann->cpu_list,
> @@ -335,23 +356,26 @@ static int __cmd_annotate(struct perf_annotate *ann)
>  	if (verbose > 2)
>  		perf_session__fprintf_dsos(session, stdout);
>  
> -	total_nr_samples = 0;
> -	evlist__for_each_entry(session->evlist, pos) {
> -		struct hists *hists = evsel__hists(pos);
> -		u32 nr_samples = hists->stats.nr_events[PERF_RECORD_SAMPLE];
> +	if (symbol_conf.nr_events > 1) {
> +		hists = &ann->events_hists;
> +		total_nr_samples +=
> +			hists->stats.nr_events[PERF_RECORD_SAMPLE];
> +
> +		hists__collapse_resort(hists, NULL);
> +		hists__output_resort(hists, NULL);
> +		hists__find_annotations(hists, NULL, ann);
> +	} else {
> +		evlist__for_each_entry(session->evlist, pos) {
> +			hists = evsel__hists(pos);
> +			total_nr_samples +=
> +				hists->stats.nr_events[PERF_RECORD_SAMPLE];
>  
> -		if (nr_samples > 0) {
> -			total_nr_samples += nr_samples;
>  			hists__collapse_resort(hists, NULL);
>  			/* Don't sort callchain */
>  			perf_evsel__reset_sample_bit(pos, CALLCHAIN);
>  			perf_evsel__output_resort(pos, NULL);
> -
> -			if (symbol_conf.event_group &&
> -			    !perf_evsel__is_group_leader(pos))
> -				continue;
> -
>  			hists__find_annotations(hists, pos, ann);
> +			break;
>  		}
>  	}
>  
> @@ -486,6 +510,8 @@ int cmd_annotate(int argc, const char **argv)
>  	if (ret < 0)
>  		goto out_delete;
>  
> +	__hists__init(&annotate.events_hists, &perf_hpp_list);
> +
>  	if (setup_sorting(NULL) < 0)
>  		usage_with_options(annotate_usage, options);
>  
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 2dab0e5..16ec881 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -828,6 +828,14 @@ int hist_entry__inc_addr_samples(struct hist_entry *he, struct perf_sample *samp
>  	return symbol__inc_addr_samples(he->ms.sym, he->ms.map, evidx, ip, sample);
>  }
>  
> +int hist_event__inc_addr_samples(struct hist_event *hevt,
> +				 struct perf_sample *sample,
> +				 int idx, u64 ip)
> +{
> +	return symbol__inc_addr_samples(hevt->ms.sym, hevt->ms.map,
> +					idx, ip, sample);
> +}
> +
>  static void disasm_line__init_ins(struct disasm_line *dl, struct arch *arch, struct map *map)
>  {
>  	dl->ins.ops = ins__find(arch, dl->ins.name);
> diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
> index 9ce575c..0d44cfe 100644
> --- a/tools/perf/util/annotate.h
> +++ b/tools/perf/util/annotate.h
> @@ -165,6 +165,10 @@ int addr_map_symbol__account_cycles(struct addr_map_symbol *ams,
>  int hist_entry__inc_addr_samples(struct hist_entry *he, struct perf_sample *sample,
>  				 int evidx, u64 addr);
>  
> +int hist_event__inc_addr_samples(struct hist_event *hevt,
> +				 struct perf_sample *sample,
> +				 int idx, u64 addr);
> +
>  int symbol__alloc_hist(struct symbol *sym);
>  void symbol__annotate_zero_histograms(struct symbol *sym);
>  
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 12359bd..1500a8e 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -1490,6 +1490,27 @@ struct sort_entry sort_sym_size = {
>  	.se_width_idx	= HISTC_SYM_SIZE,
>  };
>  
> +struct hist_event *hist_entry__event_add(struct hist_entry *he,
> +					 struct perf_evsel *evsel)
> +{
> +	int i;
> +
> +	for (i = 0; i < he->event_nr; i++) {
> +		if (he->events[i].evsel == evsel)
> +			return &he->events[i];
> +	}
> +
> +	if (i < HIST_ENTRY_EVENTS) {
> +		memset(&he->events[i], 0, sizeof(struct hist_event));
> +		memcpy(&he->events[i].ms, &he->ms, sizeof(struct map_symbol));
> +		he->events[i].evsel = evsel;
> +		he->events[i].idx = i;
> +		he->event_nr++;
> +		return &he->events[i];
> +	}
> +
> +	return NULL;
> +}
>  
>  struct sort_dimension {
>  	const char		*name;
> diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
> index b7c7559..446a2a3 100644
> --- a/tools/perf/util/sort.h
> +++ b/tools/perf/util/sort.h
> @@ -79,6 +79,14 @@ struct hist_entry_ops {
>  	void	(*free)(void *ptr);
>  };
>  
> +#define HIST_ENTRY_EVENTS	8
> +
> +struct hist_event {
> +	struct map_symbol	ms;
> +	struct perf_evsel	*evsel;
> +	int			idx;
> +};
> +
>  /**
>   * struct hist_entry - histogram entry
>   *
> @@ -95,6 +103,8 @@ struct hist_entry {
>  	struct he_stat		stat;
>  	struct he_stat		*stat_acc;
>  	struct map_symbol	ms;
> +	struct hist_event	events[HIST_ENTRY_EVENTS];
> +	int			event_nr;
>  	struct thread		*thread;
>  	struct comm		*comm;
>  	struct namespace_id	cgroup_id;
> @@ -291,4 +301,7 @@ sort__daddr_cmp(struct hist_entry *left, struct hist_entry *right);
>  int64_t
>  sort__dcacheline_cmp(struct hist_entry *left, struct hist_entry *right);
>  char *hist_entry__get_srcline(struct hist_entry *he);
> +struct hist_event *hist_entry__event_add(struct hist_entry *he,
> +					 struct perf_evsel *evsel);
> +
>  #endif	/* __PERF_SORT_H */
> -- 
> 2.7.4