Em Fri, Aug 28, 2015 at 05:48:06AM -0400, Kan Liang escreveu:
> From: Arnaldo Carvalho de Melo <[email protected]>
> 
> So that functions that deal primarily with an evsel to access
> information that concerns the whole evlist it is in.

Also already in my perf/core branch.
 
> Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
> Signed-off-by: Kan Liang <[email protected]>
> ---
>  tools/perf/util/evlist.c | 2 ++
>  tools/perf/util/evsel.c  | 2 ++
>  tools/perf/util/evsel.h  | 4 ++++
>  3 files changed, 8 insertions(+)
> 
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 373f65b..a8cc440 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -98,6 +98,7 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
>  
>       evlist__for_each_safe(evlist, n, pos) {
>               list_del_init(&pos->node);
> +             pos->evlist = NULL;
>               perf_evsel__delete(pos);
>       }
>  
> @@ -125,6 +126,7 @@ void perf_evlist__delete(struct perf_evlist *evlist)
>  
>  void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
>  {
> +     entry->evlist = evlist;
>       list_add_tail(&entry->node, &evlist->entries);
>       entry->idx = evlist->nr_entries;
>       entry->tracking = !entry->idx;
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index b096ef7..bac25f4 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -206,6 +206,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
>       evsel->leader      = evsel;
>       evsel->unit        = "";
>       evsel->scale       = 1.0;
> +     evsel->evlist      = NULL;
>       INIT_LIST_HEAD(&evsel->node);
>       INIT_LIST_HEAD(&evsel->config_terms);
>       perf_evsel__object.init(evsel);
> @@ -1026,6 +1027,7 @@ void perf_evsel__close_fd(struct perf_evsel *evsel, int 
> ncpus, int nthreads)
>  void perf_evsel__exit(struct perf_evsel *evsel)
>  {
>       assert(list_empty(&evsel->node));
> +     assert(evsel->evlist == NULL);
>       perf_evsel__free_fd(evsel);
>       perf_evsel__free_id(evsel);
>       perf_evsel__free_config_terms(evsel);
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 93ac6b1..298e6bb 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -60,6 +60,9 @@ struct perf_evsel_config_term {
>  
>  /** struct perf_evsel - event selector
>   *
> + * @evlist - evlist this evsel is in, if it is in one.
> + * @node - To insert it into evlist->entries or in other list_heads, say in
> + *         the event parsing routines.
>   * @name - Can be set to retain the original event name passed by the user,
>   *         so that when showing results in tools such as 'perf stat', we
>   *         show the name used, not some alias.
> @@ -73,6 +76,7 @@ struct perf_evsel_config_term {
>   */
>  struct perf_evsel {
>       struct list_head        node;
> +     struct perf_evlist      *evlist;
>       struct perf_event_attr  attr;
>       char                    *filter;
>       struct xyarray          *fd;
> -- 
> 1.8.3.1
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