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libperf: Add perf_evlist__for_each_evsel() iterator

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Add a perf_evlist__for_each_evsel() macro to iterate perf_evsel objects
in evlist.

Introduce the perf_evlist__next() function to do that without exposing
'struct perf_evlist' internals.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-48-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2019-07-21 13:24:34 +02:00 committed by Arnaldo Carvalho de Melo
parent 63bd5dfa69
commit 651bf38ce1
3 changed files with 28 additions and 0 deletions
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20
tools/perf/lib/evlist.c
View File

@ -34,3 +34,23 @@ struct perf_evlist *perf_evlist__new(void)
return evlist;
}
struct perf_evsel *
perf_evlist__next(struct perf_evlist *evlist, struct perf_evsel *prev)
{
struct perf_evsel *next;
if (!prev) {
next = list_first_entry(&evlist->entries,
struct perf_evsel,
node);
} else {
next = list_next_entry(prev, node);
}
/* Empty list is noticed here so don't need checking on entry. */
if (&next->node == &evlist->entries)
return NULL;
return next;
}

7
tools/perf/lib/include/perf/evlist.h
View File

@ -13,5 +13,12 @@ LIBPERF_API void perf_evlist__add(struct perf_evlist *evlist,
LIBPERF_API void perf_evlist__remove(struct perf_evlist *evlist,
struct perf_evsel *evsel);
LIBPERF_API struct perf_evlist *perf_evlist__new(void);
LIBPERF_API struct perf_evsel* perf_evlist__next(struct perf_evlist *evlist,
struct perf_evsel *evsel);
#define perf_evlist__for_each_evsel(evlist, pos) \
for ((pos) = perf_evlist__next((evlist), NULL); \
(pos) != NULL; \
(pos) = perf_evlist__next((evlist), (pos)))
#endif /* __LIBPERF_EVLIST_H */

1
tools/perf/lib/libperf.map
View File

@ -17,6 +17,7 @@ LIBPERF_0.0.1 {
perf_evlist__init;
perf_evlist__add;
perf_evlist__remove;
perf_evlist__next;
local:
*;
};