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perf mmap: Use the stored data in perf_mmap__read_event()

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Using the 'start', 'end' and 'overwrite' which are stored in
struct perf_mmap to replace the parameters of perf_mmap__read_event().
The parameters will be discarded later.

No functional change.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1520350567-80082-4-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2018-03-06 10:36:03 -05:00 committed by Arnaldo Carvalho de Melo
parent 07a9461da6
commit b9de0f6e50
1 changed files with 8 additions and 10 deletions
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18
tools/perf/util/mmap.c
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@ -76,8 +76,9 @@ static union perf_event *perf_mmap__read(struct perf_mmap *map,
* perf_mmap__read_done()
*/
union perf_event *perf_mmap__read_event(struct perf_mmap *map,
bool overwrite,
u64 *startp, u64 end)
bool overwrite __maybe_unused,
u64 *startp __maybe_unused,
u64 end __maybe_unused)
{
union perf_event *event;
@ -87,17 +88,14 @@ union perf_event *perf_mmap__read_event(struct perf_mmap *map,
if (!refcount_read(&map->refcnt))
return NULL;
if (startp == NULL)
return NULL;
/* non-overwirte doesn't pause the ringbuffer */
if (!overwrite)
end = perf_mmap__read_head(map);
if (!map->overwrite)
map->end = perf_mmap__read_head(map);
event = perf_mmap__read(map, startp, end);
event = perf_mmap__read(map, &map->start, map->end);
if (!overwrite)
map->prev = *startp;
if (!map->overwrite)
map->prev = map->start;
return event;
}