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perf evlist: Introduce backward_mmap array for evlist

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Add backward_mmap to evlist, free it together with normal mmap.

Improve perf_evlist__pick_pc(), search backward_mmap if evlist->mmap is
not available.

This patch doesn't alloc this array. It will be allocated conditionally
in the following commits.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan
2016-07-14 08:34:39 +00:00
committed by Arnaldo Carvalho de Melo
parent a1f7261834
commit b2cb615d8a
3 changed files with 16 additions and 7 deletions
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10
tools/perf/builtin-record.c
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@@ -509,7 +509,7 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
if (!evlist)
return 0;
maps = evlist->mmap;
maps = backward ? evlist->backward_mmap : evlist->mmap;
if (!maps)
return 0;
@@ -696,8 +696,12 @@ perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused
static const struct perf_event_mmap_page *
perf_evlist__pick_pc(struct perf_evlist *evlist)
{
if (evlist && evlist->mmap && evlist->mmap[0].base)
return evlist->mmap[0].base;
if (evlist) {
if (evlist->mmap && evlist->mmap[0].base)
return evlist->mmap[0].base;
if (evlist->backward_mmap && evlist->backward_mmap[0].base)
return evlist->backward_mmap[0].base;
}
return NULL;
}