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Subject[PATCH] perf annotate: Show group event string for stdio
Date
When we enable the group, for tui/stdio2, the output first
line includes the group event string. While for stdio,
it will show only one event.

For example,

perf record -e cycles,branches ./div
perf annotate --group --stdio

Percent | Source code & Disassembly of div for cycles (44407 samples)
......

The first line doesn't include the event 'branches'.

With this patch, it will show the correct group even string.

perf annotate --group --stdio

Percent | Source code & Disassembly of div for cycles, branches (44407 samples)
......

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/annotate.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 6612c7f..7189768 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1965,6 +1965,7 @@ int symbol__annotate_printf(struct symbol *sym, struct map *map,
u64 len;
int width = symbol_conf.show_total_period ? 12 : 8;
int graph_dotted_len;
+ char buf[512];

filename = strdup(dso->long_name);
if (!filename)
@@ -1977,8 +1978,11 @@ int symbol__annotate_printf(struct symbol *sym, struct map *map,

len = symbol__size(sym);

- if (perf_evsel__is_group_event(evsel))
+ if (perf_evsel__is_group_event(evsel)) {
width *= evsel->nr_members;
+ perf_evsel__group_desc(evsel, buf, sizeof(buf));
+ evsel_name = buf;
+ }

graph_dotted_len = printf(" %-*.*s| Source code & Disassembly of %s for %s (%" PRIu64 " samples)\n",
width, width, symbol_conf.show_total_period ? "Period" :
--
2.7.4
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