[PATCH 06/11] perf script: Don't disable use_callchain if input is pipe

Arnaldo Carvalho de Melo
2016-08-15T22:02:10Z

From: He Kuang <hekuang@huawei.com>

Because perf data from pipe do not have a header with evsel attr, we
should not check that and disable symbol_conf.use_callchain. Otherwise,
perf script won't show callchains even if the data stream contains
callchain.

Before:
$ perf record -g -o - uname |perf script
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.000 MB - ]
uname 1828 182630.186578: 250000 cpu-clock: ..b9499 setup_arg_pages
uname 1828 182630.186850: 250000 cpu-clock: ..83b20 ___might_sleep
uname 1828 182630.187153: 250000 cpu-clock: ..4b6be file_map_prot_ch
...

After:
$ perf record -g -o - uname |perf script
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.000 MB - ]
uname 1833 182675.927099: 250000 cpu-clock:
ba5520 _raw_spin_lock+0xfe200040 ([kernel.kallsyms])
389dd4 expand_downwards+0xfe200154 ([kernel.kallsyms])
389f34 expand_stack+0xfe200024 ([kernel.kallsyms])
3b957e setup_arg_pages+0xfe20019e ([kernel.kallsyms])
40c80f load_elf_binary+0xfe20042f ([kernel.kallsyms])
...

Signed-off-by: He Kuang <hekuang@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1470309943-153909-2-git-send-email-hekuang@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-script.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 45c51eb6cab4..c859e59dfe3e 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -371,14 +371,16 @@ static int perf_session__check_output_opt(struct perf_session *session)

if (!no_callchain) {
bool use_callchain = false;
+ bool not_pipe = false;

evlist__for_each_entry(session->evlist, evsel) {
+ not_pipe = true;
if (evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) {
use_callchain = true;
break;
}
}
- if (!use_callchain)
+ if (not_pipe && !use_callchain)
symbol_conf.use_callchain = false;
}

--
2.7.4