perf hists: Trim libtraceevent trace_seq buffers

When we use libtraceevent to format trace event fields into printable
strings to use in hist entries it is important to trim it from the
default 4 KiB it starts with to what is really used, to reduce the
memory footprint, so use realloc(seq.buffer, seq.len + 1) when returning
the seq.buffer formatted with the fields contents.

Reported-and-Tested-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/tip-t3hl7uxmilrkigzmc90rlhk2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 947d21f3839838c433430b01fe52165522f87295..3d3cb8392c86029bb488f737564730e0cd8995bc 100644 (file)
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -588,7 +588,11 @@ static char *get_trace_output(struct hist_entry *he)
        } else {
                pevent_event_info(&seq, evsel->tp_format, &rec);
        }
-       return seq.buffer;
+       /*
+        * Trim the buffer, it starts at 4KB and we're not going to
+        * add anything more to this buffer.
+        */
+       return realloc(seq.buffer, seq.len + 1);
 }
 
 static int64_t