Commit 887fa86d authored Aug 05, 2016 by Arnaldo Carvalho de Melo

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>

parent bcdc09af

tools/perf/util/sort.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -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