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: default avatarWang 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.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent bcdc09af
...@@ -588,7 +588,11 @@ static char *get_trace_output(struct hist_entry *he) ...@@ -588,7 +588,11 @@ static char *get_trace_output(struct hist_entry *he)
} else { } else {
pevent_event_info(&seq, evsel->tp_format, &rec); 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 static int64_t
......
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