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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-08-05 12:37:21 -03:00
parent bcdc09af3e
commit 887fa86d6f
1 changed files with 5 additions and 1 deletions
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6
tools/perf/util/sort.c
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@ -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