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authorArnaldo Carvalho de Melo <acme@redhat.com>2016-08-05 12:37:21 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-08-09 10:46:56 -0300
commit887fa86d6fd7a45cee2d0f9d5f75026786d61df2 (patch)
tree8aaaa2152b4607a5fe2ef885785d8d6a56d9d186 /tools
parentbcdc09af3ef30ef071677544ce23a1c8873a2dda (diff)
downloadlinux-stericsson-887fa86d6fd7a45cee2d0f9d5f75026786d61df2.tar.gz
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/sort.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 947d21f38398..3d3cb8392c86 100644
--- 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