diff options
| author | Ian Rogers <irogers@google.com> | 2019-10-22 17:53:33 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-06 15:43:05 -0300 |
| commit | 826100a7ce9a659b42140710ebe789d710799048 (patch) | |
| tree | e30e695a0271939508497a0d5573c91c39aa54f7 /tools | |
| parent | a26e47162d7670ddea4f67978ecf848dc23ef671 (diff) | |
| download | linux-826100a7ce9a659b42140710ebe789d710799048.tar.bz2 | |
perf tools: Avoid a malloc() for array events
Use realloc() rather than malloc()+memcpy() to possibly avoid a memory
allocation when appending array elements.
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: bpf@vger.kernel.org
Cc: clang-built-linux@googlegroups.com
Cc: netdev@vger.kernel.org
Link: http://lore.kernel.org/lkml/20191023005337.196160-6-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/parse-events.y | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y index 5863acb34780..ffa1a1b63796 100644 --- a/tools/perf/util/parse-events.y +++ b/tools/perf/util/parse-events.y @@ -689,14 +689,12 @@ array_terms ',' array_term struct parse_events_array new_array; new_array.nr_ranges = $1.nr_ranges + $3.nr_ranges; - new_array.ranges = malloc(sizeof(new_array.ranges[0]) * - new_array.nr_ranges); + new_array.ranges = realloc($1.ranges, + sizeof(new_array.ranges[0]) * + new_array.nr_ranges); ABORT_ON(!new_array.ranges); - memcpy(&new_array.ranges[0], $1.ranges, - $1.nr_ranges * sizeof(new_array.ranges[0])); memcpy(&new_array.ranges[$1.nr_ranges], $3.ranges, $3.nr_ranges * sizeof(new_array.ranges[0])); - free($1.ranges); free($3.ranges); $$ = new_array; } |