From 43b49c16302f104732df5f27e537fa36a327c251 Mon Sep 17 00:00:00 2001 From: Ian Rogers Date: Tue, 6 Aug 2024 23:51:36 -0700 Subject: [PATCH] perf hist: Fix reference counting of branch_info iter_finish_branch_entry() doesn't put the branch_info from/to map elements creating memory leaks. This can be seen with: ``` $ perf record -e cycles -b perf test -w noploop $ perf report -D ... Direct leak of 984344 byte(s) in 123043 object(s) allocated from: #0 0x7fb2654f3bd7 in malloc libsanitizer/asan/asan_malloc_linux.cpp:69 #1 0x564d3400d10b in map__get util/map.h:186 #2 0x564d3400d10b in ip__resolve_ams util/machine.c:1981 #3 0x564d34014d81 in sample__resolve_bstack util/machine.c:2151 #4 0x564d34094790 in iter_prepare_branch_entry util/hist.c:898 #5 0x564d34098fa4 in hist_entry_iter__add util/hist.c:1238 #6 0x564d33d1f0c7 in process_sample_event tools/perf/builtin-report.c:334 #7 0x564d34031eb7 in perf_session__deliver_event util/session.c:1655 #8 0x564d3403ba52 in do_flush util/ordered-events.c:245 #9 0x564d3403ba52 in __ordered_events__flush util/ordered-events.c:324 #10 0x564d3402d32e in perf_session__process_user_event util/session.c:1708 #11 0x564d34032480 in perf_session__process_event util/session.c:1877 #12 0x564d340336ad in reader__read_event util/session.c:2399 #13 0x564d34033fdc in reader__process_events util/session.c:2448 #14 0x564d34033fdc in __perf_session__process_events util/session.c:2495 #15 0x564d34033fdc in perf_session__process_events util/session.c:2661 #16 0x564d33d27113 in __cmd_report tools/perf/builtin-report.c:1065 #17 0x564d33d27113 in cmd_report tools/perf/builtin-report.c:1805 #18 0x564d33e0ccb7 in run_builtin tools/perf/perf.c:350 #19 0x564d33e0d45e in handle_internal_command tools/perf/perf.c:403 #20 0x564d33cdd827 in run_argv tools/perf/perf.c:447 #21 0x564d33cdd827 in main tools/perf/perf.c:561 ... ``` Clearing up the map_symbols properly creates maps reference count issues so resolve those. Resolving this issue doesn't improve peak heap consumption for the test above. Committer testing: $ sudo dnf install libasan $ make -k CORESIGHT=1 EXTRA_CFLAGS="-fsanitize=address" CC=clang O=/tmp/build/$(basename $PWD)/ -C tools/perf install-bin Reviewed-by: Kan Liang Signed-off-by: Ian Rogers Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Sun Haiyong Cc: Yanteng Si Link: https://lore.kernel.org/r/20240807065136.1039977-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/hist.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index f8ee1cd6929d82..c8c1b511f8a747 100644 --- a/tools/perf/util/hist.c +++ b/tools/perf/util/hist.c @@ -472,7 +472,9 @@ static int hist_entry__init(struct hist_entry *he, memcpy(he->branch_info, template->branch_info, sizeof(*he->branch_info)); + he->branch_info->from.ms.maps = maps__get(he->branch_info->from.ms.maps); he->branch_info->from.ms.map = map__get(he->branch_info->from.ms.map); + he->branch_info->to.ms.maps = maps__get(he->branch_info->to.ms.maps); he->branch_info->to.ms.map = map__get(he->branch_info->to.ms.map); } @@ -970,10 +972,21 @@ iter_add_next_branch_entry(struct hist_entry_iter *iter, struct addr_location *a return err; } +static void branch_info__exit(struct branch_info *bi) +{ + map_symbol__exit(&bi->from.ms); + map_symbol__exit(&bi->to.ms); + zfree_srcline(&bi->srcline_from); + zfree_srcline(&bi->srcline_to); +} + static int iter_finish_branch_entry(struct hist_entry_iter *iter, struct addr_location *al __maybe_unused) { + for (int i = 0; i < iter->total; i++) + branch_info__exit(&iter->bi[i]); + zfree(&iter->bi); iter->he = NULL; @@ -1319,10 +1332,7 @@ void hist_entry__delete(struct hist_entry *he) map_symbol__exit(&he->ms); if (he->branch_info) { - map_symbol__exit(&he->branch_info->from.ms); - map_symbol__exit(&he->branch_info->to.ms); - zfree_srcline(&he->branch_info->srcline_from); - zfree_srcline(&he->branch_info->srcline_to); + branch_info__exit(he->branch_info); zfree(&he->branch_info); }