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Date: Mon, 18 Mar 2019 16:39:39 -0300
From: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To: Changbin Du <changbin.du@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>, namhyung@...nel.org,
Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Alexei Starovoitov <ast@...nel.org>, rostedt@...dmis.org,
Daniel Borkmann <daniel@...earbox.net>, bpf@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 13/16] perf: free all counts in perf_evsel__exit
Em Sat, Mar 16, 2019 at 04:05:53PM +0800, Changbin Du escreveu:
> Ensure that we have freed all allocated counts for struct perf_evsel.
>
> =================================================================
> ==7494==ERROR: LeakSanitizer: detected memory leaks
>
> Direct leak of 48 byte(s) in 1 object(s) allocated from:
> #0 0x7f0333a89138 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xee138)
> #1 0x5625e5330a5e in zalloc util/util.h:23
> #2 0x5625e5330a9b in perf_counts__new util/counts.c:10
> #3 0x5625e5330ca0 in perf_evsel__alloc_counts util/counts.c:47
> #4 0x5625e520d8e5 in __perf_evsel__read_on_cpu util/evsel.c:1505
Does this backtrace corresponds to this patch? I don't think so, this is
allocating evsel->counts, not evsel->prev_raw_counts.
The fix for this specific one is to call perf_evsel__free_counts() in
perf_evsel__exit(), ok? I'm adding a patch to that effect.
The case for evsel->prev_raw_counts is different, I think this started
in 'perf stat' and ended up moving from evsel->priv handled by 'perf
stat' to a new evsel field, prev_raw_counts, and that was being handled
by the stat code, that would call perf_evsel__free_prev_raw_counts()
before calling perf_evsel__delete(), I think. But I would have to double
check.
If you find some leak where evsel->prev_raw_counts leaks, or if you
determine that by looking at the code, please submit a patch for that
case, ok?
- Arnaldo
> #5 0x5625e517a985 in perf_evsel__read_on_cpu /home/work/linux/tools/perf/util/evsel.h:347
> #6 0x5625e517ad1a in test__openat_syscall_event tests/openat-syscall.c:47
> #7 0x5625e51528e6 in run_test tests/builtin-test.c:358
> #8 0x5625e5152baf in test_and_print tests/builtin-test.c:388
> #9 0x5625e51543fe in __cmd_test tests/builtin-test.c:583
> #10 0x5625e515572f in cmd_test tests/builtin-test.c:722
> #11 0x5625e51c3fb8 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
> #12 0x5625e51c44f7 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
> #13 0x5625e51c48fb in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
> #14 0x5625e51c5069 in main /home/changbin/work/linux/tools/perf/perf.c:520
> #15 0x7f033214d09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
>
> Indirect leak of 72 byte(s) in 1 object(s) allocated from:
> #0 0x7f0333a89138 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xee138)
> #1 0x5625e532560d in zalloc util/util.h:23
> #2 0x5625e532566b in xyarray__new util/xyarray.c:10
> #3 0x5625e5330aba in perf_counts__new util/counts.c:15
> #4 0x5625e5330ca0 in perf_evsel__alloc_counts util/counts.c:47
> #5 0x5625e520d8e5 in __perf_evsel__read_on_cpu util/evsel.c:1505
> #6 0x5625e517a985 in perf_evsel__read_on_cpu /home/work/linux/tools/perf/util/evsel.h:347
> #7 0x5625e517ad1a in test__openat_syscall_event tests/openat-syscall.c:47
> #8 0x5625e51528e6 in run_test tests/builtin-test.c:358
> #9 0x5625e5152baf in test_and_print tests/builtin-test.c:388
> #10 0x5625e51543fe in __cmd_test tests/builtin-test.c:583
> #11 0x5625e515572f in cmd_test tests/builtin-test.c:722
> #12 0x5625e51c3fb8 in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
> #13 0x5625e51c44f7 in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
> #14 0x5625e51c48fb in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
> #15 0x5625e51c5069 in main /home/changbin/work/linux/tools/perf/perf.c:520
> #16 0x7f033214d09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)
>
> Signed-off-by: Changbin Du <changbin.du@...il.com>
> ---
> tools/perf/util/counts.c | 18 ++++++++++++++++++
> tools/perf/util/counts.h | 4 ++++
> tools/perf/util/evsel.c | 2 ++
> tools/perf/util/stat.c | 18 ------------------
> 4 files changed, 24 insertions(+), 18 deletions(-)
>
> diff --git a/tools/perf/util/counts.c b/tools/perf/util/counts.c
> index 03032b410c29..c5715d08b1f9 100644
> --- a/tools/perf/util/counts.c
> +++ b/tools/perf/util/counts.c
> @@ -53,3 +53,21 @@ void perf_evsel__free_counts(struct perf_evsel *evsel)
> perf_counts__delete(evsel->counts);
> evsel->counts = NULL;
> }
> +
> +int perf_evsel__alloc_prev_raw_counts(struct perf_evsel *evsel,
> + int ncpus, int nthreads)
> +{
> + struct perf_counts *counts;
> +
> + counts = perf_counts__new(ncpus, nthreads);
> + if (counts)
> + evsel->prev_raw_counts = counts;
> +
> + return counts ? 0 : -ENOMEM;
> +}
> +
> +void perf_evsel__free_prev_raw_counts(struct perf_evsel *evsel)
> +{
> + perf_counts__delete(evsel->prev_raw_counts);
> + evsel->prev_raw_counts = NULL;
> +}
> diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
> index 0d1050ccc586..b8bdbff586bb 100644
> --- a/tools/perf/util/counts.h
> +++ b/tools/perf/util/counts.h
> @@ -36,4 +36,8 @@ void perf_evsel__reset_counts(struct perf_evsel *evsel);
> int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus, int nthreads);
> void perf_evsel__free_counts(struct perf_evsel *evsel);
>
> +int perf_evsel__alloc_prev_raw_counts(struct perf_evsel *evsel,
> + int ncpus, int nthreads);
> +void perf_evsel__free_prev_raw_counts(struct perf_evsel *evsel);
> +
> #endif /* __PERF_COUNTS_H */
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 3bbf73e979c0..8e0fbe34e5d9 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1294,6 +1294,8 @@ void perf_evsel__exit(struct perf_evsel *evsel)
> assert(evsel->evlist == NULL);
> perf_evsel__free_fd(evsel);
> perf_evsel__free_id(evsel);
> + perf_evsel__free_counts(evsel);
> + perf_evsel__free_prev_raw_counts(evsel);
> perf_evsel__free_config_terms(evsel);
> cgroup__put(evsel->cgrp);
> cpu_map__put(evsel->cpus);
> diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> index 4d40515307b8..6a22842f76d2 100644
> --- a/tools/perf/util/stat.c
> +++ b/tools/perf/util/stat.c
> @@ -136,24 +136,6 @@ static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
> zfree(&evsel->stats);
> }
>
> -static int perf_evsel__alloc_prev_raw_counts(struct perf_evsel *evsel,
> - int ncpus, int nthreads)
> -{
> - struct perf_counts *counts;
> -
> - counts = perf_counts__new(ncpus, nthreads);
> - if (counts)
> - evsel->prev_raw_counts = counts;
> -
> - return counts ? 0 : -ENOMEM;
> -}
> -
> -static void perf_evsel__free_prev_raw_counts(struct perf_evsel *evsel)
> -{
> - perf_counts__delete(evsel->prev_raw_counts);
> - evsel->prev_raw_counts = NULL;
> -}
> -
> static int perf_evsel__alloc_stats(struct perf_evsel *evsel, bool alloc_raw)
> {
> int ncpus = perf_evsel__nr_cpus(evsel);
> --
> 2.19.1
--
- Arnaldo
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