linux-kernel - Re: [PATCHSET v2 00/11] perf tools: Fix various memory leaks

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Date:   Mon, 14 Sep 2020 22:15:11 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHSET v2 00/11] perf tools: Fix various memory leaks

On Mon, Sep 14, 2020 at 8:18 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> Hello,
>
> I've found and fixed a bunch of memory leaks during perf pmu and
> metric tests with address sanitizer.  Before this, the tests were
> mostly failed due to the leaks since ASAN makes it return non-zero.
>
> Now I'm seeing no error with ASAN like below:
>
>   $ ./perf test pmu metric
>    9: Parse perf pmu format                                 : Ok
>   10: PMU events                                            :
>   10.1: PMU event table sanity                              : Ok
>   10.2: PMU event map aliases                               : Ok
>   10.3: Parsing of PMU event table metrics                  : Skip (some metrics failed)
>   10.4: Parsing of PMU event table metrics with fake PMUs   : Ok
>   67: Parse and process metrics                             : Ok
>
> The failure in 10.3 seems due to parse errors like below:
>
>   Multiple errors dropping message: unknown term 'filter_opc' for pmu 'uncore_cbox_0'
>   (valid terms: event,edge,inv,umask,cmask,config,config1,config2,name,period,freq,
>                 branch_type,time,call-graph,stack-size,no-inherit,inherit,max-stack,
>                 nr,no-overwrite,overwrite,driver-config,percore,aux-output,aux-sample-size)
>
>
>   Parse event failed metric 'DRAM_Parallel_Reads' id 'arb/event=0x80,umask=0x2,thresh=1/'
>     expr 'arb@...nt\=0x80\,umask\=0x2@ / arb@...nt\=0x80\,umask\=0x2\,thresh\=1@'
>   Error string 'unknown term 'thresh' for pmu 'uncore_arb'' help
>     'valid terms: event,edge,inv,umask,cmask,config,config1,config2,name,period,freq,
>                   branch_type,time,call-graph,stack-size,no-inherit,inherit,max-stack,
>                   nr,no-overwrite,overwrite,driver-config,percore,aux-output,aux-sample-size'

The 10.3 failure seems to be a problem in the skl metric DRAM_Parallel_Reads:
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json?h=perf/core#n319
arb@...nt\\=0x80\\,umask\\=0x2@ / arb@...nt\\=0x80\\,umask\\=0x2\\,thresh\\=1@

The test failure message is:
Parse event failed metric 'DRAM_Parallel_Reads' id
'arb/event=0x80,umask=0x2,thresh=1/' expr
'arb@...nt\=0x80\,umask\=0x2@ /
arb@...nt\=0x80\,umask\=0x2\,thresh\=1@'
Error string 'unknown term 'thresh' for pmu 'uncore_arb'' help 'valid
terms: event,edge,inv,umask,cmask,config,config1,config2,name,period,freq,branch_type,time,call-graph,stack-size,no-inherit,inherit,max-stack,nr,no-overwrite,overwrite,driver-config,percore,aux-output,aux-sample-size'

The 01.org version of this from:
https://download.01.org/perfmon/TMA_Metrics.xlsx
is:
UNC_ARB_TRK_OCCUPANCY.DATA_READ / UNC_ARB_TRK_OCCUPANCY.DATA_READ:c1

It seems that :c1 has been translated into thresh=1 but that thresh
doesn't exist as a format option (just "cmask edge event inv umask"
are present). I wonder if Andi or Jin you could look into this broken
metric?

Thanks,
Ian

> * Changes from v1:
>  - Add 'Acked-by: Jiri'
>
>
> The patches are also available at 'perf/metric-fix-v2' branch on
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>
> Thanks
> Namhyung
>
>
> Namhyung Kim (11):
>   perf metric: Fix some memory leaks
>   perf metric: Fix some memory leaks - part 2
>   perf evlist: Fix cpu/thread map leak
>   perf parse-event: Fix cpu map leaks
>   perf parse-event: Fix memory leak in evsel->unit
>   perf test: Fix memory leaks in parse-metric test
>   perf metric: Release expr_parse_ctx after testing
>   perf metric: Free metric when it failed to resolve
>   perf metric: Do not free metric when failed to resolve
>   perf test: Free aliases for PMU event map aliases test
>   perf test: Free formats for perf pmu parse test
>
>  tools/perf/tests/parse-metric.c | 14 ++++++++-----
>  tools/perf/tests/pmu-events.c   |  5 +++++
>  tools/perf/tests/pmu.c          |  1 +
>  tools/perf/util/evlist.c        | 11 ++++++++---
>  tools/perf/util/metricgroup.c   | 35 +++++++++++++++++++++++----------
>  tools/perf/util/parse-events.c  |  9 +++++++--
>  tools/perf/util/pmu.c           | 13 +++++++++++-
>  tools/perf/util/pmu.h           |  2 ++
>  tools/perf/util/stat-shadow.c   |  8 +++++---
>  9 files changed, 74 insertions(+), 24 deletions(-)
>
> --
> 2.28.0.618.gf4bc123cb7-goog
>