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

Ian Rogers
2020-09-15T05:15:36Z

On Mon, Sep 14, 2020 at 8:18 PM Namhyung Kim <namhyung@kernel.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@event\=0x80\,umask\=0x2@ / arb@event\=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@event\\=0x80\\,umask\\=0x2@ / arb@event\\=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@event\=0x80\,umask\=0x2@ /
arb@event\=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
>