From: Ian Rogers <irogers@google.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>,
Namhyung Kim <namhyung@kernel.org>,
John Garry <john.garry@huawei.com>,
Kajol Jain <kjain@linux.ibm.com>,
"Paul A . Clarke" <pc@us.ibm.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Riccardo Mancini <rickyman7@gmail.com>,
Kan Liang <kan.liang@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
Vineet Singh <vineet.singh@intel.com>,
James Clark <james.clark@arm.com>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>, Leo Yan <leo.yan@linaro.org>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
eranian@google.com
Subject: Re: [PATCH 03/22] perf stat: Switch aggregation to use for_each loop
Date: Mon, 13 Dec 2021 08:17:07 -0800 [thread overview]
Message-ID: <CAP-5=fVy6LysuDLWRNgWZocfAs=khzdK_aOG7HYVs2E_a4Bpzg@mail.gmail.com> (raw)
In-Reply-To: <YbT7Bg3KA/re1HAF@krava>
On Sat, Dec 11, 2021 at 11:25 AM Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Tue, Dec 07, 2021 at 06:45:48PM -0800, Ian Rogers wrote:
> > Tidy up the use of cpu and index to hopefully make the code less error
> > prone. Avoid unused warnings with (void) which will be removed in a
> > later patch.
> >
> > In aggr_update_shadow, the perf_cpu_map is switched from
> > the evlist to the counter's cpu map, so the index is appropriate. This
> > addresses a problem where uncore counts, with a cpumap like:
> > $ cat /sys/devices/uncore_imc_0/cpumask
> > 0,18
> > Don't aggregate counts in CPUs based on the index of those values in the
> > cpumap (0 and 1) but on the actual CPU (0 and 18). Thereby correcting
> > metric calculations in per-socket mode for counters with without a full
> > cpumask.
> >
> > Signed-off-by: Ian Rogers <irogers@google.com>
> > ---
> > tools/perf/util/stat-display.c | 48 +++++++++++++++++++---------------
> > 1 file changed, 27 insertions(+), 21 deletions(-)
> >
> > diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> > index 588601000f3f..efab39a759ff 100644
> > --- a/tools/perf/util/stat-display.c
> > +++ b/tools/perf/util/stat-display.c
> > @@ -330,8 +330,8 @@ static void print_metric_header(struct perf_stat_config *config,
> > static int first_shadow_cpu(struct perf_stat_config *config,
> > struct evsel *evsel, struct aggr_cpu_id id)
> > {
> > - struct evlist *evlist = evsel->evlist;
> > - int i;
> > + struct perf_cpu_map *cpus;
> > + int cpu, idx;
> >
> > if (config->aggr_mode == AGGR_NONE)
> > return id.core;
> > @@ -339,14 +339,11 @@ static int first_shadow_cpu(struct perf_stat_config *config,
> > if (!config->aggr_get_id)
> > return 0;
> >
> > - for (i = 0; i < evsel__nr_cpus(evsel); i++) {
> > - int cpu2 = evsel__cpus(evsel)->map[i];
> > -
> > - if (cpu_map__compare_aggr_cpu_id(
> > - config->aggr_get_id(config, evlist->core.cpus, cpu2),
> > - id)) {
> > - return cpu2;
> > - }
> > + cpus = evsel__cpus(evsel);
> > + perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
> > + if (cpu_map__compare_aggr_cpu_id(config->aggr_get_id(config, cpus, idx),
> > + id))
> > + return cpu;
>
> so this looks strange, you pass idx instead of cpu2 to aggr_get_id,
> which takes idx as 3rd argument, so it looks like it was broken now,
> should this be a separate fix?
Yep, I tried to cover this in the commit message, but agree a separate
patch would be clearer. The aggregation is currently broken on
anything other than CPU 0 or when the CPU mask covers every CPU - the
case for something like topdown, hence this not being spotted.
> also the original code for some reason passed evlist->core.cpus
> to aggr_get_id, which might differ rom evsel's cpus
Part of the same fix.
> same for aggr_update_shadow change
In this case the cpu is really an index and so the change is just
renaming one to the other for the sake of clarity.
Thanks,
Ian
> jirka
>
next prev parent reply other threads:[~2021-12-13 16:17 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-08 2:45 [PATCH 00/22] Refactor perf cpumap Ian Rogers
2021-12-08 2:45 ` [PATCH 01/22] libperf: Add comments to perf_cpu_map Ian Rogers
2021-12-08 12:05 ` John Garry
2021-12-08 14:34 ` Ian Rogers
2021-12-08 15:09 ` Ian Rogers
2021-12-10 19:08 ` Arnaldo Carvalho de Melo
2021-12-13 8:56 ` John Garry
2021-12-08 2:45 ` [PATCH 02/22] perf stat: Add aggr creators that are passed a cpu Ian Rogers
2021-12-08 12:50 ` John Garry
2021-12-10 19:10 ` Arnaldo Carvalho de Melo
2021-12-08 2:45 ` [PATCH 03/22] perf stat: Switch aggregation to use for_each loop Ian Rogers
2021-12-11 19:24 ` Jiri Olsa
2021-12-13 16:17 ` Ian Rogers [this message]
2021-12-08 2:45 ` [PATCH 04/22] perf stat: Switch to cpu version of cpu_map__get Ian Rogers
2021-12-08 2:45 ` [PATCH 05/22] perf cpumap: Switch cpu_map__build_map to cpu function Ian Rogers
2021-12-08 2:45 ` [PATCH 06/22] perf cpumap: Remove map+index get_socket Ian Rogers
2021-12-11 19:25 ` Jiri Olsa
2021-12-08 2:45 ` [PATCH 07/22] perf cpumap: Remove map+index get_die Ian Rogers
2021-12-08 2:45 ` [PATCH 08/22] perf cpumap: Remove map+index get_core Ian Rogers
2021-12-08 2:45 ` [PATCH 09/22] perf cpumap: Remove map+index get_node Ian Rogers
2021-12-08 2:45 ` [PATCH 10/22] perf cpumap: Add comments to aggr_cpu_id Ian Rogers
2021-12-08 2:45 ` [PATCH 11/22] perf cpumap: Remove unused cpu_map__socket Ian Rogers
2021-12-08 2:45 ` [PATCH 12/22] perf cpumap: Simplify equal function name Ian Rogers
2021-12-08 2:45 ` [PATCH 13/22] perf cpumap: Rename empty functions Ian Rogers
2021-12-08 2:45 ` [PATCH 14/22] perf cpumap: Document cpu__get_node and remove redundant function Ian Rogers
2021-12-08 2:46 ` [PATCH 15/22] perf cpumap: Remove map from function names that don't use a map Ian Rogers
2021-12-08 2:46 ` [PATCH 16/22] perf cpumap: Remove cpu_map__cpu, use libperf function Ian Rogers
2021-12-08 2:46 ` [PATCH 17/22] perf cpumap: Refactor cpu_map__build_map Ian Rogers
2021-12-11 19:25 ` Jiri Olsa
2021-12-08 2:46 ` [PATCH 18/22] perf cpumap: Rename cpu_map__get_X_aggr_by_cpu functions Ian Rogers
2021-12-08 2:46 ` [PATCH 19/22] perf cpumap: Move 'has' function to libperf Ian Rogers
2021-12-08 17:59 ` Mathieu Poirier
2021-12-08 2:46 ` [PATCH 20/22] perf cpumap: Add some comments to cpu_aggr_map Ian Rogers
2021-12-08 2:46 ` [PATCH 21/22] perf cpumap: Trim the cpu_aggr_map Ian Rogers
2021-12-11 19:24 ` Jiri Olsa
2021-12-13 16:11 ` Ian Rogers
2021-12-08 2:46 ` [PATCH 22/22] perf stat: Fix memory leak in check_per_pkg Ian Rogers
2021-12-13 11:39 ` [PATCH 00/22] Refactor perf cpumap James Clark
2021-12-13 16:10 ` Ian Rogers
2021-12-13 22:06 ` Ian Rogers
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