linux-kernel - Re: [RFC PATCH 0/7] Share events between metrics

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Date:   Thu, 7 May 2020 07:11:13 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [RFC PATCH 0/7] Share events between metrics

On Thu, May 7, 2020 at 6:49 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Thu, May 07, 2020 at 01:14:29AM -0700, Ian Rogers wrote:
> > Metric groups contain metrics. Metrics create groups of events to
> > ideally be scheduled together. Often metrics refer to the same events,
> > for example, a cache hit and cache miss rate. Using separate event
> > groups means these metrics are multiplexed at different times and the
> > counts don't sum to 100%. More multiplexing also decreases the
> > accuracy of the measurement.
> >
> > This change orders metrics from groups or the command line, so that
> > the ones with the most events are set up first. Later metrics see if
> > groups already provide their events, and reuse them if
> > possible. Unnecessary events and groups are eliminated.
> >
> > RFC because:
> >  - without this change events within a metric may get scheduled
> >    together, after they may appear as part of a larger group and be
> >    multiplexed at different times, lowering accuracy - however, less
> >    multiplexing may compensate for this.
> >  - libbpf's hashmap is used, however, libbpf is an optional
> >    requirement for building perf.
> >  - other things I'm not thinking of.
>
> hi,
> I can't apply this, what branch/commit is this based on?
>
>         Applying: perf expr: migrate expr ids table to libbpf's hashmap
>         error: patch failed: tools/perf/tests/pmu-events.c:428
>         error: tools/perf/tests/pmu-events.c: patch does not apply
>         error: patch failed: tools/perf/util/expr.h:2
>         error: tools/perf/util/expr.h: patch does not apply
>         error: patch failed: tools/perf/util/expr.y:73
>         error: tools/perf/util/expr.y: patch does not apply
>         Patch failed at 0001 perf expr: migrate expr ids table to libbpf's hashmap
>
> thanks,
> jirka

Thanks for trying! I have resent the entire patch series here:
https://lore.kernel.org/lkml/20200507140819.126960-1-irogers@google.com/
It is acme's perf/core tree + metric fix/test CLs + some minor fixes.
Details in the cover letter.

Thanks,
Ian

> >
> > Thanks!
> >
> > Ian Rogers (7):
> >   perf expr: migrate expr ids table to libbpf's hashmap
> >   perf metricgroup: change evlist_used to a bitmap
> >   perf metricgroup: free metric_events on error
> >   perf metricgroup: always place duration_time last
> >   perf metricgroup: delay events string creation
> >   perf metricgroup: order event groups by size
> >   perf metricgroup: remove duped metric group events
> >
> >  tools/perf/tests/expr.c       |  32 ++---
> >  tools/perf/tests/pmu-events.c |  22 ++--
> >  tools/perf/util/expr.c        | 125 ++++++++++--------
> >  tools/perf/util/expr.h        |  22 ++--
> >  tools/perf/util/expr.y        |  22 +---
> >  tools/perf/util/metricgroup.c | 242 +++++++++++++++++++++-------------
> >  tools/perf/util/stat-shadow.c |  46 ++++---
> >  7 files changed, 280 insertions(+), 231 deletions(-)
> >
> > --
> > 2.26.2.526.g744177e7f7-goog
> >
>