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From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
	Jin Yao <yao.jin@linux.intel.com>,
	John Garry <john.garry@huawei.com>, Paul Clarke <pc@us.ibm.com>,
	kajoljain <kjain@linux.ibm.com>
Cc: Stephane Eranian <eranian@google.com>,
	Sandeep Dasgupta <sdasgup@google.com>,
	linux-perf-users@vger.kernel.org, Ian Rogers <irogers@google.com>
Subject: [PATCH v2 0/5] Don't compute events that won't be used in a metric.
Date: Tue, 17 Nov 2020 21:03:30 -0800
Message-ID: <20201118050335.2347358-1-irogers@google.com> (raw)

    
For a metric like:
  EVENT1 if #smt_on else EVENT2
    
currently EVENT1 and EVENT2 will be measured and then when the metric
is reported EVENT1 or EVENT2 will be printed depending on the value
from smt_on() during the expr parsing. Computing both events is
unnecessary and can lead to multiplexing as discussed in this thread:
https://lore.kernel.org/lkml/20201110100346.2527031-1-irogers@google.com/

This change modifies expression parsing so that constants are
considered when building the set of ids (events) and only events not
contributing to a constant value are measured.

v2. is a rebase.

Ian Rogers (5):
  perf metric: Restructure struct expr_parse_ctx.
  perf metric: Use NAN for missing event IDs.
  perf metric: Rename expr__find_other.
  perf metric: Add utilities to work on ids map.
  perf metric: Don't compute unused events.

 tools/perf/tests/expr.c       | 148 ++++++++++-----
 tools/perf/tests/pmu-events.c |  42 +++--
 tools/perf/util/expr.c        | 136 ++++++++++++--
 tools/perf/util/expr.h        |  17 +-
 tools/perf/util/expr.l        |   9 -
 tools/perf/util/expr.y        | 343 +++++++++++++++++++++++++++-------
 tools/perf/util/metricgroup.c |  44 +++--
 tools/perf/util/stat-shadow.c |  54 ++++--
 8 files changed, 586 insertions(+), 207 deletions(-)

-- 
2.29.2.299.gdc1121823c-goog


             reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18  5:03 Ian Rogers [this message]
2020-11-18  5:03 ` [PATCH v2 1/5] perf metric: Restructure struct expr_parse_ctx Ian Rogers
2020-11-18  5:03 ` [PATCH v2 2/5] perf metric: Use NAN for missing event IDs Ian Rogers
2020-11-19 19:47   ` Jiri Olsa
2020-11-18  5:03 ` [PATCH v2 3/5] perf metric: Rename expr__find_other Ian Rogers
2020-11-18  5:03 ` [PATCH v2 4/5] perf metric: Add utilities to work on ids map Ian Rogers
2020-11-18  5:03 ` [PATCH v2 5/5] perf metric: Don't compute unused events Ian Rogers
2020-11-19 20:59   ` Jiri Olsa
     [not found]     ` <CAP-5=fWjzwDg7SbfBq+mHqT+zDEEpei8M5AF8+Bk8sU19Ta_hg@mail.gmail.com>
2020-11-20 19:35       ` Jiri Olsa

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