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 [thread overview]
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
next reply other threads:[~2020-11-18 5:04 UTC|newest]
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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