linux-kernel - [PATCH v2 0/3] Improvements for kallsyms_

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Date:   Fri,  1 May 2020 15:13:12 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v2 0/3] Improvements for kallsyms__parse

kallsyms__parse is called 4 times during perf record startup. Add a
benchmark to measure its performance. Transition it to using the api
io.h buffered reading, improving performance by ~8% or saving ~5% from
perf record start up time.

v2. Fix the err return value for success, error reported by
    jolsa@...hat.com. Add clean-up for hex2u64.

Ian Rogers (3):
  perf bench: add kallsyms parsing
  lib kallsyms: parse using io api
  lib kallsyms: move hex2u64 out of header

 tools/lib/api/io.h                |  3 ++
 tools/lib/symbol/kallsyms.c       | 86 ++++++++++++++-----------------
 tools/lib/symbol/kallsyms.h       |  2 -
 tools/perf/bench/Build            |  1 +
 tools/perf/bench/bench.h          |  1 +
 tools/perf/bench/kallsyms-parse.c | 75 +++++++++++++++++++++++++++
 tools/perf/builtin-bench.c        |  1 +
 tools/perf/util/symbol.c          | 14 +++++
 8 files changed, 133 insertions(+), 50 deletions(-)
 create mode 100644 tools/perf/bench/kallsyms-parse.c

-- 
2.26.2.526.g744177e7f7-goog