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Date:   Fri, 15 May 2020 15:17:25 -0700
From:   Ian Rogers <>
To:     Peter Zijlstra <>,
        Ingo Molnar <>,
        Arnaldo Carvalho de Melo <>,
        Mark Rutland <>,
        Alexander Shishkin <>,
        Jiri Olsa <>,
        Namhyung Kim <>,
        Alexei Starovoitov <>,
        Daniel Borkmann <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        Andrii Nakryiko <>,
        John Fastabend <>,
        KP Singh <>,
        Kajol Jain <>,
        Andi Kleen <>,
        John Garry <>,
        Jin Yao <>,
        Kan Liang <>,
        Cong Wang <>,
        Kim Phillips <>,
        Adrian Hunter <>,
        Leo Yan <>,,,
Cc:     Stephane Eranian <>,
        Ian Rogers <>
Subject: [PATCH v3 0/7] Copy hashmap to tools/perf/util, use in perf expr

Perf's expr code currently builds an array of strings then removes
duplicates. The array is larger than necessary and has recently been
increased in size. When this was done it was commented that a hashmap
would be preferable.

libbpf has a hashmap but libbpf isn't currently required to build
perf. To satisfy various concerns this change copies libbpf's hashmap
into tools/perf/util, it then adds a check in perf that the two are in

Andrii's patch to hashmap from bpf-next is brought into this set to
fix issues with hashmap__clear.

Two minor changes to libbpf's hashmap are made that remove an unused
dependency and fix a compiler warning.

Two perf test changes are also brought in as they need refactoring to
account for the expr API change and it is expected they will land
ahead of this.

Tested with 'perf test' and 'make -C tools/perf build-test'.

The hashmap change was originally part of an RFC:

v3. addresses review feedback from Andrii Nakryiko <>
and Jiri Olsa <>.
v2. moves hashmap into tools/perf/util rather than libapi, to allow
hashmap's libbpf symbols to be visible when built statically for

Andrii Nakryiko (1):
  libbpf: Fix memory leak and possible double-free in hashmap__clear

Ian Rogers (6):
  libbpf hashmap: Remove unused #include
  libbpf hashmap: Fix signedness warnings
  tools lib/api: Copy libbpf hashmap to tools/perf/util
  perf test: Provide a subtest callback to ask for the reason for
    skipping a subtest
  perf test: Improve pmu event metric testing
  perf expr: Migrate expr ids table to a hashmap

 tools/lib/bpf/hashmap.c         |  10 +-
 tools/lib/bpf/hashmap.h         |   1 -
 tools/perf/     |   4 +
 tools/perf/tests/builtin-test.c |  18 ++-
 tools/perf/tests/expr.c         |  44 +++---
 tools/perf/tests/pmu-events.c   | 169 ++++++++++++++++++++++-
 tools/perf/tests/tests.h        |   4 +
 tools/perf/util/Build           |   4 +
 tools/perf/util/expr.c          | 129 +++++++++--------
 tools/perf/util/expr.h          |  26 ++--
 tools/perf/util/expr.y          |  22 +--
 tools/perf/util/hashmap.c       | 238 ++++++++++++++++++++++++++++++++
 tools/perf/util/hashmap.h       | 177 ++++++++++++++++++++++++
 tools/perf/util/metricgroup.c   |  92 ++++++------
 tools/perf/util/stat-shadow.c   |  49 ++++---
 15 files changed, 798 insertions(+), 189 deletions(-)
 create mode 100644 tools/perf/util/hashmap.c
 create mode 100644 tools/perf/util/hashmap.h


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