Re: [PATCH v6 00/27] Constify tool pointers

[Adrian Hunter <adrian.hunter@intel.com>]

On 18/07/24 03:59, Ian Rogers wrote:
> struct perf_tool provides a set of function pointers that are called
> through when processing perf data. To make filling the pointers less
> cumbersome, if they are NULL perf_tools__fill_defaults will add
> default do nothing implementations.
> 
> This change refactors struct perf_tool to have an init function that
> provides the default implementation. The special use of NULL and
> perf_tools__fill_defaults are removed. As a consequence the tool
> pointers can then all be made const, which better reflects the
> behavior a particular perf command would expect of the tool and to
> some extent can reduce the cognitive load on someone working on a
> command.
> 
> v6: Rebase adding Adrian's reviewed-by/tested-by and Leo's tested-by.

The tags were really meant only for patch 1, the email that was replied to.

But now for patches 2 and 3:

Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>

Looking at patches 4 to 25, they do not seem to offer any benefit.

Instead of patch 26, presumably perf_tool__fill_defaults() could
be moved to __perf_session__new(), which perhaps would allow
patch 27 as it is.


> v5: Rebase dropping asan fix merged by Namhyung.
> v4: Simplify perf_session__deliver_synth_attr_event following Adrian's
>     suggestions.
> v3: Just remove auxtrace dummy tools [Adrian] and make s390-cpumsf
>     struct removal its own patch [Adrian].
> v2: Remove dummy tool initialization [Adrian] and make zero sized. Add
>     cs-etm fix for address sanitizer build, found necessary when
>     testing dummy tool change.
> 
> Ian Rogers (27):
>   perf auxtrace: Remove dummy tools
>   perf s390-cpumsf: Remove unused struct
>   perf tool: Constify tool pointers
>   perf tool: Move fill defaults into tool.c
>   perf tool: Add perf_tool__init
>   perf kmem: Use perf_tool__init
>   perf buildid-list: Use perf_tool__init
>   perf kvm: Use perf_tool__init
>   perf lock: Use perf_tool__init
>   perf evlist: Use perf_tool__init
>   perf record: Use perf_tool__init
>   perf c2c: Use perf_tool__init
>   perf script: Use perf_tool__init
>   perf inject: Use perf_tool__init
>   perf report: Use perf_tool__init
>   perf stat: Use perf_tool__init
>   perf annotate: Use perf_tool__init
>   perf sched: Use perf_tool__init
>   perf mem: Use perf_tool__init
>   perf timechart: Use perf_tool__init
>   perf diff: Use perf_tool__init
>   perf data convert json: Use perf_tool__init
>   perf data convert ctf: Use perf_tool__init
>   perf test event_update: Ensure tools is initialized
>   perf kwork: Use perf_tool__init
>   perf tool: Remove perf_tool__fill_defaults
>   perf session: Constify tool
> 
>  tools/perf/arch/x86/util/event.c    |   4 +-
>  tools/perf/bench/synthesize.c       |   2 +-
>  tools/perf/builtin-annotate.c       |  44 ++--
>  tools/perf/builtin-buildid-list.c   |  10 +
>  tools/perf/builtin-c2c.c            |  33 ++-
>  tools/perf/builtin-diff.c           |  30 ++-
>  tools/perf/builtin-evlist.c         |  10 +-
>  tools/perf/builtin-inject.c         | 159 ++++++------
>  tools/perf/builtin-kmem.c           |  20 +-
>  tools/perf/builtin-kvm.c            |  19 +-
>  tools/perf/builtin-kwork.c          |  33 ++-
>  tools/perf/builtin-lock.c           |  41 ++--
>  tools/perf/builtin-mem.c            |  37 +--
>  tools/perf/builtin-record.c         |  47 ++--
>  tools/perf/builtin-report.c         |  67 +++--
>  tools/perf/builtin-sched.c          |  50 ++--
>  tools/perf/builtin-script.c         | 106 ++++----
>  tools/perf/builtin-stat.c           |  26 +-
>  tools/perf/builtin-timechart.c      |  25 +-
>  tools/perf/builtin-top.c            |   2 +-
>  tools/perf/builtin-trace.c          |   4 +-
>  tools/perf/tests/cpumap.c           |   6 +-
>  tools/perf/tests/dlfilter-test.c    |   2 +-
>  tools/perf/tests/dwarf-unwind.c     |   2 +-
>  tools/perf/tests/event_update.c     |   9 +-
>  tools/perf/tests/stat.c             |   6 +-
>  tools/perf/tests/thread-map.c       |   2 +-
>  tools/perf/util/Build               |   1 +
>  tools/perf/util/arm-spe.c           |  55 +----
>  tools/perf/util/auxtrace.c          |  12 +-
>  tools/perf/util/auxtrace.h          |  20 +-
>  tools/perf/util/bpf-event.c         |   4 +-
>  tools/perf/util/build-id.c          |  34 +--
>  tools/perf/util/build-id.h          |   8 +-
>  tools/perf/util/cs-etm.c            |  39 +--
>  tools/perf/util/data-convert-bt.c   |  34 ++-
>  tools/perf/util/data-convert-json.c |  47 ++--
>  tools/perf/util/event.c             |  54 ++--
>  tools/perf/util/event.h             |  38 +--
>  tools/perf/util/header.c            |   6 +-
>  tools/perf/util/header.h            |   4 +-
>  tools/perf/util/hisi-ptt.c          |   6 +-
>  tools/perf/util/intel-bts.c         |  37 +--
>  tools/perf/util/intel-pt.c          |  30 +--
>  tools/perf/util/jitdump.c           |   4 +-
>  tools/perf/util/s390-cpumsf.c       |  11 +-
>  tools/perf/util/session.c           | 366 +++-------------------------
>  tools/perf/util/session.h           |   9 +-
>  tools/perf/util/synthetic-events.c  |  80 +++---
>  tools/perf/util/synthetic-events.h  |  70 +++---
>  tools/perf/util/tool.c              | 294 ++++++++++++++++++++++
>  tools/perf/util/tool.h              |  18 +-
>  tools/perf/util/tsc.c               |   2 +-
>  53 files changed, 977 insertions(+), 1102 deletions(-)
>  create mode 100644 tools/perf/util/tool.c
>