[PATCH 0/4] Introduce perf check subcommand

[Aditya Gupta]

The Problem
===========

Currently the presence of a feature is checked with a combination of
perf version --build-options and greps, such as:

    perf version --build-options | grep " on .* HAVE_FEATURE"

Proposed solution
=================

As suggested by contributors in:
https://lore.kernel.org/linux-perf-users/ZMPWk5K63tadmDlU@xxxxxxxxxx/

Introduce a subcommand "perf check --feature", with which
scripts can test for presence of a feature, such as:

    perf check --feature HAVE_LIBTRACEEVENT

    or

    perf check --feature libtraceevent

The usage of "perf version --build-options | grep" has been replaced in two
tests, with "perf check --feature" command

Also, to not duplicate the same feature list at multiple places, a new global
'supported_features' array has been introduced in builtin.h, so both commands
'perf check --feature' and 'perf version --build-options' use the same array

'supported_features' feature is an array of 'struct feature_support', which
also has the name of the feature, macro used to test it's presence, and a
is_builtin member, which will be 0 if feature not built-in, and 1 if built-in

Architectures Tested
====================
* x86_64
* ppc64le

Git tree
========

Git tree with this patch series applied for testing:
https://github.com/adi-g15-ibm/linux/tree/perf-check-feature

Changelog
=========
V1
+ changed subcommand name to 'perf check --feature'
+ added documentation for perf check
+ support both macro (eg. HAVE_LIBTRACEEVENT), and name (eg. libtraceevent) as
  input to 'perf check --feature'
+ change subject and descriptions of all patch mentioning perf check instead of
  perf build

V0: Previous patch series: https://lore.kernel.org/linux-perf-users/20230825061125.24312-1-adityag@xxxxxxxxxxxxx/

Aditya Gupta (3):
  perf check: introduce check subcommand
  perf version: update --build-options to use 'supported_features' array
  perf tests task_analyzer: use perf check for libtraceevent support

Athira Rajeev (1):
  tools/perf/tests: Update probe_vfs_getname.sh script to use perf check
    --feature

 tools/perf/Build                              |  1 +
 tools/perf/Documentation/perf-check.txt       | 53 +++++++++++
 tools/perf/builtin-check.c                    | 95 +++++++++++++++++++
 tools/perf/builtin-version.c                  | 39 ++------
 tools/perf/builtin.h                          | 47 +++++++++
 tools/perf/perf.c                             |  1 +
 .../perf/tests/shell/lib/probe_vfs_getname.sh |  4 +-
 .../shell/record+probe_libc_inet_pton.sh      |  5 +-
 .../shell/record+script_probe_vfs_getname.sh  |  5 +-
 tools/perf/tests/shell/test_task_analyzer.sh  |  4 +-
 10 files changed, 217 insertions(+), 37 deletions(-)
 create mode 100644 tools/perf/Documentation/perf-check.txt
 create mode 100644 tools/perf/builtin-check.c

-- 
2.41.0