meson: wire up benchmarking options

Wire up a couple of benchmarking options that we end up writing into our
"GIT-BUILD-OPTIONS" file. These options allow users to control how
exactly benchmarks are executed.

Note that neither `GIT_PERF_MAKE_COMMAND` nor `GIT_PERF_MAKE_OPTS` are
exposed as a build option. Those options are used by "t/perf/run", which
is not used by Meson.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

meson.build

@@ -706,11 +706,11 @@ builtin_sources += custom_target(
 # build options to our tests.
 build_options_config = configuration_data()
 build_options_config.set('GIT_INTEROP_MAKE_OPTS', '')
-build_options_config.set('GIT_PERF_LARGE_REPO', '')
+build_options_config.set_quoted('GIT_PERF_LARGE_REPO', get_option('benchmark_large_repo'))
 build_options_config.set('GIT_PERF_MAKE_COMMAND', '')
 build_options_config.set('GIT_PERF_MAKE_OPTS', '')
-build_options_config.set('GIT_PERF_REPEAT_COUNT', '')
-build_options_config.set('GIT_PERF_REPO', '')
+build_options_config.set_quoted('GIT_PERF_REPEAT_COUNT', get_option('benchmark_repeat_count').to_string())
+build_options_config.set_quoted('GIT_PERF_REPO', get_option('benchmark_repo'))
 build_options_config.set('GIT_TEST_CMP_USE_COPIED_CONTEXT', '')
 build_options_config.set('GIT_TEST_INDEX_VERSION', '')
 build_options_config.set('GIT_TEST_OPTS', '')

meson_options.txt

@@ -103,6 +103,12 @@ option('docs_backend', type: 'combo', choices: ['asciidoc', 'asciidoctor', 'auto
 # Testing.
 option('benchmarks', type: 'feature', value: 'auto',
   description: 'Enable benchmarks. This requires Perl and GNU time.')
+option('benchmark_repo', type: 'string', value: '',
+  description: 'Repository to copy for the performance tests. Should be at least the size of the Git repository.')
+option('benchmark_large_repo', type: 'string', value: '',
+  description: 'Large repository to copy for the performance tests. Should be at least the size of the Linux repository.')
+option('benchmark_repeat_count', type: 'integer', value: 3,
+  description: 'Number of times a test should be repeated for best-of-N measurements.')
 option('coccinelle', type: 'feature', value: 'auto',
   description: 'Provide a coccicheck target that generates a Coccinelle patch.')
 option('tests', type: 'boolean', value: true,