[PATCH v6 2/4] t/perf: add last-modified perf script

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This just runs some simple last-modified commands. We already test
correctness in the regular suite, so this is just about finding
performance regressions from one version to another.

Based-on-patch-by: Jeff King <peff@xxxxxxxx>
Signed-off-by: Toon Claes <toon@xxxxxxxxx>
---
 t/meson.build                 |  1 +
 t/perf/p8020-last-modified.sh | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100755 t/perf/p8020-last-modified.sh

diff --git a/t/meson.build b/t/meson.build
index 904455e3ab..b74125b047 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -1155,6 +1155,7 @@ benchmarks = [
   'perf/p7820-grep-engines.sh',
   'perf/p7821-grep-engines-fixed.sh',
   'perf/p7822-grep-perl-character.sh',
+  'perf/p8020-last-modified.sh',
   'perf/p9210-scalar.sh',
   'perf/p9300-fast-import-export.sh',
 ]
diff --git a/t/perf/p8020-last-modified.sh b/t/perf/p8020-last-modified.sh
new file mode 100755
index 0000000000..cb1f98d3db
--- /dev/null
+++ b/t/perf/p8020-last-modified.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+test_description='last-modified perf tests'
+. ./perf-lib.sh
+
+test_perf_default_repo
+
+test_perf 'top-level last-modified' '
+	git last-modified HEAD
+'
+
+test_perf 'top-level recursive last-modified' '
+	git last-modified -r HEAD
+'
+
+test_perf 'subdir last-modified' '
+	git ls-tree -d HEAD >subtrees &&
+	path="$(head -n 1 subtrees | cut -f2)" &&
+	git last-modified -r HEAD -- "$path"
+'
+
+test_done
-- 
2.50.1.327.g047016eb4a





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