p7519: add fsmonitor--daemon

Repeat all of the fsmonitor perf tests using `git fsmonitor--daemon` and
the "Simple IPC" interface.

Signed-off-by: Jeff Hostetler <[email protected]>

Author: jeffhostetler

t/perf/p7519-fsmonitor.sh

@@ -24,7 +24,8 @@ test_description="Test core.fsmonitor"
 # GIT_PERF_7519_SPLIT_INDEX: used to configure core.splitIndex
 # GIT_PERF_7519_FSMONITOR: used to configure core.fsMonitor. May be an
 #   absolute path to an integration. May be a space delimited list of
-#   absolute paths to integrations.
+#   absolute paths to integrations.  (This hook or list of hooks does not
+#   include the built-in fsmonitor--daemon.)
 #
 # The big win for using fsmonitor is the elimination of the need to scan the
 # working directory looking for changed and untracked files. If the file
@@ -135,10 +136,16 @@ test_expect_success "one time repo setup" '
 
 setup_for_fsmonitor() {
 	# set INTEGRATION_SCRIPT depending on the environment
-	if test -n "$INTEGRATION_PATH"
+	if test -n "$USE_FSMONITOR_DAEMON"
 	then
+		git config core.useBuiltinFSMonitor true &&
+		INTEGRATION_SCRIPT=false
+	elif test -n "$INTEGRATION_PATH"
+	then
+		git config core.useBuiltinFSMonitor false &&
 		INTEGRATION_SCRIPT="$INTEGRATION_PATH"
 	else
+		git config core.useBuiltinFSMonitor false &&
 		#
 		# Choose integration script based on existence of Watchman.
 		# Fall back to an empty integration script.
@@ -285,4 +292,30 @@ test_expect_success "setup without fsmonitor" '
 test_fsmonitor_suite
 trace_stop
 
+#
+# Run a full set of perf tests using the built-in fsmonitor--daemon.
+# It does not use the Hook API, so it has a different setup.
+# Explicitly start the daemon here and before we start client commands
+# so that we can later add custom tracing.
+#
+
+test_lazy_prereq HAVE_FSMONITOR_DAEMON '
+	git version --build-options | grep "feature:" | grep "fsmonitor--daemon"
+'
+
+if test_have_prereq HAVE_FSMONITOR_DAEMON
+then
+	USE_FSMONITOR_DAEMON=t
+
+	trace_start fsmonitor--daemon--server
+	git fsmonitor--daemon --start
+
+	trace_start fsmonitor--daemon--client
+	test_expect_success "setup for fsmonitor--daemon" 'setup_for_fsmonitor'
+	test_fsmonitor_suite
+
+	git fsmonitor--daemon --stop
+	trace_stop
+fi
+
 test_done