refactor(test): merge two snapshot perf test files

Move the snapshot creation latency test into test_snapshot_ab.py. It
won't be automatically A/B-tested (because pipeline_perf.py refers to
specific test names inside this file), but technically it could be. No
functional change intended.

Doing this because I was getting annoyed at not being able to
tab-complete `test_s` into `test_snapshot_ab`.

Signed-off-by: Patrick Roy <[email protected]>

Author: roypat

tests/integration_tests/performance/test_snapshot_ab.py

@@ -249,3 +249,29 @@ def test_population_latency(
                 break
         else:
             raise RuntimeError("UFFD handler did not print population latency after 5s")
+
+
+def test_snapshot_create_latency(
+    microvm_factory,
+    guest_kernel_linux_5_10,
+    rootfs,
+    metrics,
+):
+    """Measure the latency of creating a Full snapshot"""
+
+    vm = microvm_factory.build(guest_kernel_linux_5_10, rootfs, monitor_memory=False)
+    vm.spawn()
+    vm.basic_config(vcpu_count=2, mem_size_mib=512)
+    vm.start()
+    vm.pin_threads(0)
+
+    metrics.set_dimensions(
+        {**vm.dimensions, "performance_test": "test_snapshot_create_latency"}
+    )
+
+    for _ in range(ITERATIONS):
+        vm.snapshot_full()
+        fc_metrics = vm.flush_metrics()
+
+        value = fc_metrics["latencies_us"]["full_create_snapshot"] / USEC_IN_MSEC
+        metrics.put_metric("latency", value, "Milliseconds")