update PITR

pageserver/src/layered_repository.rs

@@ -2190,7 +2190,7 @@ impl LayeredTimeline {
 
         // Calculate pitr cutoff point.
         // If we cannot determine a cutoff LSN, be conservative and don't GC anything.
-        let mut pitr_cutoff_lsn = cutoff;
+        let mut pitr_cutoff_lsn = *self.get_latest_gc_cutoff_lsn();
 
         if let Ok(timeline) =
             tenant_mgr::get_local_timeline_with_load(self.tenant_id, self.timeline_id)

test_runner/batch_others/test_branch_and_gc.py

@@ -59,6 +59,9 @@ def test_branch_and_gc(neon_simple_env: NeonEnv):
             'compaction_period': '1 s',
             'compaction_threshold': '2',
             'image_creation_threshold': '1',
+
+            # set PITR interval to be small, so we can do GC
+            'pitr_interval': '1 s'
         })
 
     timeline_main = env.neon_cli.create_timeline(f'test_main', tenant_id=tenant)