Apply debug-18385.patch

Author: hackorum

src/backend/postmaster/bgwriter.c

@@ -306,7 +306,7 @@ BackgroundWriterMain(const void *startup_data, size_t startup_data_len)
 		 */
 		rc = WaitLatch(MyLatch,
 					   WL_LATCH_SET | WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
-					   BgWriterDelay /* ms */ , WAIT_EVENT_BGWRITER_MAIN);
+					   1 /* ms */ , WAIT_EVENT_BGWRITER_MAIN);
 
 		/*
 		 * If no latch event and BgBufferSync says nothing's happening, extend

src/backend/storage/buffer/freelist.c

@@ -352,6 +352,7 @@ StrategySyncStart(uint32 *complete_passes, uint32 *num_buf_alloc)
 	{
 		*num_buf_alloc = pg_atomic_exchange_u32(&StrategyControl->numBufferAllocs, 0);
 	}
+pg_usleep(300);
 	SpinLockRelease(&StrategyControl->buffer_strategy_lock);
 	return result;
 }