daemon/worker: decommit memory every 1000nth pool delete

daemon/worker.c

@@ -14,6 +14,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <malloc.h>
 #include <uv.h>
 #include <libknot/packet/pkt.h>
 #include <libknot/internal/net.h>
@@ -137,6 +138,14 @@ static void qr_task_free(uv_handle_t *handle)
 		array_push(worker->pools, mp_context);
 	} else {
 		mp_delete(mp_context);
+#ifdef _GNU_SOURCE
+		/* Decommit memory every once in a while */
+		static int mp_delete_count = 0;
+		if (++mp_delete_count == 1000) {
+			malloc_trim(0);
+			mp_delete_count = 0;
+		}
+#endif
 	}
 }