Add support for tracking and logging daemon memory usage.

Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/lib/memory.h b/lib/memory.h
new file mode 100644
index 00000000..4edd9561
--- /dev/null
+++ b/lib/memory.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2012 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MEMORY_H
+#define MEMORY_H 1
+
+/* Memory usage monitor.
+ *
+ * This is intended to be called as part of a daemon's main loop.  After some
+ * time to allow the daemon to allocate an initial memory usage, it logs some
+ * memory usage information (most of which must actually be provided by the
+ * client).  At intervals, if the daemon's memory usage has grown
+ * significantly, it again logs information.
+ *
+ * The monitor also has a unixctl interface.
+ *
+ * Intended usage in the program's main loop is like this:
+ *
+ * for (;;) {
+ *     memory_run();
+ *     if (memory_should_report()) {
+ *          struct simap usage;
+ *
+ *          simap_init(&usage);
+ *          ...fill in 'usage' with meaningful statistics...
+ *          memory_report(&usage);
+ *          simap_destroy(&usage);
+ *     }
+ *
+ *     ...
+ *
+ *     memory_wait();
+ *     poll_block();
+ * }
+ */
+
+#include <stdbool.h>
+
+struct simap;
+
+void memory_run(void);
+void memory_wait(void);
+
+bool memory_should_report(void);
+void memory_report(const struct simap *usage);
+
+#endif /* memory.h */