add RAM usage counting

+ Slightly more overhead but will help track down possible memory leaks
  in the future. Could also add in a flag for turning off/on but I don't
  think the difference in performance is that significant.

2 files changed, 32 insertions, 0 deletions

diff --git a/include/kmi/pmem.h b/include/kmi/pmem.h
index 966f269..0c7a4a2 100644
--- a/include/kmi/pmem.h
+++ b/include/kmi/pmem.h
@@ -39,6 +39,9 @@ void mark_used(enum mm_order order, pm_t addr);
  */
 pm_t alloc_page(enum mm_order order);
 
+/** @return How many bytes of memory are currently in use. */
+size_t query_used();
+
 /**
  * Populate physical RAM usage map.
  * In theory we could easily implement NUMA nodes by just using different orders
diff --git a/include/kmi/syscalls.h b/include/kmi/syscalls.h
index 0801f50..a94cdf1 100644
--- a/include/kmi/syscalls.h
+++ b/include/kmi/syscalls.h
@@ -204,6 +204,35 @@ enum notify_flag {
  */
 typedef long sys_arg_t;
 
+/** IDs for configuration parameters. */
+enum conf_param {
+	/**
+	 * How large a regular thread stack is.
+	 * \c R/W
+	 */
+	CONF_THREAD_STACK,
+
+	/**
+	 * How large an RPC stack element is. R/W. Note that this is not how
+	 * large the RPC stack is in total, as that is hardcoded by the
+	 * architecture, but how much of that stack one RPC call can take.
+	 * \c R/W
+	 */
+	CONF_RPC_STACK,
+
+	/**
+	 * Current RAM usage.
+	 * \c R
+	 */
+	CONF_RAM_USAGE,
+
+	/**
+	 * Total RAM size.
+	 * \c R.
+	 */
+	CONF_RAM_SIZE,
+};
+
 /**
  * Return structure of syscall.
  * \note Field names are generic, and can be used for whatever,