Changeset 6265a2b in mainline for kernel/generic/src/sysinfo/stats.c

Timestamp:

2011-01-26T14:52:55Z (14 years ago)

Author:

Vojtech Horky <vojtechhorky@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

7fc092a, 9f0318c, ea6a824

Parents:

192a0063 (diff), a0ce870 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge mainline changes

File:

• kernel/generic/src/sysinfo/stats.c (modified) (3 diffs)

kernel/generic/src/sysinfo/stats.c

@@ -170 +170 @@
          * Note that it may be infinitely better to let the address space
          * management code compute these statistics as it proceeds instead of
-         * having them calculated here over and over again here.
+         * having them calculated over and over again here.
          */
 
@@ -199 +199 @@
 }
 
+/** Get the resident (used) size of a virtual address space
+ *
+ * @param as Address space.
+ *
+ * @return Size of the resident (used) virtual address space (bytes).
+ *
+ */
+static size_t get_task_resmem(as_t *as)
+{
+        size_t result = 0;
+        
+        /*
+         * We are holding some spinlocks here and therefore are not allowed to
+         * block. Only attempt to lock the address space and address space area
+         * mutexes conditionally. If it is not possible to lock either object,
+         * allow the statistics to be inexact by skipping the respective object.
+         *
+         * Note that it may be infinitely better to let the address space
+         * management code compute these statistics as it proceeds instead of
+         * having them calculated over and over again here.
+         */
+        
+        if (SYNCH_FAILED(mutex_trylock(&as->lock)))
+                return result * PAGE_SIZE;
+        
+        /* Walk the B+ tree of AS areas */
+        link_t *cur;
+        for (cur = as->as_area_btree.leaf_head.next;
+            cur != &as->as_area_btree.leaf_head; cur = cur->next) {
+                btree_node_t *node =
+                    list_get_instance(cur, btree_node_t, leaf_link);
+                
+                unsigned int i;
+                for (i = 0; i < node->keys; i++) {
+                        as_area_t *area = node->value[i];
+                        
+                        if (SYNCH_FAILED(mutex_trylock(&area->lock)))
+                                continue;
+                        
+                        /* Walk the B+ tree of resident pages */
+                        link_t *rcur;
+                        for (rcur = area->used_space.leaf_head.next;
+                            rcur != &area->used_space.leaf_head; rcur = rcur->next) {
+                                btree_node_t *rnode =
+                                    list_get_instance(rcur, btree_node_t, leaf_link);
+                                
+                                unsigned int j;
+                                for (j = 0; j < rnode->keys; j++)
+                                        result += (size_t) rnode->value[i];
+                        }
+                        
+                        mutex_unlock(&area->lock);
+                }
+        }
+        
+        mutex_unlock(&as->lock);
+        
+        return result * PAGE_SIZE;
+}
+
 /* Produce task statistics
  *
@@ -215 +275 @@
         str_cpy(stats_task->name, TASK_NAME_BUFLEN, task->name);
         stats_task->virtmem = get_task_virtmem(task->as);
+        stats_task->resmem = get_task_resmem(task->as);
         stats_task->threads = atomic_get(&task->refcount);
         task_get_accounting(task, &(stats_task->ucycles),