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authorDaniel Vetter <daniel.vetter@ffwll.ch>2011-02-18 17:59:12 +0100
committerDave Airlie <airlied@redhat.com>2011-02-23 10:32:34 +1000
commitea7b1dd44867e9cd6bac67e7c9fc3f128b5b255c (patch)
tree2feb9852ab18e2f726136ae460e414ef40425129 /include/drm/drm_mm.h
parent31a5b8ce8f3bf20799eb68da9602de2bee58fdd3 (diff)
drm: mm: track free areas implicitly
The idea is to track free holes implicitly by marking the allocation immediatly preceeding a hole. To avoid an ugly corner case add a dummy head_node to struct drm_mm to track the hole that spans to complete allocation area when the memory manager is empty. To guarantee that there's always a preceeding/following node (that might be marked as hole_follows == 1), move the mm->node_list list_head to the head_node. The main allocator and fair-lru scan code actually becomes simpler. Only the debug code slightly suffers because free areas are no longer explicit. Also add drm_mm_for_each_node (which will be much more useful when struct drm_mm_node is embeddable). Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm/drm_mm.h')
-rw-r--r--include/drm/drm_mm.h21
1 files changed, 12 insertions, 9 deletions
diff --git a/include/drm/drm_mm.h b/include/drm/drm_mm.h
index 0d791462f7b2..34fa36f2de70 100644
--- a/include/drm/drm_mm.h
+++ b/include/drm/drm_mm.h
@@ -42,23 +42,24 @@
#endif
struct drm_mm_node {
- struct list_head free_stack;
struct list_head node_list;
- unsigned free : 1;
+ struct list_head hole_stack;
+ unsigned hole_follows : 1;
unsigned scanned_block : 1;
unsigned scanned_prev_free : 1;
unsigned scanned_next_free : 1;
+ unsigned scanned_preceeds_hole : 1;
unsigned long start;
unsigned long size;
struct drm_mm *mm;
};
struct drm_mm {
- /* List of free memory blocks, most recently freed ordered. */
- struct list_head free_stack;
- /* List of all memory nodes, ordered according to the (increasing) start
- * address of the memory node. */
- struct list_head node_list;
+ /* List of all memory nodes that immediatly preceed a free hole. */
+ struct list_head hole_stack;
+ /* head_node.node_list is the list of all memory nodes, ordered
+ * according to the (increasing) start address of the memory node. */
+ struct drm_mm_node head_node;
struct list_head unused_nodes;
int num_unused;
spinlock_t unused_lock;
@@ -74,9 +75,11 @@ struct drm_mm {
static inline bool drm_mm_initialized(struct drm_mm *mm)
{
- return mm->free_stack.next;
+ return mm->hole_stack.next;
}
-
+#define drm_mm_for_each_node(entry, mm) list_for_each_entry(entry, \
+ &(mm)->head_node.node_list, \
+ node_list);
/*
* Basic range manager support (drm_mm.c)
*/