Changeset 625 for trunk/kernel/mm/page.h

Timestamp:

Apr 10, 2019, 10:09:39 AM (5 years ago)

Author:

alain

Message:

Fix a bug in the vmm_remove_vseg() function: the physical pages
associated to an user DATA vseg were released to the kernel when
the target process descriptor was in the reference cluster.
This physical pages release should be done only when the page
forks counter value is zero.
All other modifications are cosmetic.

File:

• trunk/kernel/mm/page.h (modified) (2 diffs)

trunk/kernel/mm/page.h

@@ -50 +50 @@
  *   test/modify the forks counter or the page flags.
  * - The list entry is used to register the page in a free list or in dirty list.
- * NOTE: Size is 48 bytes for a 32 bits core.
- * TODO : the refcount use is not defined [AG]
+ *   The refcount is used for page release to KMEM.
+ * NOTE: the size is 48 bytes for a 32 bits core.
  ************************************************************************************/
 
@@ -61 +61 @@
     uint32_t          index;          /*! page index in mapper                 (4)  */
         list_entry_t      list;           /*! for both dirty pages and free pages  (8)  */
-        uint32_t          refcount;       /*! reference counter TODO ??? [AG]      (4)  */
+        int32_t           refcount;       /*! references counter for page release  (4)  */
         uint32_t          forks;          /*! number of pending forks              (4)  */
         remote_busylock_t lock;           /*! protect forks or flags modifs        (16) */