Changeset a55ddc64 in mainline for kernel/genarch/src/mm/page_ht.c

Timestamp:

2011-11-17T22:29:00Z (14 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

ad12b5ea

Parents:

6b326ea1

Message:

Allocate PTEs from low memory.

• Introduce a dedicated slab cache for pte_t's.
• This should limit the depth of nested page faults.

File:

• kernel/genarch/src/mm/page_ht.c (modified) (3 diffs)

kernel/genarch/src/mm/page_ht.c

@@ -60 +60 @@
 static pte_t *ht_mapping_find(as_t *, uintptr_t, bool);
 
+slab_cache_t *pte_cache = NULL;
+
 /**
  * This lock protects the page hash table. It must be acquired
@@ -163 +165 @@
         pte_t *pte = hash_table_get_instance(item, pte_t, link);
         
-        free(pte);
+        slab_free(pte_cache, pte);
 }
 
@@ -188 +190 @@
         
         if (!hash_table_find(&page_ht, key)) {
-                pte_t *pte = (pte_t *) malloc(sizeof(pte_t), FRAME_ATOMIC);
+                pte_t *pte = slab_alloc(pte_cache, FRAME_LOWMEM | FRAME_ATOMIC);
                 ASSERT(pte != NULL);