Changeset f76fed4 in mainline for generic/src/proc/thread.c

Timestamp:

2006-03-03T00:20:31Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

09c18f7

Parents:

ddcf365

Message:

Added lazy fpu context allocation.

• threads that don't use fpu, don't get allocated fpu context
• fpu context alignment on AMD64 nicely disappeared

File:

• generic/src/proc/thread.c (modified) (4 diffs)

generic/src/proc/thread.c

@@ -64 +64 @@
 
 static slab_cache_t *thread_slab;
+#ifdef ARCH_HAS_FPU
+slab_cache_t *fpu_context_slab;
+#endif
 
 
@@ -104 +107 @@
         link_initialize(&t->threads_link);
         
+#ifdef ARCH_HAS_FPU
+#  ifdef CONFIG_FPU_LAZY
+        t->saved_fpu_context = NULL;
+#  else
+        t->saved_fpu_context = slab_alloc(fpu_context_slab,kmflags);
+        if (!t->saved_fpu_context)
+                return -1;
+#  endif
+#endif  
+
         pfn = frame_alloc_rc(ONE_FRAME, FRAME_KA | kmflags,&status);
-        if (status)
+        if (status) {
+#ifdef ARCH_HAS_FPU
+                if (t->saved_fpu_context)
+                        slab_free(fpu_context_slab,t->saved_fpu_context);
+#endif
                 return -1;
+        }
         t->kstack = (__u8 *)PA2KA(PFN2ADDR(pfn));
 
@@ -118 +136 @@
 
         frame_free(ADDR2PFN(KA2PA(t->kstack)));
+#ifdef ARCH_HAS_FPU
+        if (t->saved_fpu_context)
+                slab_free(fpu_context_slab,t->saved_fpu_context);
+#endif
         return 1; /* One page freed */
 }
@@ -133 +155 @@
                                         sizeof(thread_t),0, 
                                         thr_constructor, thr_destructor, 0);
+#ifdef ARCH_HAS_FPU
+        fpu_context_slab = slab_cache_create("fpu_slab",
+                                             sizeof(fpu_context_t),
+                                             FPU_CONTEXT_ALIGN,
+                                             NULL, NULL, 0);
+#endif
 }