Changeset b49f4ae in mainline for src/proc/scheduler.c

Timestamp:

2005-09-06T09:56:26Z (19 years ago)

Author:

Ondrej Palkovsky <ondrap@…>

Branches:

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

Children:

50a4e25

Parents:

a5d1331

Message:

Added architecture independent hooks for fpu lazy context switching.
It is enabled by defining FPU_LAZY

File:

• src/proc/scheduler.c (modified) (2 diffs)

src/proc/scheduler.c

@@ -61 +61 @@
 void before_thread_runs(void)
 {
-        before_thread_runs_arch(); 
-        fpu_context_restore(&(THREAD->saved_fpu_context));
-}
-
+        before_thread_runs_arch();
+#ifdef FPU_LAZY
+        if(THREAD==CPU->fpu_owner) 
+                fpu_enable();
+        else
+                fpu_disable(); 
+#else
+        fpu_enable();
+        if (THREAD->fpu_context_exists)
+                fpu_context_restore(&(THREAD->saved_fpu_context));
+        else {
+                fpu_init();
+                THREAD->fpu_context_exists=1;
+        }
+#endif
+}
+
+#ifdef FPU_LAZY
+void scheduler_fpu_lazy_request(void)
+{
+        fpu_enable();
+        if (CPU->fpu_owner != NULL) {  
+                fpu_context_save(&CPU->fpu_owner->saved_fpu_context);
+                /* don't prevent migration */
+                CPU->fpu_owner->fpu_context_engaged=0; 
+        }
+        if (THREAD->fpu_context_exists)
+                fpu_context_restore(&THREAD->saved_fpu_context);
+        else {
+                fpu_init();
+                THREAD->fpu_context_exists=1;
+        }
+        CPU->fpu_owner=THREAD;
+        THREAD->fpu_context_engaged = 1;
+}
+#endif
 
 /** Initialize scheduler
@@ -241 +273 @@
         if (THREAD) {
                 spinlock_lock(&THREAD->lock);
+#ifndef FPU_LAZY
                 fpu_context_save(&(THREAD->saved_fpu_context));
+#endif
                 if (!context_save(&THREAD->saved_context)) {
                         /*