fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / asm-um / mmu_context.h

diff --git a/include/asm-um/mmu_context.h b/include/asm-um/mmu_context.h
index 89bff31..f709c78 100644 (file)
--- a/include/asm-um/mmu_context.h
+++ b/include/asm-um/mmu_context.h
@@ -8,18 +8,30 @@
 
 #include "linux/sched.h"
 #include "choose-mode.h"
+#include "um_mmu.h"
 
 #define get_mmu_context(task) do ; while(0)
 #define activate_context(tsk) do ; while(0)
 
 #define deactivate_mm(tsk,mm)  do { } while (0)
 
+extern void force_flush_all(void);
+
 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 {
+       /*
+        * This is called by fs/exec.c and fs/aio.c. In the first case, for an
+        * exec, we don't need to do anything as we're called from userspace
+        * and thus going to use a new host PID. In the second, we're called
+        * from a kernel thread, and thus need to go doing the mmap's on the
+        * host. Since they're very expensive, we want to avoid that as far as
+        * possible.
+        */
+       if (old != new && (current->flags & PF_BORROWED_MM))
+               CHOOSE_MODE(force_flush_all(),
+                           switch_mm_skas(&new->context.skas.id));
 }
 
-extern void switch_mm_skas(int mm_fd);
-
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
                             struct task_struct *tsk)
 {
@@ -30,7 +42,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
                cpu_set(cpu, next->cpu_vm_mask);
                if(next != &init_mm)
                        CHOOSE_MODE((void) 0, 
-                                   switch_mm_skas(next->context.skas.mm_fd));
+                                   switch_mm_skas(&next->context.skas.id));
        }
 }