#define __UM_MMU_CONTEXT_H
#include "linux/sched.h"
+#include "linux/config.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)
{
unsigned cpu = smp_processor_id();
if(prev != next){
- clear_bit(cpu, &prev->cpu_vm_mask);
- set_bit(cpu, &next->cpu_vm_mask);
+ cpu_clear(cpu, prev->cpu_vm_mask);
+ 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));
}
}