d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
#ifndef __I386_SCHED_H
|
|
#define __I386_SCHED_H
|
|
|
|
#include <asm/desc.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/paravirt.h>
|
|
#ifndef CONFIG_PARAVIRT
|
|
#include <asm-generic/mm_hooks.h>
|
|
|
|
static inline void paravirt_activate_mm(struct mm_struct *prev,
|
|
struct mm_struct *next)
|
|
{
|
|
}
|
|
#endif /* !CONFIG_PARAVIRT */
|
|
|
|
|
|
/*
|
|
* Used for LDT copy/destruction.
|
|
*/
|
|
int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
|
|
void destroy_context(struct mm_struct *mm);
|
|
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
unsigned cpu = smp_processor_id();
|
|
if (per_cpu(cpu_tlbstate, cpu).state == TLBSTATE_OK)
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_LAZY;
|
|
#endif
|
|
}
|
|
|
|
static inline void switch_mm(struct mm_struct *prev,
|
|
struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
|
|
if (likely(prev != next)) {
|
|
/* stop flush ipis for the previous mm */
|
|
cpu_clear(cpu, prev->cpu_vm_mask);
|
|
#ifdef CONFIG_SMP
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
|
|
per_cpu(cpu_tlbstate, cpu).active_mm = next;
|
|
#endif
|
|
cpu_set(cpu, next->cpu_vm_mask);
|
|
|
|
/* Re-load page tables */
|
|
load_cr3(next->pgd);
|
|
|
|
/*
|
|
* load the LDT, if the LDT is different:
|
|
*/
|
|
if (unlikely(prev->context.ldt != next->context.ldt))
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
#ifdef CONFIG_SMP
|
|
else {
|
|
per_cpu(cpu_tlbstate, cpu).state = TLBSTATE_OK;
|
|
BUG_ON(per_cpu(cpu_tlbstate, cpu).active_mm != next);
|
|
|
|
if (!cpu_test_and_set(cpu, next->cpu_vm_mask)) {
|
|
/* We were in lazy tlb mode and leave_mm disabled
|
|
* tlb flush IPI delivery. We must reload %cr3.
|
|
*/
|
|
load_cr3(next->pgd);
|
|
load_LDT_nolock(&next->context);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#define deactivate_mm(tsk, mm) \
|
|
asm("movl %0,%%gs": :"r" (0));
|
|
|
|
#define activate_mm(prev, next) \
|
|
do { \
|
|
paravirt_activate_mm(prev, next); \
|
|
switch_mm((prev),(next),NULL); \
|
|
} while(0);
|
|
|
|
#endif
|