mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
a664b2d855
Add madvise MADV_NOHUGEPAGE to mark regions that are not important to be hugepage backed. Return -EINVAL if the vma is not of an anonymous type, or the feature isn't built into the kernel. Never silently return success. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
#ifndef _LINUX_KHUGEPAGED_H
|
|
#define _LINUX_KHUGEPAGED_H
|
|
|
|
#include <linux/sched.h> /* MMF_VM_HUGEPAGE */
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
extern int __khugepaged_enter(struct mm_struct *mm);
|
|
extern void __khugepaged_exit(struct mm_struct *mm);
|
|
extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma);
|
|
|
|
#define khugepaged_enabled() \
|
|
(transparent_hugepage_flags & \
|
|
((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
|
|
(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
|
|
#define khugepaged_always() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_FLAG))
|
|
#define khugepaged_req_madv() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
|
|
#define khugepaged_defrag() \
|
|
(transparent_hugepage_flags & \
|
|
(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
|
|
|
|
static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
|
|
{
|
|
if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
|
|
return __khugepaged_enter(mm);
|
|
return 0;
|
|
}
|
|
|
|
static inline void khugepaged_exit(struct mm_struct *mm)
|
|
{
|
|
if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
|
|
__khugepaged_exit(mm);
|
|
}
|
|
|
|
static inline int khugepaged_enter(struct vm_area_struct *vma)
|
|
{
|
|
if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
|
|
if ((khugepaged_always() ||
|
|
(khugepaged_req_madv() &&
|
|
vma->vm_flags & VM_HUGEPAGE)) &&
|
|
!(vma->vm_flags & VM_NOHUGEPAGE))
|
|
if (__khugepaged_enter(vma->vm_mm))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void khugepaged_exit(struct mm_struct *mm)
|
|
{
|
|
}
|
|
static inline int khugepaged_enter(struct vm_area_struct *vma)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
#endif /* _LINUX_KHUGEPAGED_H */
|