mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-02 23:54:33 +01:00
Vijay Balakrishna
4aab2be098
When memory is hotplug added or removed the min_free_kbytes should be
recalculated based on what is expected by khugepaged. Currently after
hotplug, min_free_kbytes will be set to a lower default and higher
default set when THP enabled is lost.
This change restores min_free_kbytes as expected for THP consumers.
[[email protected]: v5]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: f000565adb ("thp: set recommended min free kbytes")
Signed-off-by: Vijay Balakrishna <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Pavel Tatashin <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Allen Pais <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Song Liu <[email protected]>
Cc: <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KHUGEPAGED_H
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#define _LINUX_KHUGEPAGED_H
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#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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extern struct attribute_group khugepaged_attr_group;
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extern int khugepaged_init(void);
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extern void khugepaged_destroy(void);
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extern int start_stop_khugepaged(void);
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extern int __khugepaged_enter(struct mm_struct *mm);
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extern void __khugepaged_exit(struct mm_struct *mm);
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extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
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unsigned long vm_flags);
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extern void khugepaged_min_free_kbytes_update(void);
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#ifdef CONFIG_SHMEM
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extern void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr);
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#else
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static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
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unsigned long addr)
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{
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}
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#endif
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#define khugepaged_enabled() \
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(transparent_hugepage_flags & \
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((1<<TRANSPARENT_HUGEPAGE_FLAG) | \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)))
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#define khugepaged_always() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_FLAG))
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#define khugepaged_req_madv() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))
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#define khugepaged_defrag() \
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(transparent_hugepage_flags & \
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(1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG))
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static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
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{
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if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags))
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return __khugepaged_enter(mm);
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return 0;
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}
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static inline void khugepaged_exit(struct mm_struct *mm)
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{
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if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
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__khugepaged_exit(mm);
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}
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static inline int khugepaged_enter(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
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if ((khugepaged_always() ||
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(khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
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!(vm_flags & VM_NOHUGEPAGE) &&
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!test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
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if (__khugepaged_enter(vma->vm_mm))
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return -ENOMEM;
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return 0;
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}
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#else /* CONFIG_TRANSPARENT_HUGEPAGE */
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static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
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{
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return 0;
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}
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static inline void khugepaged_exit(struct mm_struct *mm)
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{
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}
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static inline int khugepaged_enter(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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return 0;
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}
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static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
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unsigned long vm_flags)
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{
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return 0;
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}
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static inline void collapse_pte_mapped_thp(struct mm_struct *mm,
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unsigned long addr)
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{
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}
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static inline void khugepaged_min_free_kbytes_update(void)
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{
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}
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#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
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#endif /* _LINUX_KHUGEPAGED_H */
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