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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2023-10-11 09:50:59 +0200 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2023-10-11 09:50:59 +0200 |
| commit | 57390019b68b83f96eb98f490367b9df1f2d77cb (patch) | |
| tree | e6d4b6c75efdd2d7fb7d37f980688c491be3ff6a /include/linux/ksm.h | |
| parent | e5f9d543419c78ac58f3b3557bc5a76b20ff600b (diff) | |
| parent | 389af786f92ecdff35883551d54bf4e507ffcccb (diff) | |
Merge drm/drm-next into drm-misc-next
Updating drm-misc-next to the state of Linux v6.6-rc2.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Diffstat (limited to 'include/linux/ksm.h')
| -rw-r--r-- | include/linux/ksm.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/ksm.h b/include/linux/ksm.h index 899a314bc487..c2dd786a30e1 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -26,6 +26,22 @@ int ksm_disable(struct mm_struct *mm); int __ksm_enter(struct mm_struct *mm); void __ksm_exit(struct mm_struct *mm); +/* + * To identify zeropages that were mapped by KSM, we reuse the dirty bit + * in the PTE. If the PTE is dirty, the zeropage was mapped by KSM when + * deduplicating memory. + */ +#define is_ksm_zero_pte(pte) (is_zero_pfn(pte_pfn(pte)) && pte_dirty(pte)) + +extern unsigned long ksm_zero_pages; + +static inline void ksm_might_unmap_zero_page(struct mm_struct *mm, pte_t pte) +{ + if (is_ksm_zero_pte(pte)) { + ksm_zero_pages--; + mm->ksm_zero_pages--; + } +} static inline int ksm_fork(struct mm_struct *mm, struct mm_struct *oldmm) { @@ -95,6 +111,10 @@ static inline void ksm_exit(struct mm_struct *mm) { } +static inline void ksm_might_unmap_zero_page(struct mm_struct *mm, pte_t pte) +{ +} + #ifdef CONFIG_MEMORY_FAILURE static inline void collect_procs_ksm(struct page *page, struct list_head *to_kill, int force_early) |