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However, the s390 architecture benefits from knowing the exact page table entries being modified. Introduce lazy_mmu_mode_enable_for_pte_range(), which is provided with the process address space and the page table being operated on. This information is required to enable s390-specific optimizations. The function takes parameters that are typically passed to page- table level walkers, which implies that the span of PTE entries never crosses a page table boundary. Architectures that do not require such information simply do not need to define the lazy_mmu_mode_enable_for_pte_range() callback. Signed-off-by: Alexander Gordeev --- fs/proc/task_mmu.c | 2 +- include/linux/pgtable.h | 47 +++++++++++++++++++++++++++++++++++++++++ mm/madvise.c | 8 +++---- mm/memory.c | 8 +++---- mm/mprotect.c | 2 +- mm/mremap.c | 2 +- mm/vmalloc.c | 6 +++--- 7 files changed, 61 insertions(+), 14 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index e091931d7ca1..799db0d7ec8b 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -2752,7 +2752,7 @@ static int pagemap_scan_pmd_entry(pmd_t *pmd, unsig= ned long start, return 0; } =20 - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(vma->vm_mm, start, end, start_pte); =20 if ((p->arg.flags & PM_SCAN_WP_MATCHING) && !p->vec_out) { /* Fast path for performing exclusive WP */ diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index a50df42a893f..9ff7b78d65b1 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -271,6 +271,51 @@ static inline void lazy_mmu_mode_enable(void) arch_enter_lazy_mmu_mode(); } =20 +#ifndef arch_enter_lazy_mmu_mode_for_pte_range +static inline void arch_enter_lazy_mmu_mode_for_pte_range(struct mm_stru= ct *mm, + unsigned long addr, unsigned long end, pte_t *ptep) +{ + arch_enter_lazy_mmu_mode(); +} +#endif + +/** + * lazy_mmu_mode_enable_for_pte_range() - Enable the lazy MMU mode with = a speedup hint. + * @mm: Address space the pages are mapped into. + * @addr: Start address of the range. + * @end: End address of the range. + * @ptep: Page table pointer for the first entry. + * + * Enters a new lazy MMU mode section; if the mode was not already enabl= ed, + * enables it and calls arch_enter_lazy_mmu_mode_for_pte_range(). + * + * PTEs that fall within the specified range might observe update speedu= ps. + * The PTE range must belong to the specified memory space and not cross + * a page table boundary. + * + * There are no requirements on the order or range completeness of PTE + * updates for the specified range. + * + * Must be paired with a call to lazy_mmu_mode_disable(). + * + * Has no effect if called: + * - While paused - see lazy_mmu_mode_pause() + * - In interrupt context + */ +static inline void lazy_mmu_mode_enable_for_pte_range(struct mm_struct *= mm, + unsigned long addr, unsigned long end, pte_t *ptep) +{ + struct lazy_mmu_state *state =3D ¤t->lazy_mmu_state; + + if (in_interrupt() || state->pause_count > 0) + return; + + VM_WARN_ON_ONCE(state->enable_count =3D=3D U8_MAX); + + if (state->enable_count++ =3D=3D 0) + arch_enter_lazy_mmu_mode_for_pte_range(mm, addr, end, ptep); +} + /** * lazy_mmu_mode_disable() - Disable the lazy MMU mode. * @@ -353,6 +398,8 @@ static inline void lazy_mmu_mode_resume(void) } #else static inline void lazy_mmu_mode_enable(void) {} +static inline void lazy_mmu_mode_enable_for_pte_range(struct mm_struct *= mm, + unsigned long addr, unsigned long end, pte_t *ptep) {} static inline void lazy_mmu_mode_disable(void) {} static inline void lazy_mmu_mode_pause(void) {} static inline void lazy_mmu_mode_resume(void) {} diff --git a/mm/madvise.c b/mm/madvise.c index dbb69400786d..7faac3a627ff 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -451,7 +451,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *p= md, if (!start_pte) return 0; flush_tlb_batched_pending(mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, start_pte); for (; addr < end; pte +=3D nr, addr +=3D nr * PAGE_SIZE) { nr =3D 1; ptent =3D ptep_get(pte); @@ -506,7 +506,7 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *p= md, if (!start_pte) break; flush_tlb_batched_pending(mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, start_pte); if (!err) nr =3D 0; continue; @@ -673,7 +673,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigne= d long addr, if (!start_pte) return 0; flush_tlb_batched_pending(mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, start_pte); for (; addr !=3D end; pte +=3D nr, addr +=3D PAGE_SIZE * nr) { nr =3D 1; ptent =3D ptep_get(pte); @@ -733,7 +733,7 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigne= d long addr, if (!start_pte) break; flush_tlb_batched_pending(mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, pte); if (!err) nr =3D 0; continue; diff --git a/mm/memory.c b/mm/memory.c index c65e82c86fed..4c0f266df92a 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1269,7 +1269,7 @@ copy_pte_range(struct vm_area_struct *dst_vma, stru= ct vm_area_struct *src_vma, spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING); orig_src_pte =3D src_pte; orig_dst_pte =3D dst_pte; - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(src_mm, addr, end, src_pte); =20 do { nr =3D 1; @@ -1917,7 +1917,7 @@ static unsigned long zap_pte_range(struct mmu_gathe= r *tlb, return addr; =20 flush_tlb_batched_pending(mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, start_pte); do { bool any_skipped =3D false; =20 @@ -2875,7 +2875,7 @@ static int remap_pte_range(struct mm_struct *mm, pm= d_t *pmd, mapped_pte =3D pte =3D pte_alloc_map_lock(mm, pmd, addr, &ptl); if (!pte) return -ENOMEM; - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, mapped_pte); do { BUG_ON(!pte_none(ptep_get(pte))); if (!pfn_modify_allowed(pfn, prot)) { @@ -3235,7 +3235,7 @@ static int apply_to_pte_range(struct mm_struct *mm,= pmd_t *pmd, return -EINVAL; } =20 - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, addr, end, mapped_pte); =20 if (fn) { do { diff --git a/mm/mprotect.c b/mm/mprotect.c index c0571445bef7..a7bfb4516dc5 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -233,7 +233,7 @@ static long change_pte_range(struct mmu_gather *tlb, is_private_single_threaded =3D vma_is_single_threaded_private(vma); =20 flush_tlb_batched_pending(vma->vm_mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(vma->vm_mm, addr, end, pte); do { nr_ptes =3D 1; oldpte =3D ptep_get(pte); diff --git a/mm/mremap.c b/mm/mremap.c index 2be876a70cc0..16320242da51 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -260,7 +260,7 @@ static int move_ptes(struct pagetable_move_control *p= mc, if (new_ptl !=3D old_ptl) spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING); flush_tlb_batched_pending(vma->vm_mm); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(mm, old_addr, old_end, old_ptep); =20 for (; old_addr < old_end; old_ptep +=3D nr_ptes, old_addr +=3D nr_ptes= * PAGE_SIZE, new_ptep +=3D nr_ptes, new_addr +=3D nr_ptes * PAGE_SIZE) { diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 61caa55a4402..35a23044a969 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -108,7 +108,7 @@ static int vmap_pte_range(pmd_t *pmd, unsigned long a= ddr, unsigned long end, if (!pte) return -ENOMEM; =20 - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(&init_mm, addr, end, pte); =20 do { if (unlikely(!pte_none(ptep_get(pte)))) { @@ -371,7 +371,7 @@ static void vunmap_pte_range(pmd_t *pmd, unsigned lon= g addr, unsigned long end, unsigned long size =3D PAGE_SIZE; =20 pte =3D pte_offset_kernel(pmd, addr); - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(&init_mm, addr, end, pte); =20 do { #ifdef CONFIG_HUGETLB_PAGE @@ -538,7 +538,7 @@ static int vmap_pages_pte_range(pmd_t *pmd, unsigned = long addr, if (!pte) return -ENOMEM; =20 - lazy_mmu_mode_enable(); + lazy_mmu_mode_enable_for_pte_range(&init_mm, addr, end, pte); =20 do { struct page *page =3D pages[*nr]; --=20 2.51.0