search for: prep_transhuge_pag

...v 05, 2020 at 04:51:42PM -0800, Ralph Campbell wrote: > Add a helper function to allow device drivers to create device private > transparent huge pages. This is intended to help support device private > THP migrations. I think you'd be better off with these calling conventions: -void prep_transhuge_page(struct page *page) +struct page *thp_prep(struct page *page) { + if (!page || compound_order(page) == 0) + return page; /* - * we use page->mapping and page->indexlru in second tail page + * we use page->mapping and page->index in second tail...

...insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 87b42c81dedc..126e54da4fee 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -187,6 +187,7 @@ extern unsigned long thp_get_unmapped_area(struct file *filp, unsigned long flags); extern void prep_transhuge_page(struct page *page); +extern void prep_transhuge_device_private_page(struct page *page); extern void free_transhuge_page(struct page *page); bool is_transparent_hugepage(struct page *page); @@ -382,6 +383,10 @@ static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, static inli...

...insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 0365aa97f8e7..3ec26ef27a93 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -184,6 +184,7 @@ extern unsigned long thp_get_unmapped_area(struct file *filp, unsigned long flags); extern void prep_transhuge_page(struct page *page); +extern void prep_transhuge_device_private_page(struct page *page); extern void free_transhuge_page(struct page *page); bool is_transparent_hugepage(struct page *page); @@ -377,6 +378,10 @@ static inline bool transhuge_vma_suitable(struct vm_area_struct *vma, static inli...

...> +struct page *alloc_transhugepage(struct vm_area_struct *vma, > + unsigned long haddr) > +{ > + gfp_t gfp; > + struct page *page; > + > + gfp = alloc_hugepage_direct_gfpmask(vma); > + page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER); > + if (page) > + prep_transhuge_page(page); > + return page; > +} > +EXPORT_SYMBOL_GPL(alloc_transhugepage); > +#endif > + > static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, > pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write, > pgtable_t pgtable) > -- > 2.20.1 Why use C...

...p); } +#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +struct page *alloc_transhugepage(struct vm_area_struct *vma, + unsigned long haddr) +{ + gfp_t gfp; + struct page *page; + + gfp = alloc_hugepage_direct_gfpmask(vma); + page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER); + if (page) + prep_transhuge_page(page); + return page; +} +EXPORT_SYMBOL_GPL(alloc_transhugepage); +#endif + static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write, pgtable_t pgtable) -- 2.20.1

..._do_huge_pmd_anonymous_page(vmf, page, gfp); } +struct page *alloc_transhugepage(struct vm_area_struct *vma, + unsigned long haddr) +{ + gfp_t gfp; + struct page *page; + + gfp = alloc_hugepage_direct_gfpmask(vma); + page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER); + if (page) + prep_transhuge_page(page); + return page; +} +EXPORT_SYMBOL_GPL(alloc_transhugepage); + static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmd, pfn_t pfn, pgprot_t prot, bool write, pgtable_t pgtable) -- 2.20.1

On Thu, Nov 05, 2020 at 04:51:42PM -0800, Ralph Campbell wrote: > +extern void prep_transhuge_device_private_page(struct page *page); No need for the extern. > +static inline void prep_transhuge_device_private_page(struct page *page) > +{ > +} Is the code to call this even reachable if THP support is configured out? If not just declaring it unconditionally and letting dead code

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. Earlier versions were posted previously [1] and [2]. The patches apply cleanly to the linux-mm 5.10.0-rc2 tree. There are a lot of other THP patches being posted. I don't think there are any semantic conflicts but there may be some merge conflicts depending on

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. An earlier version was posted previously [1]. This version now supports splitting a THP midway in the migration process which led to a number of changes. The patches apply cleanly to the current linux-mm tree. Since there are a couple of patches in linux-mm from Dan

...d_t *pmdp) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned int i; + spinlock_t *ptl; + bool flush = false; + pgtable_t pgtable; + gfp_t gfp; + pmd_t entry; + + if (WARN_ON_ONCE(compound_order(page) != HPAGE_PMD_ORDER)) + goto abort; + + if (unlikely(anon_vma_prepare(vma))) + goto abort; + + prep_transhuge_page(page); + + gfp = GFP_TRANSHUGE_LIGHT; + if (mem_cgroup_charge(page, mm, gfp)) + goto abort; + + pgtable = pte_alloc_one(mm); + if (unlikely(!pgtable)) + goto abort; + + __SetPageUptodate(page); + + if (is_zone_device_page(page)) { + if (!is_device_private_page(page)) + goto pgtable_abort; +...

...int i; > + spinlock_t *ptl; > + bool flush = false; > + pgtable_t pgtable; > + gfp_t gfp; > + pmd_t entry; > + > + if (WARN_ON_ONCE(compound_order(page) != HPAGE_PMD_ORDER)) > + goto abort; > + > + if (unlikely(anon_vma_prepare(vma))) > + goto abort; > + > + prep_transhuge_page(page); > + > + gfp = GFP_TRANSHUGE_LIGHT; > + if (mem_cgroup_charge(page, mm, gfp)) > + goto abort; > + > + pgtable = pte_alloc_one(mm); > + if (unlikely(!pgtable)) > + goto abort; > + > + __SetPageUptodate(page); > + > + if (is_zone_device_page(page)) { >...

These patches apply to linux-5.8.0-rc1. Patches 1-3 should probably go into 5.8, the others can be queued for 5.9. Patches 4-6 improve the HMM self tests. Patch 7-8 prepare nouveau for the meat of this series which adds support and testing for compound page mapping of system memory (patches 9-11) and compound page migration to device private memory (patches 12-16). Since these changes are split

...d_t *pmdp) +{ + struct mm_struct *mm = vma->vm_mm; + unsigned int i; + spinlock_t *ptl; + bool flush = false; + pgtable_t pgtable; + gfp_t gfp; + pmd_t entry; + + if (WARN_ON_ONCE(compound_order(page) != HPAGE_PMD_ORDER)) + goto abort; + + if (unlikely(anon_vma_prepare(vma))) + goto abort; + + prep_transhuge_page(page); + + gfp = GFP_TRANSHUGE_LIGHT; + if (mem_cgroup_charge(page, mm, gfp)) + goto abort; + + pgtable = pte_alloc_one(mm); + if (unlikely(!pgtable)) + goto abort; + + __SetPageUptodate(page); + + if (is_zone_device_page(page)) { + if (!is_device_private_page(page)) + goto pgtable_abort; +...