mm/rmap: introduce folio_remove_rmap_[pte|ptes|pmd]()
Let's mimic what we did with folio_add_file_rmap_*() and folio_add_anon_rmap_*() so we can similarly replace page_remove_rmap() next. Make the compiler always special-case on the granularity by using __always_inline. We're adding folio_remove_rmap_ptes() handling right away, as we want to use that soon for batching rmap operations when unmapping PTE-mapped large folios. Link: https://lkml.kernel.org/r/20231220224504.646757-24-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Peter Xu <peterx@redhat.com> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Yin Fengwei <fengwei.yin@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -243,6 +243,12 @@ void folio_add_file_rmap_pmd(struct folio *, struct page *,
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struct vm_area_struct *);
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void page_remove_rmap(struct page *, struct vm_area_struct *,
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bool compound);
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void folio_remove_rmap_ptes(struct folio *, struct page *, int nr_pages,
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struct vm_area_struct *);
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#define folio_remove_rmap_pte(folio, page, vma) \
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folio_remove_rmap_ptes(folio, page, 1, vma)
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void folio_remove_rmap_pmd(struct folio *, struct page *,
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struct vm_area_struct *);
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void hugetlb_add_anon_rmap(struct folio *, struct vm_area_struct *,
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unsigned long address, rmap_t flags);
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74
mm/rmap.c
74
mm/rmap.c
@ -1510,25 +1510,37 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
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bool compound)
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{
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struct folio *folio = page_folio(page);
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if (likely(!compound))
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folio_remove_rmap_pte(folio, page, vma);
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else
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folio_remove_rmap_pmd(folio, page, vma);
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}
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static __always_inline void __folio_remove_rmap(struct folio *folio,
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struct page *page, int nr_pages, struct vm_area_struct *vma,
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enum rmap_level level)
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{
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atomic_t *mapped = &folio->_nr_pages_mapped;
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int nr = 0, nr_pmdmapped = 0;
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bool last;
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int last, nr = 0, nr_pmdmapped = 0;
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enum node_stat_item idx;
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VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio);
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VM_BUG_ON_PAGE(compound && !PageHead(page), page);
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__folio_rmap_sanity_checks(folio, page, nr_pages, level);
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/* Is page being unmapped by PTE? Is this its last map to be removed? */
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if (likely(!compound)) {
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switch (level) {
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case RMAP_LEVEL_PTE:
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do {
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last = atomic_add_negative(-1, &page->_mapcount);
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nr = last;
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if (last && folio_test_large(folio)) {
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nr = atomic_dec_return_relaxed(mapped);
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nr = (nr < COMPOUND_MAPPED);
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last = atomic_dec_return_relaxed(mapped);
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last = (last < COMPOUND_MAPPED);
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}
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} else if (folio_test_pmd_mappable(folio)) {
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/* That test is redundant: it's for safety or to optimize out */
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if (last)
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nr++;
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} while (page++, --nr_pages > 0);
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break;
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case RMAP_LEVEL_PMD:
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last = atomic_add_negative(-1, &folio->_entire_mapcount);
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if (last) {
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nr = atomic_sub_return_relaxed(COMPOUND_MAPPED, mapped);
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@ -1543,6 +1555,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
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nr = 0;
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}
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}
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break;
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}
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if (nr_pmdmapped) {
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@ -1564,7 +1577,7 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
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* is still mapped.
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*/
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if (folio_test_large(folio) && folio_test_anon(folio))
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if (!compound || nr < nr_pmdmapped)
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if (level == RMAP_LEVEL_PTE || nr < nr_pmdmapped)
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deferred_split_folio(folio);
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}
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@ -1579,6 +1592,43 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma,
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munlock_vma_folio(folio, vma);
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}
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/**
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* folio_remove_rmap_ptes - remove PTE mappings from a page range of a folio
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* @folio: The folio to remove the mappings from
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* @page: The first page to remove
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* @nr_pages: The number of pages that will be removed from the mapping
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* @vma: The vm area from which the mappings are removed
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*
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* The page range of the folio is defined by [page, page + nr_pages)
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*
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* The caller needs to hold the page table lock.
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*/
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void folio_remove_rmap_ptes(struct folio *folio, struct page *page,
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int nr_pages, struct vm_area_struct *vma)
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{
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__folio_remove_rmap(folio, page, nr_pages, vma, RMAP_LEVEL_PTE);
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}
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/**
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* folio_remove_rmap_pmd - remove a PMD mapping from a page range of a folio
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* @folio: The folio to remove the mapping from
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* @page: The first page to remove
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* @vma: The vm area from which the mapping is removed
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*
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* The page range of the folio is defined by [page, page + HPAGE_PMD_NR)
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*
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* The caller needs to hold the page table lock.
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*/
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void folio_remove_rmap_pmd(struct folio *folio, struct page *page,
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struct vm_area_struct *vma)
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{
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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__folio_remove_rmap(folio, page, HPAGE_PMD_NR, vma, RMAP_LEVEL_PMD);
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#else
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WARN_ON_ONCE(true);
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#endif
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}
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/*
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* @arg: enum ttu_flags will be passed to this argument
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*/
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