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mm/rmap: convert page_dup_file_rmap() to folio_dup_file_rmap_[pte|ptes|pmd]()

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Let's convert page_dup_file_rmap() like the other rmap functions.  As
there is only a single caller, convert that single caller right away and
remove page_dup_file_rmap().

Add folio_dup_file_rmap_ptes() right away, we want to perform rmap baching
during fork() soon.

Link: https://lkml.kernel.org/r/20231220224504.646757-34-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>
This commit is contained in:
David Hildenbrand 2023-12-20 23:44:57 +01:00 committed by Andrew Morton
parent 4d8f7418e8
commit d8ef5e311d
2 changed files with 55 additions and 6 deletions
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59
include/linux/rmap.h
View File

@ -308,6 +308,60 @@ static inline void hugetlb_remove_rmap(struct folio *folio)
atomic_dec(&folio->_entire_mapcount);
}
static __always_inline void __folio_dup_file_rmap(struct folio *folio,
struct page *page, int nr_pages, enum rmap_level level)
{
__folio_rmap_sanity_checks(folio, page, nr_pages, level);
switch (level) {
case RMAP_LEVEL_PTE:
do {
atomic_inc(&page->_mapcount);
} while (page++, --nr_pages > 0);
break;
case RMAP_LEVEL_PMD:
atomic_inc(&folio->_entire_mapcount);
break;
}
}
/**
* folio_dup_file_rmap_ptes - duplicate PTE mappings of a page range of a folio
* @folio: The folio to duplicate the mappings of
* @page: The first page to duplicate the mappings of
* @nr_pages: The number of pages of which the mapping will be duplicated
*
* The page range of the folio is defined by [page, page + nr_pages)
*
* The caller needs to hold the page table lock.
*/
static inline void folio_dup_file_rmap_ptes(struct folio *folio,
struct page *page, int nr_pages)
{
__folio_dup_file_rmap(folio, page, nr_pages, RMAP_LEVEL_PTE);
}
#define folio_dup_file_rmap_pte(folio, page) \
folio_dup_file_rmap_ptes(folio, page, 1)
/**
* folio_dup_file_rmap_pmd - duplicate a PMD mapping of a page range of a folio
* @folio: The folio to duplicate the mapping of
* @page: The first page to duplicate the mapping of
*
* The page range of the folio is defined by [page, page + HPAGE_PMD_NR)
*
* The caller needs to hold the page table lock.
*/
static inline void folio_dup_file_rmap_pmd(struct folio *folio,
struct page *page)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
__folio_dup_file_rmap(folio, page, HPAGE_PMD_NR, RMAP_LEVEL_PTE);
#else
WARN_ON_ONCE(true);
#endif
}
static inline void __page_dup_rmap(struct page *page, bool compound)
{
VM_WARN_ON(folio_test_hugetlb(page_folio(page)));
@ -322,11 +376,6 @@ static inline void __page_dup_rmap(struct page *page, bool compound)
}
}
static inline void page_dup_file_rmap(struct page *page, bool compound)
{
__page_dup_rmap(page, compound);
}
/**
* page_try_dup_anon_rmap - try duplicating a mapping of an already mapped
* anonymous page

2
mm/memory.c
View File

@ -965,7 +965,7 @@ copy_present_pte(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma,
rss[MM_ANONPAGES]++;
} else if (page) {
folio_get(folio);
page_dup_file_rmap(page, false);
folio_dup_file_rmap_pte(folio, page);
rss[mm_counter_file(page)]++;
}