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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-01-11 14:28:52 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:32:56 -0800 |
| commit | ee0800c2f6a9e605947ce499d79fb7e2be16d6dd (patch) | |
| tree | c443b0b1c6eba14398cf2750ba2db9c2afccf06e /mm/rmap.c | |
| parent | 62beb906ef644b0f0555b2b9f9626c27e2038d84 (diff) | |
| download | lwn-ee0800c2f6a9e605947ce499d79fb7e2be16d6dd.tar.gz lwn-ee0800c2f6a9e605947ce499d79fb7e2be16d6dd.zip | |
mm: convert page_add_anon_rmap() to use a folio internally
The API for page_add_anon_rmap() needs to be page-based, because we can
add mappings of individual pages. But inside the function, we want to
only call compound_head() once and then use the folio APIs instead of the
page APIs that each call compound_head().
Link: https://lkml.kernel.org/r/20230111142915.1001531-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 7762ab8371c0..7d5e0bf98c1e 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1207,10 +1207,11 @@ static void __page_check_anon_rmap(struct page *page, * and to ensure that PageAnon is not being upgraded racily to PageKsm * (but PageKsm is never downgraded to PageAnon). */ -void page_add_anon_rmap(struct page *page, - struct vm_area_struct *vma, unsigned long address, rmap_t flags) +void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, + unsigned long address, rmap_t flags) { - atomic_t *mapped; + struct folio *folio = page_folio(page); + atomic_t *mapped = &folio->_nr_pages_mapped; int nr = 0, nr_pmdmapped = 0; bool compound = flags & RMAP_COMPOUND; bool first = true; @@ -1219,20 +1220,18 @@ void page_add_anon_rmap(struct page *page, if (likely(!compound)) { first = atomic_inc_and_test(&page->_mapcount); nr = first; - if (first && PageCompound(page)) { - mapped = subpages_mapcount_ptr(compound_head(page)); + if (first && folio_test_large(folio)) { nr = atomic_inc_return_relaxed(mapped); nr = (nr < COMPOUND_MAPPED); } - } else if (PageTransHuge(page)) { + } else if (folio_test_pmd_mappable(folio)) { /* That test is redundant: it's for safety or to optimize out */ - first = atomic_inc_and_test(compound_mapcount_ptr(page)); + first = atomic_inc_and_test(&folio->_entire_mapcount); if (first) { - mapped = subpages_mapcount_ptr(page); nr = atomic_add_return_relaxed(COMPOUND_MAPPED, mapped); if (likely(nr < COMPOUND_MAPPED + COMPOUND_MAPPED)) { - nr_pmdmapped = thp_nr_pages(page); + nr_pmdmapped = folio_nr_pages(folio); nr = nr_pmdmapped - (nr & FOLIO_PAGES_MAPPED); /* Raced ahead of a remove and another add? */ if (unlikely(nr < 0)) @@ -1248,11 +1247,11 @@ void page_add_anon_rmap(struct page *page, VM_BUG_ON_PAGE(!first && PageAnonExclusive(page), page); if (nr_pmdmapped) - __mod_lruvec_page_state(page, NR_ANON_THPS, nr_pmdmapped); + __lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr_pmdmapped); if (nr) - __mod_lruvec_page_state(page, NR_ANON_MAPPED, nr); + __lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr); - if (likely(!PageKsm(page))) { + if (likely(!folio_test_ksm(folio))) { /* address might be in next vma when migration races vma_adjust */ if (first) __page_set_anon_rmap(page, vma, address, |