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mm: non-pmd-mappable, large folios for folio_add_new_anon_rmap() 

In preparation for supporting anonymous multi-size THP, improve
folio_add_new_anon_rmap() to allow a non-pmd-mappable, large folio to be
passed to it.  In this case, all contained pages are accounted using the
order-0 folio (or base page) scheme.

Link: https://lkml.kernel.org/r/20231207161211.2374093-3-ryan.roberts@arm.com
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Barry Song <v-songbaohua@oppo.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Itaru Kitayama <itaru.kitayama@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ryan Roberts 2023-12-07 16:12:03 +00:00 committed by Andrew Morton
parent 7dc7c5ef64
commit 372cbd4d5a
1 changed files with 20 additions and 8 deletions
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28
mm/rmap.c
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@ -1305,32 +1305,44 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
* This means the inc-and-test can be bypassed.
* The folio does not have to be locked.
*
* If the folio is large, it is accounted as a THP. As the folio
* If the folio is pmd-mappable, it is accounted as a THP. As the folio
* is new, it's assumed to be mapped exclusively by a single process.
*/
void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
unsigned long address)
{
int nr;
int nr = folio_nr_pages(folio);
VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma);
VM_BUG_ON_VMA(address < vma->vm_start ||
address + (nr << PAGE_SHIFT) > vma->vm_end, vma);
__folio_set_swapbacked(folio);
__folio_set_anon(folio, vma, address, true);
if (likely(!folio_test_pmd_mappable(folio))) {
if (likely(!folio_test_large(folio))) {
/* increment count (starts at -1) */
atomic_set(&folio->_mapcount, 0);
nr = 1;
SetPageAnonExclusive(&folio->page);
} else if (!folio_test_pmd_mappable(folio)) {
int i;
for (i = 0; i < nr; i++) {
struct page *page = folio_page(folio, i);
/* increment count (starts at -1) */
atomic_set(&page->_mapcount, 0);
SetPageAnonExclusive(page);
}
atomic_set(&folio->_nr_pages_mapped, nr);
} else {
/* increment count (starts at -1) */
atomic_set(&folio->_entire_mapcount, 0);
atomic_set(&folio->_nr_pages_mapped, COMPOUND_MAPPED);
nr = folio_nr_pages(folio);
SetPageAnonExclusive(&folio->page);
__lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr);
}
__lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr);
__folio_set_anon(folio, vma, address, true);
SetPageAnonExclusive(&folio->page);
}
/**