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mm/gup: Convert check_and_migrate_movable_pages() to use a folio

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Switch from head pages to folios.  This removes an assumption that
THPs are the only way to have a high-order page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-02-17 12:46:35 -05:00
parent 536939ff51
commit 1b7f7e58de
1 changed files with 14 additions and 13 deletions
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27
mm/gup.c
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@ -1784,43 +1784,44 @@ static long check_and_migrate_movable_pages(unsigned long nr_pages,
unsigned int gup_flags)
{
unsigned long isolation_error_count = 0, i;
struct page *prev_head = NULL;
struct folio *prev_folio = NULL;
LIST_HEAD(movable_page_list);
bool drain_allow = true;
int ret = 0;
for (i = 0; i < nr_pages; i++) {
struct page *head = compound_head(pages[i]);
struct folio *folio = page_folio(pages[i]);
if (head == prev_head)
if (folio == prev_folio)
continue;
prev_head = head;
prev_folio = folio;
if (is_pinnable_page(head))
if (folio_is_pinnable(folio))
continue;
/*
* Try to move out any movable page before pinning the range.
*/
if (PageHuge(head)) {
if (!isolate_huge_page(head, &movable_page_list))
if (folio_test_hugetlb(folio)) {
if (!isolate_huge_page(&folio->page,
&movable_page_list))
isolation_error_count++;
continue;
}
if (!PageLRU(head) && drain_allow) {
if (!folio_test_lru(folio) && drain_allow) {
lru_add_drain_all();
drain_allow = false;
}
if (isolate_lru_page(head)) {
if (folio_isolate_lru(folio)) {
isolation_error_count++;
continue;
}
list_add_tail(&head->lru, &movable_page_list);
mod_node_page_state(page_pgdat(head),
NR_ISOLATED_ANON + page_is_file_lru(head),
thp_nr_pages(head));
list_add_tail(&folio->lru, &movable_page_list);
node_stat_mod_folio(folio,
NR_ISOLATED_ANON + folio_is_file_lru(folio),
folio_nr_pages(folio));
}
if (!list_empty(&movable_page_list) || isolation_error_count)