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mm/swap: convert release_pages to use a folio internally 

This function was already calling compound_head(), but now it can
cache the result of calling compound_head() and avoid calling it again.
Saves 299 bytes of text by avoiding various calls to compound_page()
and avoiding checks of PageTail.

Link: https://lkml.kernel.org/r/20220617175020.717127-14-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-06-17 18:50:11 +01:00 committed by akpm
parent 2397f780e1
commit ab5e653ee8
1 changed files with 16 additions and 18 deletions
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34
mm/swap.c
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@ -941,8 +941,7 @@ void release_pages(struct page **pages, int nr)
unsigned int lock_batch; unsigned int lock_batch;
for (i = 0; i < nr; i++) { for (i = 0; i < nr; i++) {
struct page *page = pages[i]; struct folio *folio = page_folio(pages[i]);
struct folio *folio = page_folio(page);
/* /*
* Make sure the IRQ-safe lock-holding time does not get * Make sure the IRQ-safe lock-holding time does not get
@ -954,35 +953,34 @@ void release_pages(struct page **pages, int nr)
lruvec = NULL; lruvec = NULL;
} }
page = &folio->page; if (is_huge_zero_page(&folio->page))
if (is_huge_zero_page(page))
continue; continue;
if (is_zone_device_page(page)) { if (folio_is_zone_device(folio)) {
if (lruvec) { if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags); unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL; lruvec = NULL;
} }
if (put_devmap_managed_page(page)) if (put_devmap_managed_page(&folio->page))
continue; continue;
if (put_page_testzero(page)) if (folio_put_testzero(folio))
free_zone_device_page(page); free_zone_device_page(&folio->page);
continue; continue;
} }
if (!put_page_testzero(page)) if (!folio_put_testzero(folio))
continue; continue;
if (PageCompound(page)) { if (folio_test_large(folio)) {
if (lruvec) { if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags); unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL; lruvec = NULL;
} }
__put_compound_page(page); __put_compound_page(&folio->page);
continue; continue;
} }
if (PageLRU(page)) { if (folio_test_lru(folio)) {
struct lruvec *prev_lruvec = lruvec; struct lruvec *prev_lruvec = lruvec;
lruvec = folio_lruvec_relock_irqsave(folio, lruvec, lruvec = folio_lruvec_relock_irqsave(folio, lruvec,
@ -990,8 +988,8 @@ void release_pages(struct page **pages, int nr)
if (prev_lruvec != lruvec) if (prev_lruvec != lruvec)
lock_batch = 0; lock_batch = 0;
del_page_from_lru_list(page, lruvec); lruvec_del_folio(lruvec, folio);
__clear_page_lru_flags(page); __folio_clear_lru_flags(folio);
} }
/* /*
@ -1000,13 +998,13 @@ void release_pages(struct page **pages, int nr)
* found set here. This does not indicate a problem, unless * found set here. This does not indicate a problem, unless
* "unevictable_pgs_cleared" appears worryingly large. * "unevictable_pgs_cleared" appears worryingly large.
*/ */
if (unlikely(PageMlocked(page))) { if (unlikely(folio_test_mlocked(folio))) {
__ClearPageMlocked(page); __folio_clear_mlocked(folio);
dec_zone_page_state(page, NR_MLOCK); zone_stat_sub_folio(folio, NR_MLOCK);
count_vm_event(UNEVICTABLE_PGCLEARED); count_vm_event(UNEVICTABLE_PGCLEARED);
} }
list_add(&page->lru, &pages_to_free); list_add(&folio->lru, &pages_to_free);
} }
if (lruvec) if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags); unlock_page_lruvec_irqrestore(lruvec, flags);