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mm/swap: make __pagevec_lru_add static

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__pagevec_lru_add has no callers outside swap.c, so make it static,
and move it to a more logical position in the file.

Link: https://lkml.kernel.org/r/20220617175020.717127-4-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 18:50:01 +01:00 • committed by akpm
parent c2bc16817a
commit 7d80dd096f
2 changed files with 63 additions and 64 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/linux/pagevec.h
View file

@ -26,7 +26,6 @@ struct pagevec {
}; };
void __pagevec_release(struct pagevec *pvec); void __pagevec_release(struct pagevec *pvec);
void __pagevec_lru_add(struct pagevec *pvec);
unsigned pagevec_lookup_range(struct pagevec *pvec, unsigned pagevec_lookup_range(struct pagevec *pvec,
struct address_space *mapping, struct address_space *mapping,
pgoff_t *start, pgoff_t end); pgoff_t *start, pgoff_t end);

126
mm/swap.c
View file

@ -228,6 +228,69 @@ static bool pagevec_add_and_need_flush(struct pagevec *pvec, struct page *page)
typedef void (*move_fn_t)(struct lruvec *lruvec, struct folio *folio); typedef void (*move_fn_t)(struct lruvec *lruvec, struct folio *folio);
static void __pagevec_lru_add_fn(struct folio *folio, struct lruvec *lruvec)
{
int was_unevictable = folio_test_clear_unevictable(folio);
long nr_pages = folio_nr_pages(folio);
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
folio_set_lru(folio);
/*
* Is an smp_mb__after_atomic() still required here, before
* folio_evictable() tests PageMlocked, to rule out the possibility
* of stranding an evictable folio on an unevictable LRU? I think
* not, because __munlock_page() only clears PageMlocked while the LRU
* lock is held.
*
* (That is not true of __page_cache_release(), and not necessarily
* true of release_pages(): but those only clear PageMlocked after
* put_page_testzero() has excluded any other users of the page.)
*/
if (folio_evictable(folio)) {
if (was_unevictable)
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
} else {
folio_clear_active(folio);
folio_set_unevictable(folio);
/*
* folio->mlock_count = !!folio_test_mlocked(folio)?
* But that leaves __mlock_page() in doubt whether another
* actor has already counted the mlock or not. Err on the
* safe side, underestimate, let page reclaim fix it, rather
* than leaving a page on the unevictable LRU indefinitely.
*/
folio->mlock_count = 0;
if (!was_unevictable)
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
}
lruvec_add_folio(lruvec, folio);
trace_mm_lru_insertion(folio);
}
/*
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
static void __pagevec_lru_add(struct pagevec *pvec)
{
int i;
struct lruvec *lruvec = NULL;
unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
struct folio *folio = page_folio(pvec->pages[i]);
lruvec = folio_lruvec_relock_irqsave(folio, lruvec, &flags);
__pagevec_lru_add_fn(folio, lruvec);
}
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
release_pages(pvec->pages, pvec->nr);
pagevec_reinit(pvec);
}
static void folio_batch_move_lru(struct folio_batch *fbatch, move_fn_t move_fn) static void folio_batch_move_lru(struct folio_batch *fbatch, move_fn_t move_fn)
{ {
int i; int i;
@ -1036,69 +1099,6 @@ void __pagevec_release(struct pagevec *pvec)
} }
EXPORT_SYMBOL(__pagevec_release); EXPORT_SYMBOL(__pagevec_release);
static void __pagevec_lru_add_fn(struct folio *folio, struct lruvec *lruvec)
{
int was_unevictable = folio_test_clear_unevictable(folio);
long nr_pages = folio_nr_pages(folio);
VM_BUG_ON_FOLIO(folio_test_lru(folio), folio);
folio_set_lru(folio);
/*
* Is an smp_mb__after_atomic() still required here, before
* folio_evictable() tests PageMlocked, to rule out the possibility
* of stranding an evictable folio on an unevictable LRU? I think
* not, because __munlock_page() only clears PageMlocked while the LRU
* lock is held.
*
* (That is not true of __page_cache_release(), and not necessarily
* true of release_pages(): but those only clear PageMlocked after
* put_page_testzero() has excluded any other users of the page.)
*/
if (folio_evictable(folio)) {
if (was_unevictable)
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
} else {
folio_clear_active(folio);
folio_set_unevictable(folio);
/*
* folio->mlock_count = !!folio_test_mlocked(folio)?
* But that leaves __mlock_page() in doubt whether another
* actor has already counted the mlock or not. Err on the
* safe side, underestimate, let page reclaim fix it, rather
* than leaving a page on the unevictable LRU indefinitely.
*/
folio->mlock_count = 0;
if (!was_unevictable)
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
}
lruvec_add_folio(lruvec, folio);
trace_mm_lru_insertion(folio);
}
/*
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
void __pagevec_lru_add(struct pagevec *pvec)
{
int i;
struct lruvec *lruvec = NULL;
unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
struct folio *folio = page_folio(pvec->pages[i]);
lruvec = folio_lruvec_relock_irqsave(folio, lruvec, &flags);
__pagevec_lru_add_fn(folio, lruvec);
}
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
release_pages(pvec->pages, pvec->nr);
pagevec_reinit(pvec);
}
/** /**
* folio_batch_remove_exceptionals() - Prune non-folios from a batch. * folio_batch_remove_exceptionals() - Prune non-folios from a batch.
* @fbatch: The batch to prune * @fbatch: The batch to prune