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mm/swap: convert lru_deactivate_file to a folio_batch

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Use a folio throughout lru_deactivate_file_fn(), removing many hidden
calls to compound_head().  Shrinks the kernel by 864 bytes of text.

Link: https://lkml.kernel.org/r/20220617175020.717127-6-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 18:50:03 +01:00 • committed by akpm
parent 70dea5346e
commit 7a3dbfe8a5
1 changed files with 39 additions and 43 deletions
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82
mm/swap.c
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@ -62,7 +62,7 @@ static DEFINE_PER_CPU(struct lru_rotate, lru_rotate) = {
struct lru_pvecs { struct lru_pvecs {
local_lock_t lock; local_lock_t lock;
struct folio_batch lru_add; struct folio_batch lru_add;
struct pagevec lru_deactivate_file; struct folio_batch lru_deactivate_file;
struct pagevec lru_deactivate; struct pagevec lru_deactivate;
struct pagevec lru_lazyfree; struct pagevec lru_lazyfree;
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
@ -562,56 +562,57 @@ void lru_cache_add_inactive_or_unevictable(struct page *page,
} }
/* /*
* If the page can not be invalidated, it is moved to the * If the folio cannot be invalidated, it is moved to the
* inactive list to speed up its reclaim. It is moved to the * inactive list to speed up its reclaim. It is moved to the
* head of the list, rather than the tail, to give the flusher * head of the list, rather than the tail, to give the flusher
* threads some time to write it out, as this is much more * threads some time to write it out, as this is much more
* effective than the single-page writeout from reclaim. * effective than the single-page writeout from reclaim.
* *
* If the page isn't page_mapped and dirty/writeback, the page * If the folio isn't mapped and dirty/writeback, the folio
* could reclaim asap using PG_reclaim. * could be reclaimed asap using the reclaim flag.
* *
* 1. active, mapped page -> none * 1. active, mapped folio -> none
* 2. active, dirty/writeback page -> inactive, head, PG_reclaim * 2. active, dirty/writeback folio -> inactive, head, reclaim
* 3. inactive, mapped page -> none * 3. inactive, mapped folio -> none
* 4. inactive, dirty/writeback page -> inactive, head, PG_reclaim * 4. inactive, dirty/writeback folio -> inactive, head, reclaim
* 5. inactive, clean -> inactive, tail * 5. inactive, clean -> inactive, tail
* 6. Others -> none * 6. Others -> none
* *
* In 4, why it moves inactive's head, the VM expects the page would * In 4, it moves to the head of the inactive list so the folio is
* be write it out by flusher threads as this is much more effective * written out by flusher threads as this is much more efficient
* than the single-page writeout from reclaim. * than the single-page writeout from reclaim.
*/ */
static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec) static void lru_deactivate_file_fn(struct lruvec *lruvec, struct folio *folio)
{ {
bool active = PageActive(page); bool active = folio_test_active(folio);
int nr_pages = thp_nr_pages(page); long nr_pages = folio_nr_pages(folio);
if (PageUnevictable(page)) if (folio_test_unevictable(folio))
return; return;
/* Some processes are using the page */ /* Some processes are using the folio */
if (page_mapped(page)) if (folio_mapped(folio))
return; return;
del_page_from_lru_list(page, lruvec); lruvec_del_folio(lruvec, folio);
ClearPageActive(page); folio_clear_active(folio);
ClearPageReferenced(page); folio_clear_referenced(folio);
if (PageWriteback(page) || PageDirty(page)) { if (folio_test_writeback(folio) || folio_test_dirty(folio)) {
/* /*
* PG_reclaim could be raced with end_page_writeback * Setting the reclaim flag could race with
* It can make readahead confusing. But race window * folio_end_writeback() and confuse readahead. But the
* is _really_ small and it's non-critical problem. * race window is _really_ small and it's not a critical
* problem.
*/ */
add_page_to_lru_list(page, lruvec); lruvec_add_folio(lruvec, folio);
SetPageReclaim(page); folio_set_reclaim(folio);
} else { } else {
/* /*
* The page's writeback ends up during pagevec * The folio's writeback ended while it was in the batch.
* We move that page into tail of inactive. * We move that folio to the tail of the inactive list.
*/ */
add_page_to_lru_list_tail(page, lruvec); lruvec_add_folio_tail(lruvec, folio);
__count_vm_events(PGROTATED, nr_pages); __count_vm_events(PGROTATED, nr_pages);
} }
@ -685,9 +686,9 @@ void lru_add_drain_cpu(int cpu)
local_unlock_irqrestore(&lru_rotate.lock, flags); local_unlock_irqrestore(&lru_rotate.lock, flags);
} }
pvec = &per_cpu(lru_pvecs.lru_deactivate_file, cpu); fbatch = &per_cpu(lru_pvecs.lru_deactivate_file, cpu);
if (pagevec_count(pvec)) if (folio_batch_count(fbatch))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn); folio_batch_move_lru(fbatch, lru_deactivate_file_fn);
pvec = &per_cpu(lru_pvecs.lru_deactivate, cpu); pvec = &per_cpu(lru_pvecs.lru_deactivate, cpu);
if (pagevec_count(pvec)) if (pagevec_count(pvec))
@ -701,32 +702,27 @@ void lru_add_drain_cpu(int cpu)
} }
/** /**
* deactivate_file_folio() - Forcefully deactivate a file folio. * deactivate_file_folio() - Deactivate a file folio.
* @folio: Folio to deactivate. * @folio: Folio to deactivate.
* *
* This function hints to the VM that @folio is a good reclaim candidate, * This function hints to the VM that @folio is a good reclaim candidate,
* for example if its invalidation fails due to the folio being dirty * for example if its invalidation fails due to the folio being dirty
* or under writeback. * or under writeback.
* *
* Context: Caller holds a reference on the page. * Context: Caller holds a reference on the folio.
*/ */
void deactivate_file_folio(struct folio *folio) void deactivate_file_folio(struct folio *folio)
{ {
struct pagevec *pvec; struct folio_batch *fbatch;
/* /* Deactivating an unevictable folio will not accelerate reclaim */
* In a workload with many unevictable pages such as mprotect,
* unevictable folio deactivation for accelerating reclaim is pointless.
*/
if (folio_test_unevictable(folio)) if (folio_test_unevictable(folio))
return; return;
folio_get(folio); folio_get(folio);
local_lock(&lru_pvecs.lock); local_lock(&lru_pvecs.lock);
pvec = this_cpu_ptr(&lru_pvecs.lru_deactivate_file); fbatch = this_cpu_ptr(&lru_pvecs.lru_deactivate_file);
folio_batch_add_and_move(fbatch, folio, lru_deactivate_file_fn);
if (pagevec_add_and_need_flush(pvec, &folio->page))
pagevec_lru_move_fn(pvec, lru_deactivate_file_fn);
local_unlock(&lru_pvecs.lock); local_unlock(&lru_pvecs.lock);
} }
@ -899,7 +895,7 @@ static inline void __lru_add_drain_all(bool force_all_cpus)
if (folio_batch_count(&per_cpu(lru_pvecs.lru_add, cpu)) || if (folio_batch_count(&per_cpu(lru_pvecs.lru_add, cpu)) ||
data_race(folio_batch_count(&per_cpu(lru_rotate.fbatch, cpu))) || data_race(folio_batch_count(&per_cpu(lru_rotate.fbatch, cpu))) ||
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) || folio_batch_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) ||
pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) ||
need_activate_page_drain(cpu) || need_activate_page_drain(cpu) ||