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mm/vmscan: Account large folios correctly

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The statistics we gather should count the number of pages, not the
number of folios.  The logic in this function is somewhat convoluted,
but even if we split the folio, I think the accounting is now correct.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-17 14:46:55 -05:00
parent 343b288834
commit c79b7b96db
1 changed files with 6 additions and 6 deletions
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12
mm/vmscan.c
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@ -1575,10 +1575,10 @@ static unsigned int shrink_page_list(struct list_head *page_list,
*/
folio_check_dirty_writeback(folio, &dirty, &writeback);
if (dirty || writeback)
stat->nr_dirty++;
stat->nr_dirty += nr_pages;
if (dirty && !writeback)
stat->nr_unqueued_dirty++;
stat->nr_unqueued_dirty += nr_pages;
/*
* Treat this page as congested if the underlying BDI is or if
@ -1590,7 +1590,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (((dirty || writeback) && mapping &&
inode_write_congested(mapping->host)) ||
(writeback && PageReclaim(page)))
stat->nr_congested++;
stat->nr_congested += nr_pages;
/*
* If a page at the tail of the LRU is under writeback, there
@ -1639,7 +1639,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
if (current_is_kswapd() &&
PageReclaim(page) &&
test_bit(PGDAT_WRITEBACK, &pgdat->flags)) {
stat->nr_immediate++;
stat->nr_immediate += nr_pages;
goto activate_locked;
/* Case 2 above */
@ -1657,7 +1657,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
* and it's also appropriate in global reclaim.
*/
SetPageReclaim(page);
stat->nr_writeback++;
stat->nr_writeback += nr_pages;
goto activate_locked;
/* Case 3 above */
@ -1823,7 +1823,7 @@ static unsigned int shrink_page_list(struct list_head *page_list,
case PAGE_ACTIVATE:
goto activate_locked;
case PAGE_SUCCESS:
stat->nr_pageout += thp_nr_pages(page);
stat->nr_pageout += nr_pages;
if (PageWriteback(page))
goto keep;