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mm/vmscan: Account large folios correctly 

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 @@ retry:
*/
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 @@ retry:
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 @@ retry:
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 @@ retry:
* 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 @@ retry:
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;