This gets the statistics correct by modifying the counters by the
number of pages in the folio instead of by 1.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/fs-writeback.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 67f0e88eed01..4f680f848c8b 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -372,7 +372,7 @@ static bool inode_do_switch_wbs(struct inode *inode,
{
struct address_space *mapping = inode->i_mapping;
XA_STATE(xas, &mapping->i_pages, 0);
- struct page *page;
+ struct folio *folio;
bool switched = false;
spin_lock(&inode->i_lock);
@@ -389,21 +389,23 @@ static bool inode_do_switch_wbs(struct inode *inode,
/*
* Count and transfer stats. Note that PAGECACHE_TAG_DIRTY points
- * to possibly dirty pages while PAGECACHE_TAG_WRITEBACK points to
- * pages actually under writeback.
+ * to possibly dirty folios while PAGECACHE_TAG_WRITEBACK points to
+ * folios actually under writeback.
*/
- xas_for_each_marked(&xas, page, ULONG_MAX, PAGECACHE_TAG_DIRTY) {
- if (PageDirty(page)) {
- dec_wb_stat(old_wb, WB_RECLAIMABLE);
- inc_wb_stat(new_wb, WB_RECLAIMABLE);
+ xas_for_each_marked(&xas, folio, ULONG_MAX, PAGECACHE_TAG_DIRTY) {
+ if (folio_test_dirty(folio)) {
+ long nr = folio_nr_pages(folio);
+ wb_stat_mod(old_wb, WB_RECLAIMABLE, -nr);
+ wb_stat_mod(new_wb, WB_RECLAIMABLE, nr);
}
}
xas_set(&xas, 0);
- xas_for_each_marked(&xas, page, ULONG_MAX, PAGECACHE_TAG_WRITEBACK) {
- WARN_ON_ONCE(!PageWriteback(page));
- dec_wb_stat(old_wb, WB_WRITEBACK);
- inc_wb_stat(new_wb, WB_WRITEBACK);
+ xas_for_each_marked(&xas, folio, ULONG_MAX, PAGECACHE_TAG_WRITEBACK) {
+ long nr = folio_nr_pages(folio);
+ WARN_ON_ONCE(!folio_test_writeback(folio));
+ wb_stat_mod(old_wb, WB_WRITEBACK, -nr);
+ wb_stat_mod(new_wb, WB_WRITEBACK, nr);
}
if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
--
2.33.0
