[PATCH 05/10] writeback: call domain_dirty_avail in balance_dirty_pages

[Kemeng Shi]

Call domain_dirty_avail in balance_dirty_pages to remove repeated code.
This is also a preparation to factor out repeated code calculating
dirty limits in balance_dirty_pages.

Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
---
 mm/page-writeback.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index a1d48e8387ed..c41db87f4e98 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1747,9 +1747,8 @@ static int balance_dirty_pages(struct bdi_writeback *wb,
 		unsigned long m_bg_thresh = 0;
 
 		nr_dirty = global_node_page_state(NR_FILE_DIRTY);
-		gdtc->avail = global_dirtyable_memory();
-		gdtc->dirty = nr_dirty + global_node_page_state(NR_WRITEBACK);
 
+		domain_dirty_avail(gdtc, false);
 		domain_dirty_limits(gdtc);
 
 		if (unlikely(strictlimit)) {
@@ -1765,17 +1764,11 @@ static int balance_dirty_pages(struct bdi_writeback *wb,
 		}
 
 		if (mdtc) {
-			unsigned long filepages, headroom, writeback;
-
 			/*
 			 * If @wb belongs to !root memcg, repeat the same
 			 * basic calculations for the memcg domain.
 			 */
-			mem_cgroup_wb_stats(wb, &filepages, &headroom,
-					    &mdtc->dirty, &writeback);
-			mdtc->dirty += writeback;
-			mdtc_calc_avail(mdtc, filepages, headroom);
-
+			domain_dirty_avail(mdtc, false);
 			domain_dirty_limits(mdtc);
 
 			if (unlikely(strictlimit)) {
-- 
2.30.0