[PATCH] writeback: memcg: simplify cgroup_writeback_by_id

[Shakeel Butt]

Currently cgroup_writeback_by_id calls mem_cgroup_wb_stats() to get
dirty pages for a memcg. However mem_cgroup_wb_stats() does a lot more
than just get the number of dirty pages. Just directly get the number of
dirty pages instead of calling mem_cgroup_wb_stats(). Also
cgroup_writeback_by_id() is only called for best-effort dirty flushing,
so remove the unused 'nr' parameter and no need to explicitly flush
memcg stats.

Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
---
 fs/fs-writeback.c          | 20 +++++++++-----------
 include/linux/memcontrol.h | 15 +++++++++++++++
 include/linux/writeback.h  |  2 +-
 mm/memcontrol.c            | 13 +------------
 4 files changed, 26 insertions(+), 24 deletions(-)

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 867984e778c3..35894a2dba75 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1039,20 +1039,20 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi,
  * cgroup_writeback_by_id - initiate cgroup writeback from bdi and memcg IDs
  * @bdi_id: target bdi id
  * @memcg_id: target memcg css id
- * @nr: number of pages to write, 0 for best-effort dirty flushing
  * @reason: reason why some writeback work initiated
  * @done: target wb_completion
  *
  * Initiate flush of the bdi_writeback identified by @bdi_id and @memcg_id
  * with the specified parameters.
  */
-int cgroup_writeback_by_id(u64 bdi_id, int memcg_id, unsigned long nr,
+int cgroup_writeback_by_id(u64 bdi_id, int memcg_id,
 			   enum wb_reason reason, struct wb_completion *done)
 {
 	struct backing_dev_info *bdi;
 	struct cgroup_subsys_state *memcg_css;
 	struct bdi_writeback *wb;
 	struct wb_writeback_work *work;
+	unsigned long dirty;
 	int ret;
 
 	/* lookup bdi and memcg */
@@ -1081,24 +1081,22 @@ int cgroup_writeback_by_id(u64 bdi_id, int memcg_id, unsigned long nr,
 	}
 
 	/*
-	 * If @nr is zero, the caller is attempting to write out most of
+	 * The caller is attempting to write out most of
 	 * the currently dirty pages.  Let's take the current dirty page
 	 * count and inflate it by 25% which should be large enough to
 	 * flush out most dirty pages while avoiding getting livelocked by
 	 * concurrent dirtiers.
+	 *
+	 * BTW the memcg stats are flushed periodically and this is best-effort
+	 * estimation, so some potential error is ok.
 	 */
-	if (!nr) {
-		unsigned long filepages, headroom, dirty, writeback;
-
-		mem_cgroup_wb_stats(wb, &filepages, &headroom, &dirty,
-				      &writeback);
-		nr = dirty * 10 / 8;
-	}
+	dirty = memcg_page_state(mem_cgroup_from_css(memcg_css), NR_FILE_DIRTY);
+	dirty = dirty * 10 / 8;
 
 	/* issue the writeback work */
 	work = kzalloc(sizeof(*work), GFP_NOWAIT | __GFP_NOWARN);
 	if (work) {
-		work->nr_pages = nr;
+		work->nr_pages = dirty;
 		work->sync_mode = WB_SYNC_NONE;
 		work->range_cyclic = 1;
 		work->reason = reason;
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index b4c6b613e162..7028d8e4a3d7 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -989,6 +989,16 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
 	local_irq_restore(flags);
 }
 
+static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
+{
+	long x = READ_ONCE(memcg->vmstats.state[idx]);
+#ifdef CONFIG_SMP
+	if (x < 0)
+		x = 0;
+#endif
+	return x;
+}
+
 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
 					      enum node_stat_item idx)
 {
@@ -1444,6 +1454,11 @@ static inline void mod_memcg_state(struct mem_cgroup *memcg,
 {
 }
 
+static inline unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
+{
+	return 0;
+}
+
 static inline unsigned long lruvec_page_state(struct lruvec *lruvec,
 					      enum node_stat_item idx)
 {
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 1f34ddf284dc..109e0dcd1d21 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -218,7 +218,7 @@ void wbc_attach_and_unlock_inode(struct writeback_control *wbc,
 void wbc_detach_inode(struct writeback_control *wbc);
 void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
 			      size_t bytes);
-int cgroup_writeback_by_id(u64 bdi_id, int memcg_id, unsigned long nr_pages,
+int cgroup_writeback_by_id(u64 bdi_id, int memcg_id,
 			   enum wb_reason reason, struct wb_completion *done);
 void cgroup_writeback_umount(void);
 bool cleanup_offline_cgwb(struct bdi_writeback *wb);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 35bb5f8f9ea8..6580c2381a3e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -631,17 +631,6 @@ void __mod_memcg_state(struct mem_cgroup *memcg, int idx, int val)
 	cgroup_rstat_updated(memcg->css.cgroup, smp_processor_id());
 }
 
-/* idx can be of type enum memcg_stat_item or node_stat_item. */
-static unsigned long memcg_page_state(struct mem_cgroup *memcg, int idx)
-{
-	long x = READ_ONCE(memcg->vmstats.state[idx]);
-#ifdef CONFIG_SMP
-	if (x < 0)
-		x = 0;
-#endif
-	return x;
-}
-
 /* idx can be of type enum memcg_stat_item or node_stat_item. */
 static unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx)
 {
@@ -4609,7 +4598,7 @@ void mem_cgroup_flush_foreign(struct bdi_writeback *wb)
 		    atomic_read(&frn->done.cnt) == 1) {
 			frn->at = 0;
 			trace_flush_foreign(wb, frn->bdi_id, frn->memcg_id);
-			cgroup_writeback_by_id(frn->bdi_id, frn->memcg_id, 0,
+			cgroup_writeback_by_id(frn->bdi_id, frn->memcg_id,
 					       WB_REASON_FOREIGN_FLUSH,
 					       &frn->done);
 		}
-- 
2.32.0.432.gabb21c7263-goog