We already have a helper lruvec_memcg() to get the memcg from lruvec, we
do not need to do it ourselves in the lruvec_holds_page_lru_lock(). So use
lruvec_memcg() instead. And if mem_cgroup_disabled() returns false, the
page_memcg(page) (the LRU pages) cannot be NULL. So remove the odd logic
of "memcg = page_memcg(page) ? : root_mem_cgroup". And use lruvec_pgdat
to simplify the code. We can have a single definition for this function
that works for !CONFIG_MEMCG, CONFIG_MEMCG + mem_cgroup_disabled() and
CONFIG_MEMCG.
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
---
include/linux/memcontrol.h | 31 +++++++------------------------
1 file changed, 7 insertions(+), 24 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 4f49865c9958..38b8d3fb24ff 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -755,22 +755,6 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page)
return mem_cgroup_lruvec(memcg, pgdat);
}
-static inline bool lruvec_holds_page_lru_lock(struct page *page,
- struct lruvec *lruvec)
-{
- pg_data_t *pgdat = page_pgdat(page);
- const struct mem_cgroup *memcg;
- struct mem_cgroup_per_node *mz;
-
- if (mem_cgroup_disabled())
- return lruvec == &pgdat->__lruvec;
-
- mz = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
- memcg = page_memcg(page) ? : root_mem_cgroup;
-
- return lruvec->pgdat == pgdat && mz->memcg == memcg;
-}
-
struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
@@ -1229,14 +1213,6 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page)
return &pgdat->__lruvec;
}
-static inline bool lruvec_holds_page_lru_lock(struct page *page,
- struct lruvec *lruvec)
-{
- pg_data_t *pgdat = page_pgdat(page);
-
- return lruvec == &pgdat->__lruvec;
-}
-
static inline void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
{
}
@@ -1518,6 +1494,13 @@ static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
spin_unlock_irqrestore(&lruvec->lru_lock, flags);
}
+static inline bool lruvec_holds_page_lru_lock(struct page *page,
+ struct lruvec *lruvec)
+{
+ return lruvec_pgdat(lruvec) == page_pgdat(page) &&
+ lruvec_memcg(lruvec) == page_memcg(page);
+}
+
/* Don't lock again iff page's lruvec locked */
static inline struct lruvec *relock_page_lruvec_irq(struct page *page,
struct lruvec *locked_lruvec)
--
2.11.0
