mm: fix vm-scalability regression in cgroup-aware workingset code

[cascardo/linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 192c1bb..97065e1 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -973,11 +973,21 @@ static inline struct mem_cgroup *page_memcg(struct page *page)
 {
        return page->mem_cgroup;
 }
+static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
+{
+       WARN_ON_ONCE(!rcu_read_lock_held());
+       return READ_ONCE(page->mem_cgroup);
+}
 #else
 static inline struct mem_cgroup *page_memcg(struct page *page)
 {
        return NULL;
 }
+static inline struct mem_cgroup *page_memcg_rcu(struct page *page)
+{
+       WARN_ON_ONCE(!rcu_read_lock_held());
+       return NULL;
+}
 #endif
 
 /*
@@ -2284,6 +2294,8 @@ static inline int in_gate_area(struct mm_struct *mm, unsigned long addr)
 }
 #endif /* __HAVE_ARCH_GATE_AREA */
 
+extern bool process_shares_mm(struct task_struct *p, struct mm_struct *mm);
+
 #ifdef CONFIG_SYSCTL
 extern int sysctl_drop_caches;
 int drop_caches_sysctl_handler(struct ctl_table *, int,