1 files changed, 47 insertions, 0 deletions

diff --git a/include/linux/vmpressure.h b/include/linux/vmpressure.h
new file mode 100644
index 000000000000..76be077340ea
--- /dev/null
+++ b/include/linux/vmpressure.h
@@ -0,0 +1,47 @@
+#ifndef __LINUX_VMPRESSURE_H
+#define __LINUX_VMPRESSURE_H
+
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/gfp.h>
+#include <linux/types.h>
+#include <linux/cgroup.h>
+
+struct vmpressure {
+        unsigned long scanned;
+        unsigned long reclaimed;
+        /* The lock is used to keep the scanned/reclaimed above in sync. */
+        struct mutex sr_lock;
+
+        /* The list of vmpressure_event structs. */
+        struct list_head events;
+        /* Have to grab the lock on events traversal or modifications. */
+        struct mutex events_lock;
+
+        struct work_struct work;
+};
+
+struct mem_cgroup;
+
+#ifdef CONFIG_MEMCG
+extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
+                       unsigned long scanned, unsigned long reclaimed);
+extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
+
+extern void vmpressure_init(struct vmpressure *vmpr);
+extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
+extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
+extern struct vmpressure *css_to_vmpressure(struct cgroup_subsys_state *css);
+extern int vmpressure_register_event(struct cgroup *cg, struct cftype *cft,
+                                     struct eventfd_ctx *eventfd,
+                                     const char *args);
+extern void vmpressure_unregister_event(struct cgroup *cg, struct cftype *cft,
+                                        struct eventfd_ctx *eventfd);
+#else
+static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
+                              unsigned long scanned, unsigned long reclaimed) {}
+static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
+                                   int prio) {}
+#endif /* CONFIG_MEMCG */
+#endif /* __LINUX_VMPRESSURE_H */