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/* SPDX-License-Identifier: GPL-2.0 */
#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>
#include <linux/eventfd.h>
struct vmpressure {
unsigned long scanned;
unsigned long reclaimed;
/* The lock is used to keep the scanned/reclaimed in sync. */
spinlock_t sr_lock;
#ifdef CONFIG_MEMCG_V1
/*
* tree=true accumulators feed the v1 userspace eventfd interface
* (memory.pressure_level). Drained by @work. v2 has no equivalent
* interface, so this state is omitted on CONFIG_MEMCG_V1=n builds.
*/
unsigned long tree_scanned;
unsigned long tree_reclaimed;
/* 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;
#endif
};
enum vmpressure_levels {
VMPRESSURE_LOW = 0,
VMPRESSURE_MEDIUM,
VMPRESSURE_CRITICAL,
VMPRESSURE_NUM_LEVELS,
};
struct mem_cgroup;
#ifdef CONFIG_MEMCG
void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg, bool tree,
unsigned long scanned, unsigned long reclaimed);
extern void vmpressure_init(struct vmpressure *vmpr);
extern void vmpressure_cleanup(struct vmpressure *vmpr);
extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
extern struct mem_cgroup *vmpressure_to_memcg(struct vmpressure *vmpr);
/* Shared with the v1 vmpressure block in mm/memcontrol-v1.c. */
extern const unsigned long vmpressure_win;
extern enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long reclaimed);
#ifdef CONFIG_MEMCG_V1
extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
extern int vmpressure_register_event(struct mem_cgroup *memcg,
struct eventfd_ctx *eventfd,
const char *args);
extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
struct eventfd_ctx *eventfd);
/* v1 hooks called from mm/vmpressure.c; no-ops below when !MEMCG_V1. */
extern void vmpressure_v1_init(struct vmpressure *vmpr);
extern void vmpressure_v1_cleanup(struct vmpressure *vmpr);
extern void vmpressure_v1_account_tree(struct vmpressure *vmpr,
unsigned long scanned,
unsigned long reclaimed);
#else
static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
int prio) {}
static inline void vmpressure_v1_init(struct vmpressure *vmpr) {}
static inline void vmpressure_v1_cleanup(struct vmpressure *vmpr) {}
static inline void vmpressure_v1_account_tree(struct vmpressure *vmpr,
unsigned long scanned,
unsigned long reclaimed) {}
#endif /* CONFIG_MEMCG_V1 */
#else /* !CONFIG_MEMCG */
static inline void vmpressure(gfp_t gfp, int order, struct mem_cgroup *memcg,
bool tree, 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 */
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