2ce5d5b689
PAGE_ALLOC_COSTLY_ORDER allocations can cause vmpressure to incorrectly think that memory pressure is high, when it's really just that the allocation's high order is difficult to satisfy. When this rare scenario occurs, ignore the input to vmpressure to avoid sending out a spurious high-pressure signal. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_VMPRESSURE_H
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#define __LINUX_VMPRESSURE_H
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/workqueue.h>
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#include <linux/gfp.h>
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#include <linux/types.h>
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#include <linux/cgroup.h>
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#include <linux/eventfd.h>
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struct vmpressure {
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unsigned long scanned;
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unsigned long reclaimed;
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unsigned long tree_scanned;
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unsigned long tree_reclaimed;
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unsigned long stall;
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/* The lock is used to keep the scanned/reclaimed above in sync. */
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struct spinlock sr_lock;
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/* The list of vmpressure_event structs. */
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struct list_head events;
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/* Have to grab the lock on events traversal or modifications. */
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struct mutex events_lock;
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struct work_struct work;
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};
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struct mem_cgroup;
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extern int vmpressure_notifier_register(struct notifier_block *nb);
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extern int vmpressure_notifier_unregister(struct notifier_block *nb);
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extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
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unsigned long scanned, unsigned long reclaimed,
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int order);
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extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
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#ifdef CONFIG_MEMCG
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extern void vmpressure_init(struct vmpressure *vmpr);
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extern void vmpressure_cleanup(struct vmpressure *vmpr);
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extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
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extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
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extern int vmpressure_register_event(struct mem_cgroup *memcg,
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struct eventfd_ctx *eventfd,
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const char *args);
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extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
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struct eventfd_ctx *eventfd);
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#else
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static inline struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg)
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{
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return NULL;
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}
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#endif /* CONFIG_MEMCG */
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#endif /* __LINUX_VMPRESSURE_H */
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