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mm/shuffle.h
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// SPDX-License-Identifier: GPL-2.0
// Copyright(c) 2018 Intel Corporation. All rights reserved.
#ifndef _MM_SHUFFLE_H
#define _MM_SHUFFLE_H
#include <linux/jump_label.h>
/*
* SHUFFLE_ENABLE is called from the command line enabling path, or by
* platform-firmware enabling that indicates the presence of a
* direct-mapped memory-side-cache. SHUFFLE_FORCE_DISABLE is called from
* the command line path and overrides any previous or future
* SHUFFLE_ENABLE.
*/
enum mm_shuffle_ctl {
SHUFFLE_ENABLE,
SHUFFLE_FORCE_DISABLE,
};
#define SHUFFLE_ORDER (MAX_ORDER-1)
#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
DECLARE_STATIC_KEY_FALSE(page_alloc_shuffle_key);
extern void page_alloc_shuffle(enum mm_shuffle_ctl ctl);
extern void __shuffle_free_memory(pg_data_t *pgdat);
static inline void shuffle_free_memory(pg_data_t *pgdat)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return;
__shuffle_free_memory(pgdat);
}
extern void __shuffle_zone(struct zone *z);
static inline void shuffle_zone(struct zone *z)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return;
__shuffle_zone(z);
}
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static inline bool is_shuffle_order(int order)
{
if (!static_branch_unlikely(&page_alloc_shuffle_key))
return false;
return order >= SHUFFLE_ORDER;
}
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#else
static inline void shuffle_free_memory(pg_data_t *pgdat)
{
}
static inline void shuffle_zone(struct zone *z)
{
}
static inline void page_alloc_shuffle(enum mm_shuffle_ctl ctl)
{
}
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static inline bool is_shuffle_order(int order)
{
return false;
}
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#endif #endif /* _MM_SHUFFLE_H */ |