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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_QUICKLIST_H
3 #define LINUX_QUICKLIST_H
5 * Fast allocations and disposal of pages. Pages must be in the condition
6 * as needed after allocation when they are freed. Per cpu lists of pages
7 * are kept that only contain node local pages.
9 * (C) 2007, SGI. Christoph Lameter <cl@linux.com>
11 #include <linux/kernel.h>
12 #include <linux/gfp.h>
13 #include <linux/percpu.h>
15 #ifdef CONFIG_QUICKLIST
22 DECLARE_PER_CPU(struct quicklist
, quicklist
)[CONFIG_NR_QUICK
];
25 * The two key functions quicklist_alloc and quicklist_free are inline so
26 * that they may be custom compiled for the platform.
27 * Specifying a NULL ctor can remove constructor support. Specifying
28 * a constant quicklist allows the determination of the exact address
29 * in the per cpu area.
31 * The fast patch in quicklist_alloc touched only a per cpu cacheline and
32 * the first cacheline of the page itself. There is minmal overhead involved.
34 static inline void *quicklist_alloc(int nr
, gfp_t flags
, void (*ctor
)(void *))
39 q
=&get_cpu_var(quicklist
)[nr
];
46 put_cpu_var(quicklist
);
50 p
= (void *)__get_free_page(flags
| __GFP_ZERO
);
56 static inline void __quicklist_free(int nr
, void (*dtor
)(void *), void *p
,
61 q
= &get_cpu_var(quicklist
)[nr
];
62 *(void **)p
= q
->page
;
65 put_cpu_var(quicklist
);
68 static inline void quicklist_free(int nr
, void (*dtor
)(void *), void *pp
)
70 __quicklist_free(nr
, dtor
, pp
, virt_to_page(pp
));
73 static inline void quicklist_free_page(int nr
, void (*dtor
)(void *),
76 __quicklist_free(nr
, dtor
, page_address(page
), page
);
79 void quicklist_trim(int nr
, void (*dtor
)(void *),
80 unsigned long min_pages
, unsigned long max_free
);
82 unsigned long quicklist_total_size(void);
86 static inline unsigned long quicklist_total_size(void)
93 #endif /* LINUX_QUICKLIST_H */