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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [quicklist.h] - Blame information for rev 82

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#ifndef LINUX_QUICKLIST_H
#define LINUX_QUICKLIST_H
/*
 * Fast allocations and disposal of pages. Pages must be in the condition
 * as needed after allocation when they are freed. Per cpu lists of pages
 * are kept that only contain node local pages.
 *
 * (C) 2007, SGI. Christoph Lameter <clameter@sgi.com>
 */
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
 
#ifdef CONFIG_QUICKLIST
 
struct quicklist {
        void *page;
        int nr_pages;
};
 
DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
 
/*
 * The two key functions quicklist_alloc and quicklist_free are inline so
 * that they may be custom compiled for the platform.
 * Specifying a NULL ctor can remove constructor support. Specifying
 * a constant quicklist allows the determination of the exact address
 * in the per cpu area.
 *
 * The fast patch in quicklist_alloc touched only a per cpu cacheline and
 * the first cacheline of the page itself. There is minmal overhead involved.
 */
static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
{
        struct quicklist *q;
        void **p = NULL;
 
        q =&get_cpu_var(quicklist)[nr];
        p = q->page;
        if (likely(p)) {
                q->page = p[0];
                p[0] = NULL;
                q->nr_pages--;
        }
        put_cpu_var(quicklist);
        if (likely(p))
                return p;
 
        p = (void *)__get_free_page(flags | __GFP_ZERO);
        if (ctor && p)
                ctor(p);
        return p;
}
 
static inline void __quicklist_free(int nr, void (*dtor)(void *), void *p,
        struct page *page)
{
        struct quicklist *q;
 
        q = &get_cpu_var(quicklist)[nr];
        *(void **)p = q->page;
        q->page = p;
        q->nr_pages++;
        put_cpu_var(quicklist);
}
 
static inline void quicklist_free(int nr, void (*dtor)(void *), void *pp)
{
        __quicklist_free(nr, dtor, pp, virt_to_page(pp));
}
 
static inline void quicklist_free_page(int nr, void (*dtor)(void *),
                                                        struct page *page)
{
        __quicklist_free(nr, dtor, page_address(page), page);
}
 
void quicklist_trim(int nr, void (*dtor)(void *),
        unsigned long min_pages, unsigned long max_free);
 
unsigned long quicklist_total_size(void);
 
#endif
 
#endif /* LINUX_QUICKLIST_H */
 

Line No.	Rev	Author	Line
1	62	marcus.erl	`#ifndef LINUX_QUICKLIST_H`
2			`#define LINUX_QUICKLIST_H`
3			`/*`
4			`* Fast allocations and disposal of pages. Pages must be in the condition`
5			`* as needed after allocation when they are freed. Per cpu lists of pages`
6			`* are kept that only contain node local pages.`
7			`*`
8			`* (C) 2007, SGI. Christoph Lameter <clameter@sgi.com>`
9			`*/`
10			`#include <linux/kernel.h>`
11			`#include <linux/gfp.h>`
12			`#include <linux/percpu.h>`
13
14			`#ifdef CONFIG_QUICKLIST`
15
16			`struct quicklist {`
17			`void *page;`
18			`int nr_pages;`
19			`};`
20
21			`DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];`
22
23			`/*`
24			`* The two key functions quicklist_alloc and quicklist_free are inline so`
25			`* that they may be custom compiled for the platform.`
26			`* Specifying a NULL ctor can remove constructor support. Specifying`
27			`* a constant quicklist allows the determination of the exact address`
28			`* in the per cpu area.`
29			`*`
30			`* The fast patch in quicklist_alloc touched only a per cpu cacheline and`
31			`* the first cacheline of the page itself. There is minmal overhead involved.`
32			`*/`
33			`static inline void quicklist_alloc(int nr, gfp_t flags, void (ctor)(void *))`
34			`{`
35			`struct quicklist *q;`
36			`void **p = NULL;`
37
38			`q =&get_cpu_var(quicklist)[nr];`
39			`p = q->page;`
40			`if (likely(p)) {`
41			`q->page = p[0];`
42			`p[0] = NULL;`
43			`q->nr_pages--;`
44			`}`
45			`put_cpu_var(quicklist);`
46			`if (likely(p))`
47			`return p;`
48
49			`p = (void *)__get_free_page(flags \| __GFP_ZERO);`
50			`if (ctor && p)`
51			`ctor(p);`
52			`return p;`
53			`}`
54
55			`static inline void __quicklist_free(int nr, void (dtor)(void ), void *p,`
56			`struct page *page)`
57			`{`
58			`struct quicklist *q;`
59
60			`q = &get_cpu_var(quicklist)[nr];`
61			`(void *)p = q->page;`
62			`q->page = p;`
63			`q->nr_pages++;`
64			`put_cpu_var(quicklist);`
65			`}`
66
67			`static inline void quicklist_free(int nr, void (dtor)(void ), void *pp)`
68			`{`
69			`__quicklist_free(nr, dtor, pp, virt_to_page(pp));`
70			`}`
71
72			`static inline void quicklist_free_page(int nr, void (dtor)(void ),`
73			`struct page *page)`
74			`{`
75			`__quicklist_free(nr, dtor, page_address(page), page);`
76			`}`
77
78			`void quicklist_trim(int nr, void (dtor)(void ),`
79			`unsigned long min_pages, unsigned long max_free);`
80
81			`unsigned long quicklist_total_size(void);`
82
83			`#endif`
84
85			`#endif /* LINUX_QUICKLIST_H */`
86

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[/] [test_project/] [trunk/] [linux_sd_driver/] [include/] [linux/] [quicklist.h] - Blame information for rev 82