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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
2 | * Copyright (C) 2006 Ondrej Palkovsky |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __SLAB_H__ |
29 | #ifndef __SLAB_H__ |
30 | #define __SLAB_H__ |
30 | #define __SLAB_H__ |
31 | 31 | ||
32 | #include <list.h> |
32 | #include <list.h> |
33 | #include <synch/spinlock.h> |
33 | #include <synch/spinlock.h> |
- | 34 | #include <arch/atomic.h> |
|
34 | 35 | ||
35 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
36 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
36 | #define SLAB_MAG_SIZE 4 |
37 | #define SLAB_MAG_SIZE 4 |
37 | 38 | ||
38 | /** If object size is less, store control structure inside SLAB */ |
39 | /** If object size is less, store control structure inside SLAB */ |
39 | #define SLAB_INSIDE_SIZE (PAGE_SIZE / 6) |
40 | #define SLAB_INSIDE_SIZE (PAGE_SIZE / 6) |
40 | 41 | ||
41 | /** Maximum wasted space we allow for cache */ |
42 | /** Maximum wasted space we allow for cache */ |
42 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) / 4) |
43 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) / 4) |
43 | 44 | ||
44 | /* slab_reclaim constants */ |
45 | /* slab_reclaim constants */ |
45 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
46 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
46 | * we are in memory stress */ |
47 | * we are in memory stress */ |
47 | 48 | ||
48 | /* cache_create flags */ |
49 | /* cache_create flags */ |
49 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
50 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
50 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
51 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
51 | 52 | ||
52 | typedef struct { |
53 | typedef struct { |
53 | link_t link; |
54 | link_t link; |
54 | count_t busy; /**< Count of full slots in magazine */ |
55 | count_t busy; /**< Count of full slots in magazine */ |
55 | count_t size; /**< Number of slots in magazine */ |
56 | count_t size; /**< Number of slots in magazine */ |
56 | void *objs[0]; /**< Slots in magazine */ |
57 | void *objs[0]; /**< Slots in magazine */ |
57 | }slab_magazine_t; |
58 | }slab_magazine_t; |
58 | 59 | ||
59 | typedef struct { |
60 | typedef struct { |
60 | char *name; |
61 | char *name; |
61 | 62 | ||
62 | SPINLOCK_DECLARE(lock); |
63 | SPINLOCK_DECLARE(lock); |
63 | link_t link; |
64 | link_t link; |
64 | /* Configuration */ |
65 | /* Configuration */ |
65 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
66 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
66 | int (*constructor)(void *obj, int kmflag); |
67 | int (*constructor)(void *obj, int kmflag); |
67 | void (*destructor)(void *obj); |
68 | void (*destructor)(void *obj); |
68 | int flags; /**< Flags changing behaviour of cache */ |
69 | int flags; /**< Flags changing behaviour of cache */ |
69 | 70 | ||
70 | /* Computed values */ |
71 | /* Computed values */ |
71 | __u8 order; /**< Order of frames to be allocated */ |
72 | __u8 order; /**< Order of frames to be allocated */ |
72 | int objects; /**< Number of objects that fit in */ |
73 | int objects; /**< Number of objects that fit in */ |
73 | 74 | ||
74 | /* Statistics */ |
75 | /* Statistics */ |
- | 76 | atomic_t allocated_slabs; |
|
- | 77 | atomic_t allocated_objs; |
|
75 | 78 | ||
76 | /* Slabs */ |
79 | /* Slabs */ |
77 | link_t full_slabs; /**< List of full slabs */ |
80 | link_t full_slabs; /**< List of full slabs */ |
78 | link_t partial_slabs; /**< List of partial slabs */ |
81 | link_t partial_slabs; /**< List of partial slabs */ |
79 | /* Magazines */ |
82 | /* Magazines */ |
80 | link_t magazines; /**< List o full magazines */ |
83 | link_t magazines; /**< List o full magazines */ |
81 | 84 | ||
82 | /** CPU cache */ |
85 | /** CPU cache */ |
83 | struct { |
86 | struct { |
84 | slab_magazine_t *current; |
87 | slab_magazine_t *current; |
85 | slab_magazine_t *last; |
88 | slab_magazine_t *last; |
86 | SPINLOCK_DECLARE(lock); |
89 | SPINLOCK_DECLARE(lock); |
87 | }mag_cache[0]; |
90 | }mag_cache[0]; |
88 | }slab_cache_t; |
91 | }slab_cache_t; |
89 | 92 | ||
90 | extern slab_cache_t * slab_cache_create(char *name, |
93 | extern slab_cache_t * slab_cache_create(char *name, |
91 | size_t size, |
94 | size_t size, |
92 | size_t align, |
95 | size_t align, |
93 | int (*constructor)(void *obj, int kmflag), |
96 | int (*constructor)(void *obj, int kmflag), |
94 | void (*destructor)(void *obj), |
97 | void (*destructor)(void *obj), |
95 | int flags); |
98 | int flags); |
96 | extern void slab_cache_destroy(slab_cache_t *cache); |
99 | extern void slab_cache_destroy(slab_cache_t *cache); |
97 | 100 | ||
98 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
101 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
99 | extern void slab_free(slab_cache_t *cache, void *obj); |
102 | extern void slab_free(slab_cache_t *cache, void *obj); |
100 | extern count_t slab_reclaim(int flags); |
103 | extern count_t slab_reclaim(int flags); |
101 | 104 | ||
102 | /** Initialize SLAB subsytem */ |
105 | /** Initialize SLAB subsytem */ |
103 | extern void slab_cache_init(void); |
106 | extern void slab_cache_init(void); |
104 | 107 | ||
105 | /* KConsole debug */ |
108 | /* KConsole debug */ |
106 | extern void slab_print_list(void); |
109 | extern void slab_print_list(void); |
107 | 110 | ||
108 | #endif |
111 | #endif |
109 | 112 |