Rev 781 | Rev 788 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
759 | palkovsky | 1 | /* |
762 | palkovsky | 2 | * Copyright (C) 2006 Ondrej Palkovsky |
759 | palkovsky | 3 | * All rights reserved. |
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * |
||
9 | * - Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * - Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
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 |
||
15 | * derived from this software without specific prior written permission. |
||
16 | * |
||
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 |
||
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
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 |
||
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 |
||
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | */ |
||
28 | |||
29 | #ifndef __SLAB_H__ |
||
30 | #define __SLAB_H__ |
||
31 | |||
32 | #include <list.h> |
||
33 | #include <synch/spinlock.h> |
||
764 | palkovsky | 34 | #include <arch/atomic.h> |
759 | palkovsky | 35 | |
771 | palkovsky | 36 | /** Minimum size to be allocated by malloc */ |
37 | #define SLAB_MIN_MALLOC_W 3 |
||
38 | |||
39 | /** Maximum size to be allocated by malloc */ |
||
40 | #define SLAB_MAX_MALLOC_W 17 |
||
41 | |||
759 | palkovsky | 42 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
43 | #define SLAB_MAG_SIZE 4 |
||
44 | |||
45 | /** If object size is less, store control structure inside SLAB */ |
||
766 | palkovsky | 46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
759 | palkovsky | 47 | |
762 | palkovsky | 48 | /** Maximum wasted space we allow for cache */ |
771 | palkovsky | 49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2) |
759 | palkovsky | 50 | |
51 | /* slab_reclaim constants */ |
||
52 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
||
53 | * we are in memory stress */ |
||
54 | |||
55 | /* cache_create flags */ |
||
56 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
||
57 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
||
58 | |||
59 | typedef struct { |
||
60 | link_t link; |
||
762 | palkovsky | 61 | count_t busy; /**< Count of full slots in magazine */ |
62 | count_t size; /**< Number of slots in magazine */ |
||
63 | void *objs[0]; /**< Slots in magazine */ |
||
759 | palkovsky | 64 | }slab_magazine_t; |
65 | |||
66 | typedef struct { |
||
67 | char *name; |
||
68 | |||
69 | link_t link; |
||
70 | /* Configuration */ |
||
762 | palkovsky | 71 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
759 | palkovsky | 72 | int (*constructor)(void *obj, int kmflag); |
787 | palkovsky | 73 | int (*destructor)(void *obj); |
762 | palkovsky | 74 | int flags; /**< Flags changing behaviour of cache */ |
759 | palkovsky | 75 | |
76 | /* Computed values */ |
||
762 | palkovsky | 77 | __u8 order; /**< Order of frames to be allocated */ |
78 | int objects; /**< Number of objects that fit in */ |
||
759 | palkovsky | 79 | |
80 | /* Statistics */ |
||
764 | palkovsky | 81 | atomic_t allocated_slabs; |
82 | atomic_t allocated_objs; |
||
767 | palkovsky | 83 | atomic_t cached_objs; |
781 | palkovsky | 84 | atomic_t magazine_counter; /*<< How many magazines in magazines list */ |
759 | palkovsky | 85 | |
86 | /* Slabs */ |
||
762 | palkovsky | 87 | link_t full_slabs; /**< List of full slabs */ |
88 | link_t partial_slabs; /**< List of partial slabs */ |
||
776 | palkovsky | 89 | SPINLOCK_DECLARE(slablock); |
759 | palkovsky | 90 | /* Magazines */ |
762 | palkovsky | 91 | link_t magazines; /**< List o full magazines */ |
776 | palkovsky | 92 | SPINLOCK_DECLARE(maglock); |
762 | palkovsky | 93 | |
94 | /** CPU cache */ |
||
759 | palkovsky | 95 | struct { |
96 | slab_magazine_t *current; |
||
97 | slab_magazine_t *last; |
||
98 | SPINLOCK_DECLARE(lock); |
||
99 | }mag_cache[0]; |
||
100 | }slab_cache_t; |
||
101 | |||
762 | palkovsky | 102 | extern slab_cache_t * slab_cache_create(char *name, |
103 | size_t size, |
||
104 | size_t align, |
||
105 | int (*constructor)(void *obj, int kmflag), |
||
787 | palkovsky | 106 | int (*destructor)(void *obj), |
762 | palkovsky | 107 | int flags); |
108 | extern void slab_cache_destroy(slab_cache_t *cache); |
||
759 | palkovsky | 109 | |
762 | palkovsky | 110 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
111 | extern void slab_free(slab_cache_t *cache, void *obj); |
||
112 | extern count_t slab_reclaim(int flags); |
||
759 | palkovsky | 113 | |
114 | /** Initialize SLAB subsytem */ |
||
762 | palkovsky | 115 | extern void slab_cache_init(void); |
759 | palkovsky | 116 | |
117 | /* KConsole debug */ |
||
762 | palkovsky | 118 | extern void slab_print_list(void); |
759 | palkovsky | 119 | |
771 | palkovsky | 120 | /* Malloc support */ |
121 | extern void * kalloc(unsigned int size, int flags); |
||
122 | extern void kfree(void *obj); |
||
123 | |||
759 | palkovsky | 124 | #endif |