1 |
< |
/* Copyright (c) 1990 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1992 Regents of the University of California */ |
2 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
7 |
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/* |
8 |
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* Fast malloc for memory hogs and VM environments. |
9 |
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* Performs a minimum of searching through free lists. |
10 |
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* bmalloc() doesn't keep track of free lists -- it's basically |
11 |
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* just a buffered call to sbrk(). |
12 |
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* bfree() puts memory from any source into malloc() free lists. |
10 |
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* malloc(), realloc() and free() use buckets |
11 |
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* containing blocks in powers of two, similar to CIT routines. |
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* bfree() puts memory from any source into malloc free lists. |
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* bmalloc() doesn't keep track of free lists -- it's usually |
14 |
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* just a buffered call to sbrk(2). However, bmalloc will |
15 |
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* call mscrounge() if sbrk fails. |
16 |
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* mscrounge() returns whatever free memory it can find to satisfy the |
17 |
+ |
* request along with the number of bytes (modified). |
18 |
+ |
* mcompact() takes the same arguments as mscrounge() (and is in fact |
19 |
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* called by mscrounge() under dire circumstances), but it uses |
20 |
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* memory compaction to return a larger block. (MCOMP) |
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* |
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* Greg Ward Lawrence Berkeley Laboratory |
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*/ |
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|
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#include <errno.h> |
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|
27 |
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extern int errno; |
28 |
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|
29 |
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#ifdef MSTATS |
30 |
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#include <stdio.h> |
31 |
+ |
static unsigned b_nsbrked = 0; |
32 |
+ |
static unsigned b_nalloced = 0; |
33 |
+ |
static unsigned b_nfreed = 0; |
34 |
+ |
static unsigned b_nscrounged = 0; |
35 |
+ |
static unsigned b_ncompacted = 0; |
36 |
+ |
static unsigned m_nalloced = 0; |
37 |
+ |
static unsigned m_nfreed = 0; |
38 |
+ |
static unsigned m_nwasted = 0; |
39 |
+ |
#else |
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#define NULL 0 |
41 |
+ |
#endif |
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|
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#ifndef ALIGN |
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#define ALIGN int /* align type */ |
45 |
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#endif |
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#define BYTES_WORD sizeof(ALIGN) |
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|
48 |
< |
#ifdef NOVMEM |
49 |
< |
#define getpagesize() BYTES_WORD |
48 |
> |
#ifndef MAXINCR |
49 |
> |
#define MAXINCR (1<<16) /* largest sbrk(2) increment */ |
50 |
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#endif |
29 |
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|
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/* malloc free lists */ |
52 |
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typedef union m_head { |
53 |
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union m_head *next; |
54 |
< |
int bucket; |
54 |
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struct { |
55 |
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short magic; |
56 |
> |
short bucket; |
57 |
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} a; |
58 |
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ALIGN dummy; |
59 |
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} M_HEAD; |
60 |
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|
61 |
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#define MAGIC 0x1a2 /* magic number for allocated memory */ |
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|
63 |
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#define FIRSTBUCKET 3 |
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#define NBUCKETS 30 |
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|
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static M_HEAD *free_list[NBUCKETS]; |
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|
68 |
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static ALIGN dummy_mem; |
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|
70 |
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static char *memlim[2]; |
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|
72 |
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#define DUMMYLOC ((char *)&dummy_mem) |
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|
74 |
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#define BADPTR(p) ((p) < memlim[0] | (p) >= memlim[1]) |
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|
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#ifdef MCOMP /* memory compaction routines */ |
77 |
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static char seedtab[1024]; /* seed for compaction table */ |
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|
79 |
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static struct mblk { |
80 |
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char *ptr; /* pointer to memory block */ |
81 |
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unsigned siz; /* size of memory block */ |
82 |
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} cptab = {seedtab, sizeof(seedtab)}; |
83 |
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|
84 |
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#define mtab(mb) ((struct mblk *)(mb)->ptr) |
85 |
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#define mtablen(mb) ((mb)->siz/sizeof(struct mblk)) |
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|
87 |
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|
88 |
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static int |
89 |
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mbcmp(m1, m2) /* compare memory block locations */ |
90 |
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register struct mblk *m1, *m2; |
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{ |
92 |
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/* put empty blocks at end */ |
93 |
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if (m1->siz == 0) |
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return(m2->siz == 0 ? 0 : 1); |
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if (m2->siz == 0) |
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return(-1); |
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/* otherwise, ascending order */ |
98 |
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return(m1->ptr - m2->ptr); |
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} |
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|
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|
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int |
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compactfree() /* compact free lists (moving to table) */ |
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{ |
105 |
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register struct mblk *tp; |
106 |
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register int bucket; |
107 |
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unsigned n, bsiz, ncomp; |
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/* fill table from free lists */ |
109 |
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tp = mtab(&cptab); n = mtablen(&cptab); |
110 |
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bucket = NBUCKETS-1; bsiz = 1<<(NBUCKETS-1); |
111 |
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ncomp = 0; |
112 |
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for ( ; ; ) { |
113 |
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while (tp->siz) { /* find empty slot */ |
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if (--n == 0) |
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goto loopexit; |
116 |
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tp++; |
117 |
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} |
118 |
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while (free_list[bucket] == NULL) { /* find block */ |
119 |
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if (--bucket < FIRSTBUCKET) |
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goto loopexit; |
121 |
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bsiz >>= 1; |
122 |
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} |
123 |
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tp->ptr = (char *)free_list[bucket]; |
124 |
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ncomp += (tp->siz = bsiz + sizeof(M_HEAD)); |
125 |
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free_list[bucket] = free_list[bucket]->next; |
126 |
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} |
127 |
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loopexit: |
128 |
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if (ncomp == 0) |
129 |
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return(0); /* nothing new to compact */ |
130 |
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#ifdef MSTATS |
131 |
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b_ncompacted += ncomp; |
132 |
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#endif |
133 |
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tp = mtab(&cptab); n = mtablen(&cptab); /* sort table */ |
134 |
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qsort((char *)tp, n, sizeof(struct mblk), mbcmp); |
135 |
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ncomp = 0; /* collect blocks */ |
136 |
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while (--n && tp[1].siz) { |
137 |
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if (tp[0].ptr + tp[0].siz == tp[1].ptr) { |
138 |
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tp[1].ptr = tp[0].ptr; |
139 |
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tp[1].siz += tp[0].siz; |
140 |
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ncomp += tp[0].siz; |
141 |
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tp[0].siz = 0; |
142 |
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} |
143 |
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tp++; |
144 |
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} |
145 |
+ |
return(ncomp); |
146 |
+ |
} |
147 |
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|
148 |
+ |
|
149 |
|
char * |
150 |
+ |
mcompact(np) /* compact free lists to satisfy request */ |
151 |
+ |
unsigned *np; |
152 |
+ |
{ |
153 |
+ |
struct mblk *tab; |
154 |
+ |
unsigned tablen; |
155 |
+ |
register struct mblk *bp, *big; |
156 |
+ |
|
157 |
+ |
for ( ; ; ) { |
158 |
+ |
/* compact free lists */ |
159 |
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compactfree(); |
160 |
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/* find largest block */ |
161 |
+ |
tab = mtab(&cptab); tablen = mtablen(&cptab); |
162 |
+ |
big = tab; |
163 |
+ |
bp = tab + tablen; |
164 |
+ |
while (--bp > tab) |
165 |
+ |
if (bp->siz > big->siz) |
166 |
+ |
big = bp; |
167 |
+ |
if (big->siz >= *np) { /* big enough? */ |
168 |
+ |
*np = big->siz; |
169 |
+ |
big->siz = 0; /* remove from table */ |
170 |
+ |
return(big->ptr); /* return it */ |
171 |
+ |
} |
172 |
+ |
if (mtablen(big) < tablen+1) { |
173 |
+ |
*np = 0; /* cannot grow table */ |
174 |
+ |
return(NULL); /* report failure */ |
175 |
+ |
} |
176 |
+ |
/* enlarge table, free old one */ |
177 |
+ |
mtab(big)[0].ptr = cptab.ptr; |
178 |
+ |
mtab(big)[0].siz = cptab.siz; |
179 |
+ |
cptab.ptr = big->ptr; |
180 |
+ |
cptab.siz = big->siz; |
181 |
+ |
big->siz = 0; /* clear and copy */ |
182 |
+ |
#ifdef BSD |
183 |
+ |
bcopy((char *)tab, (char *)(mtab(&cptab)+1), |
184 |
+ |
tablen*sizeof(struct mblk)); |
185 |
+ |
bzero((char *)(mtab(&cptab)+tablen+1), |
186 |
+ |
(mtablen(&cptab)-tablen-1)*sizeof(struct mblk)); |
187 |
+ |
#else |
188 |
+ |
(void)memcpy((char *)(mtab(&cptab)+1), (char *)tab, |
189 |
+ |
tablen*sizeof(struct mblk)); |
190 |
+ |
memset((char *)(mtab(&cptab)+tablen+1), 0, |
191 |
+ |
(mtablen(&cptab)-tablen-1)*sizeof(struct mblk)); |
192 |
+ |
#endif |
193 |
+ |
} /* next round */ |
194 |
+ |
} |
195 |
+ |
#endif /* MCOMP */ |
196 |
+ |
|
197 |
+ |
|
198 |
+ |
char * |
199 |
+ |
mscrounge(np) /* search free lists to satisfy request */ |
200 |
+ |
register unsigned *np; |
201 |
+ |
{ |
202 |
+ |
char *p; |
203 |
+ |
register int bucket; |
204 |
+ |
register unsigned bsiz; |
205 |
+ |
|
206 |
+ |
for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
207 |
+ |
bucket < NBUCKETS; bucket++, bsiz <<= 1) |
208 |
+ |
if (free_list[bucket] != NULL && bsiz+sizeof(M_HEAD) >= *np) { |
209 |
+ |
*np = bsiz+sizeof(M_HEAD); |
210 |
+ |
p = (char *)free_list[bucket]; |
211 |
+ |
free_list[bucket] = free_list[bucket]->next; |
212 |
+ |
#ifdef MSTATS |
213 |
+ |
b_nscrounged += *np; |
214 |
+ |
#endif |
215 |
+ |
return(p); |
216 |
+ |
} |
217 |
+ |
#ifdef MCOMP |
218 |
+ |
return(mcompact(np)); /* try compaction */ |
219 |
+ |
#else |
220 |
+ |
*np = 0; |
221 |
+ |
return(NULL); |
222 |
+ |
#endif |
223 |
+ |
} |
224 |
+ |
|
225 |
+ |
|
226 |
+ |
char * |
227 |
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bmalloc(n) /* allocate a block of n bytes, sans header */ |
228 |
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register unsigned n; |
229 |
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{ |
230 |
|
extern char *sbrk(); |
231 |
< |
static int pagesz = 0; |
232 |
< |
static int amnt; |
231 |
> |
static unsigned pagesz = 0; |
232 |
> |
static unsigned amnt; |
233 |
|
static char *bpos; |
234 |
< |
static int nrem; |
234 |
> |
static unsigned nrem; |
235 |
> |
unsigned thisamnt; |
236 |
|
register char *p; |
237 |
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|
238 |
|
if (pagesz == 0) { /* initialize */ |
239 |
< |
amnt = pagesz = getpagesize(); |
239 |
> |
pagesz = amnt = getpagesize(); |
240 |
|
nrem = (int)sbrk(0); /* page align break */ |
241 |
|
nrem = pagesz - (nrem&(pagesz-1)); |
242 |
< |
bpos = sbrk(nrem); /* word aligned! */ |
242 |
> |
bpos = sbrk(nrem); |
243 |
|
if ((int)bpos == -1) |
244 |
|
return(NULL); |
245 |
+ |
#ifdef MSTATS |
246 |
+ |
b_nsbrked += nrem; |
247 |
+ |
#endif |
248 |
+ |
bpos += nrem & (BYTES_WORD-1); /* align pointer */ |
249 |
+ |
nrem &= ~(BYTES_WORD-1); |
250 |
+ |
memlim[0] = bpos; |
251 |
+ |
memlim[1] = bpos + nrem; |
252 |
|
} |
253 |
|
|
254 |
|
n = (n+(BYTES_WORD-1))&~(BYTES_WORD-1); /* word align rqst. */ |
255 |
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|
256 |
|
if (n > nrem) { /* need more core */ |
257 |
< |
if (n > amnt) /* increase amount */ |
258 |
< |
amnt = (n+(pagesz-1))&~(pagesz-1); |
259 |
< |
p = sbrk(amnt); |
260 |
< |
if ((int)p == -1) |
70 |
< |
return(NULL); |
71 |
< |
if (p != bpos+nrem) { /* someone called sbrk()! */ |
72 |
< |
bfree(bpos, nrem); |
73 |
< |
bpos = p; |
74 |
< |
nrem = amnt; |
257 |
> |
if (n > amnt) { /* big chunk */ |
258 |
> |
thisamnt = (n+(pagesz-1))&~(pagesz-1); |
259 |
> |
if (thisamnt <= MAXINCR) /* increase amnt */ |
260 |
> |
amnt = thisamnt; |
261 |
|
} else |
262 |
< |
nrem += amnt; |
262 |
> |
thisamnt = amnt; |
263 |
> |
p = sbrk(thisamnt); |
264 |
> |
if ((int)p == -1) { /* uh-oh, ENOMEM */ |
265 |
> |
thisamnt = n; /* search free lists */ |
266 |
> |
p = mscrounge(&thisamnt); |
267 |
> |
if (p == NULL) /* we're really out */ |
268 |
> |
return(NULL); |
269 |
> |
} |
270 |
> |
#ifdef MSTATS |
271 |
> |
else b_nsbrked += thisamnt; |
272 |
> |
#endif |
273 |
> |
if (p != bpos+nrem) { /* not an increment */ |
274 |
> |
bfree(bpos, nrem); /* free what we have */ |
275 |
> |
bpos = p; |
276 |
> |
nrem = thisamnt; |
277 |
> |
} else /* otherwise tack on */ |
278 |
> |
nrem += thisamnt; |
279 |
> |
if (bpos < memlim[0]) |
280 |
> |
memlim[0] = bpos; |
281 |
> |
if (bpos + nrem > memlim[1]) |
282 |
> |
memlim[1] = bpos + nrem; |
283 |
|
} |
284 |
|
p = bpos; |
285 |
|
bpos += n; /* advance */ |
286 |
|
nrem -= n; |
287 |
+ |
#ifdef MSTATS |
288 |
+ |
b_nalloced += n; |
289 |
+ |
#endif |
290 |
|
return(p); |
291 |
|
} |
292 |
|
|
293 |
|
|
294 |
|
bfree(p, n) /* free n bytes of random memory */ |
295 |
< |
char *p; |
296 |
< |
unsigned n; |
295 |
> |
register char *p; |
296 |
> |
register unsigned n; |
297 |
|
{ |
89 |
– |
register M_HEAD *mp; |
298 |
|
register int bucket; |
299 |
|
register unsigned bsiz; |
300 |
< |
/* find largest bucket */ |
301 |
< |
bucket = 0; |
302 |
< |
for (bsiz = 1; bsiz+sizeof(M_HEAD) <= n; bsiz <<= 1) |
303 |
< |
bucket++; |
304 |
< |
mp = (M_HEAD *)p; |
305 |
< |
while (bucket > FIRSTBUCKET) { |
306 |
< |
bsiz >>= 1; |
307 |
< |
bucket--; |
308 |
< |
if (n < bsiz+sizeof(M_HEAD)) /* nothing for this bucket */ |
309 |
< |
continue; |
310 |
< |
mp->next = free_list[bucket]; |
103 |
< |
free_list[bucket] = mp; |
104 |
< |
(char *)mp += bsiz+sizeof(M_HEAD); |
105 |
< |
n -= bsiz+sizeof(M_HEAD); |
300 |
> |
|
301 |
> |
if (n < 1<<FIRSTBUCKET) |
302 |
> |
return; |
303 |
> |
#ifdef MSTATS |
304 |
> |
b_nfreed += n; |
305 |
> |
#endif |
306 |
> |
/* align pointer */ |
307 |
> |
bsiz = BYTES_WORD - ((unsigned)p&(BYTES_WORD-1)); |
308 |
> |
if (bsiz < BYTES_WORD) { |
309 |
> |
p += bsiz; |
310 |
> |
n -= bsiz; |
311 |
|
} |
312 |
+ |
if (p < memlim[0]) |
313 |
+ |
memlim[0] = p; |
314 |
+ |
if (p + n > memlim[1]) |
315 |
+ |
memlim[1] = p + n; |
316 |
+ |
/* fill big buckets first */ |
317 |
+ |
for (bucket = NBUCKETS-1, bsiz = 1<<(NBUCKETS-1); |
318 |
+ |
bucket >= FIRSTBUCKET; bucket--, bsiz >>= 1) |
319 |
+ |
if (n >= bsiz+sizeof(M_HEAD)) { |
320 |
+ |
((M_HEAD *)p)->next = free_list[bucket]; |
321 |
+ |
free_list[bucket] = (M_HEAD *)p; |
322 |
+ |
p += bsiz+sizeof(M_HEAD); |
323 |
+ |
n -= bsiz+sizeof(M_HEAD); |
324 |
+ |
} |
325 |
|
} |
326 |
|
|
327 |
|
|
332 |
|
register M_HEAD *mp; |
333 |
|
register int bucket; |
334 |
|
register unsigned bsiz; |
335 |
< |
|
336 |
< |
bucket = FIRSTBUCKET; |
337 |
< |
for (bsiz = 1<<FIRSTBUCKET; bsiz < n; bsiz <<= 1) |
338 |
< |
bucket++; |
339 |
< |
if (free_list[bucket] == NULL) { |
335 |
> |
/* don't return NULL on 0 request */ |
336 |
> |
if (n == 0) |
337 |
> |
return(DUMMYLOC); |
338 |
> |
/* find first bucket that fits */ |
339 |
> |
for (bucket = FIRSTBUCKET, bsiz = 1<<FIRSTBUCKET; |
340 |
> |
bucket < NBUCKETS; bucket++, bsiz <<= 1) |
341 |
> |
if (bsiz >= n) |
342 |
> |
break; |
343 |
> |
if (bucket >= NBUCKETS) { |
344 |
> |
errno = EINVAL; |
345 |
> |
return(NULL); |
346 |
> |
} |
347 |
> |
if (free_list[bucket] == NULL) { /* need more core */ |
348 |
|
mp = (M_HEAD *)bmalloc(bsiz+sizeof(M_HEAD)); |
349 |
|
if (mp == NULL) |
350 |
|
return(NULL); |
351 |
< |
} else { |
351 |
> |
} else { /* got it */ |
352 |
|
mp = free_list[bucket]; |
353 |
|
free_list[bucket] = mp->next; |
354 |
|
} |
355 |
< |
mp->bucket = bucket; |
355 |
> |
#ifdef MSTATS |
356 |
> |
m_nalloced += bsiz + sizeof(M_HEAD); |
357 |
> |
m_nwasted += bsiz + sizeof(M_HEAD) - n; |
358 |
> |
#endif |
359 |
> |
mp->a.magic = MAGIC; /* tag block */ |
360 |
> |
mp->a.bucket = bucket; |
361 |
|
return((char *)(mp+1)); |
362 |
|
} |
363 |
|
|
364 |
|
|
365 |
|
char * |
366 |
|
realloc(op, n) /* reallocate memory using malloc() */ |
367 |
< |
char *op; |
367 |
> |
register char *op; |
368 |
|
unsigned n; |
369 |
|
{ |
370 |
< |
register char *p; |
370 |
> |
char *p; |
371 |
|
register unsigned on; |
372 |
< |
|
373 |
< |
if (op != NULL) |
374 |
< |
on = 1 << ((M_HEAD *)op-1)->bucket; |
372 |
> |
/* get old size */ |
373 |
> |
if (op != DUMMYLOC && !BADPTR(op) && |
374 |
> |
((M_HEAD *)op-1)->a.magic == MAGIC) |
375 |
> |
on = 1 << ((M_HEAD *)op-1)->a.bucket; |
376 |
|
else |
377 |
|
on = 0; |
378 |
< |
if (n <= on && n > on>>1) |
378 |
> |
if (n <= on && (n > on>>1 || on == 1<<FIRSTBUCKET)) |
379 |
|
return(op); /* same bucket */ |
380 |
< |
p = malloc(n); |
381 |
< |
if (p == NULL) |
382 |
< |
return(NULL); |
380 |
> |
if ((p = malloc(n)) == NULL) |
381 |
> |
return(n<=on ? op : NULL); |
382 |
> |
if (on) { |
383 |
|
#ifdef BSD |
384 |
< |
bcopy(op, p, n>on ? on : n); |
384 |
> |
bcopy(op, p, n>on ? on : n); |
385 |
|
#else |
386 |
< |
(void)memcpy(p, op, n>on ? on : n); |
386 |
> |
(void)memcpy(p, op, n>on ? on : n); |
387 |
|
#endif |
388 |
< |
free(op); |
388 |
> |
free(op); |
389 |
> |
} |
390 |
|
return(p); |
391 |
|
} |
392 |
|
|
397 |
|
register M_HEAD *mp; |
398 |
|
register int bucket; |
399 |
|
|
400 |
+ |
if (p == DUMMYLOC) |
401 |
+ |
return(1); |
402 |
+ |
if (BADPTR(p)) |
403 |
+ |
goto invalid; |
404 |
|
mp = (M_HEAD *)p - 1; |
405 |
< |
bucket = mp->bucket; |
405 |
> |
if (mp->a.magic != MAGIC) /* sanity check */ |
406 |
> |
goto invalid; |
407 |
> |
bucket = mp->a.bucket; |
408 |
> |
if (bucket < FIRSTBUCKET | bucket >= NBUCKETS) |
409 |
> |
goto invalid; |
410 |
|
mp->next = free_list[bucket]; |
411 |
|
free_list[bucket] = mp; |
412 |
+ |
#ifdef MSTATS |
413 |
+ |
m_nfreed += (1 << bucket) + sizeof(M_HEAD); |
414 |
+ |
#endif |
415 |
+ |
return(1); |
416 |
+ |
invalid: |
417 |
+ |
errno = EINVAL; |
418 |
+ |
return(0); |
419 |
|
} |
420 |
|
|
421 |
|
|
422 |
< |
#ifndef NOVMEM |
423 |
< |
#ifndef BSD |
424 |
< |
#include <sys/var.h> |
177 |
< |
int |
178 |
< |
getpagesize() /* use SYSV var structure to get page size */ |
422 |
> |
#ifdef MSTATS |
423 |
> |
printmemstats(fp) /* print memory statistics to stream */ |
424 |
> |
FILE *fp; |
425 |
|
{ |
426 |
< |
static int pagesz = 0; |
427 |
< |
struct var v; |
426 |
> |
register int i; |
427 |
> |
int n; |
428 |
> |
register M_HEAD *mp; |
429 |
> |
unsigned int total = 0; |
430 |
|
|
431 |
< |
if (pagesz == 0) { |
432 |
< |
uvar(&v); |
433 |
< |
pagesz = 1 << v.v_pageshift; |
431 |
> |
fprintf(fp, "Memory statistics:\n"); |
432 |
> |
fprintf(fp, "\tbmalloc: %d bytes from sbrk\n", b_nsbrked); |
433 |
> |
fprintf(fp, "\tbmalloc: %d bytes allocated\n", b_nalloced); |
434 |
> |
fprintf(fp, "\tbmalloc: %d bytes freed\n", b_nfreed); |
435 |
> |
fprintf(fp, "\tbmalloc: %d bytes scrounged\n", b_nscrounged); |
436 |
> |
fprintf(fp, "\tbmalloc: %d bytes compacted\n", b_ncompacted); |
437 |
> |
fprintf(fp, "\tmalloc: %d bytes allocated\n", m_nalloced); |
438 |
> |
fprintf(fp, "\tmalloc: %d bytes wasted (%.1f%%)\n", m_nwasted, |
439 |
> |
100.0*m_nwasted/m_nalloced); |
440 |
> |
fprintf(fp, "\tmalloc: %d bytes freed\n", m_nfreed); |
441 |
> |
for (i = NBUCKETS-1; i >= FIRSTBUCKET; i--) { |
442 |
> |
n = 0; |
443 |
> |
for (mp = free_list[i]; mp != NULL; mp = mp->next) |
444 |
> |
n++; |
445 |
> |
if (n) { |
446 |
> |
fprintf(fp, "\t%d * %u\n", n, 1<<i); |
447 |
> |
total += n * ((1<<i) + sizeof(M_HEAD)); |
448 |
> |
} |
449 |
|
} |
450 |
< |
return(pagesz); |
450 |
> |
fprintf(fp, "\t %u total bytes in free list\n", total); |
451 |
|
} |
189 |
– |
#endif |
452 |
|
#endif |