version 1.19.4.1, 2010/03/13 00:53:32 |
version 1.22, 2011/02/26 23:27:49 |
Line 319 __strerror_r(int e, char *s, size_t l) |
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Line 319 __strerror_r(int e, char *s, size_t l) |
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#define SMALL_MAX_DEFAULT (1 << SMALL_MAX_2POW_DEFAULT) |
#define SMALL_MAX_DEFAULT (1 << SMALL_MAX_2POW_DEFAULT) |
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/* |
/* |
* Maximum desired run header overhead. Runs are sized as small as possible |
* RUN_MAX_OVRHD indicates maximum desired run header overhead. Runs are sized |
* such that this setting is still honored, without violating other constraints. |
* as small as possible such that this setting is still honored, without |
* The goal is to make runs as small as possible without exceeding a per run |
* violating other constraints. The goal is to make runs as small as possible |
* external fragmentation threshold. |
* without exceeding a per run external fragmentation threshold. |
* |
* |
* Note that it is possible to set this low enough that it cannot be honored |
* We use binary fixed point math for overhead computations, where the binary |
* for some/all object sizes, since there is one bit of header overhead per |
* point is implicitly RUN_BFP bits to the left. |
* object (plus a constant). In such cases, this constraint is relaxed. |
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* |
* |
* RUN_MAX_OVRHD_RELAX specifies the maximum number of bits per region of |
* Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be |
* overhead for which RUN_MAX_OVRHD is relaxed. |
* honored for some/all object sizes, since there is one bit of header overhead |
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* per object (plus a constant). This constraint is relaxed (ignored) for runs |
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* that are so small that the per-region overhead is greater than: |
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* |
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* (RUN_MAX_OVRHD / (reg_size << (3+RUN_BFP)) |
*/ |
*/ |
#define RUN_MAX_OVRHD 0.015 |
#define RUN_BFP 12 |
#define RUN_MAX_OVRHD_RELAX 1.5 |
/* \/ Implicit binary fixed point. */ |
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#define RUN_MAX_OVRHD 0x0000003dU |
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#define RUN_MAX_OVRHD_RELAX 0x00001800U |
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/* Put a cap on small object run size. This overrides RUN_MAX_OVRHD. */ |
/* Put a cap on small object run size. This overrides RUN_MAX_OVRHD. */ |
#define RUN_MAX_SMALL_2POW 15 |
#define RUN_MAX_SMALL_2POW 15 |
Line 1029 base_pages_alloc(size_t minsize) |
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Line 1034 base_pages_alloc(size_t minsize) |
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*/ |
*/ |
incr = (intptr_t)chunksize |
incr = (intptr_t)chunksize |
- (intptr_t)CHUNK_ADDR2OFFSET(brk_cur); |
- (intptr_t)CHUNK_ADDR2OFFSET(brk_cur); |
if (incr < minsize) |
assert(incr >= 0); |
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if ((size_t)incr < minsize) |
incr += csize; |
incr += csize; |
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brk_prev = sbrk(incr); |
brk_prev = sbrk(incr); |
Line 1364 chunk_alloc(size_t size) |
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Line 1370 chunk_alloc(size_t size) |
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*/ |
*/ |
incr = (intptr_t)size |
incr = (intptr_t)size |
- (intptr_t)CHUNK_ADDR2OFFSET(brk_cur); |
- (intptr_t)CHUNK_ADDR2OFFSET(brk_cur); |
if (incr == size) { |
if (incr == (intptr_t)size) { |
ret = brk_cur; |
ret = brk_cur; |
} else { |
} else { |
ret = (void *)((intptr_t)brk_cur + incr); |
ret = (void *)((intptr_t)brk_cur + incr); |
Line 2142 arena_bin_run_size_calc(arena_bin_t *bin |
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Line 2148 arena_bin_run_size_calc(arena_bin_t *bin |
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size_t try_run_size, good_run_size; |
size_t try_run_size, good_run_size; |
unsigned good_nregs, good_mask_nelms, good_reg0_offset; |
unsigned good_nregs, good_mask_nelms, good_reg0_offset; |
unsigned try_nregs, try_mask_nelms, try_reg0_offset; |
unsigned try_nregs, try_mask_nelms, try_reg0_offset; |
float max_ovrhd = RUN_MAX_OVRHD; |
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assert(min_run_size >= pagesize); |
assert(min_run_size >= pagesize); |
assert(min_run_size <= arena_maxclass); |
assert(min_run_size <= arena_maxclass); |
Line 2160 arena_bin_run_size_calc(arena_bin_t *bin |
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Line 2165 arena_bin_run_size_calc(arena_bin_t *bin |
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*/ |
*/ |
try_run_size = min_run_size; |
try_run_size = min_run_size; |
try_nregs = (unsigned)(((try_run_size - sizeof(arena_run_t)) / |
try_nregs = (unsigned)(((try_run_size - sizeof(arena_run_t)) / |
bin->reg_size) + 1); /* Counter-act the first line of the loop. */ |
bin->reg_size) + 1); /* Counter-act try_nregs-- in loop. */ |
do { |
do { |
try_nregs--; |
try_nregs--; |
try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) + |
try_mask_nelms = (try_nregs >> (SIZEOF_INT_2POW + 3)) + |
Line 2194 arena_bin_run_size_calc(arena_bin_t *bin |
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Line 2199 arena_bin_run_size_calc(arena_bin_t *bin |
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} while (sizeof(arena_run_t) + (sizeof(unsigned) * |
} while (sizeof(arena_run_t) + (sizeof(unsigned) * |
(try_mask_nelms - 1)) > try_reg0_offset); |
(try_mask_nelms - 1)) > try_reg0_offset); |
} while (try_run_size <= arena_maxclass && try_run_size <= RUN_MAX_SMALL |
} while (try_run_size <= arena_maxclass && try_run_size <= RUN_MAX_SMALL |
&& max_ovrhd > RUN_MAX_OVRHD_RELAX / ((float)(bin->reg_size << 3)) |
&& RUN_MAX_OVRHD * (bin->reg_size << 3) > RUN_MAX_OVRHD_RELAX |
&& ((float)(try_reg0_offset)) / ((float)(try_run_size)) > |
&& (try_reg0_offset << RUN_BFP) > RUN_MAX_OVRHD * try_run_size); |
max_ovrhd); |
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assert(sizeof(arena_run_t) + (sizeof(unsigned) * (good_mask_nelms - 1)) |
assert(sizeof(arena_run_t) + (sizeof(unsigned) * (good_mask_nelms - 1)) |
<= good_reg0_offset); |
<= good_reg0_offset); |
Line 3443 malloc_init_hard(void) |
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Line 3447 malloc_init_hard(void) |
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opt_chunk_2pow--; |
opt_chunk_2pow--; |
break; |
break; |
case 'K': |
case 'K': |
/* |
if (opt_chunk_2pow + 1 < |
* There must be fewer pages in a chunk than |
(int)(sizeof(size_t) << 3)) |
* can be recorded by the pos field of |
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* arena_chunk_map_t, in order to make POS_FREE |
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* special. |
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*/ |
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if (opt_chunk_2pow - pagesize_2pow |
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< (sizeof(uint32_t) << 3) - 1) |
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opt_chunk_2pow++; |
opt_chunk_2pow++; |
break; |
break; |
case 'n': |
case 'n': |