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Slab: simplified some math.

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No functional changes.
This commit is contained in:
Ruslan Ermilov 2016-12-07 22:25:37 +03:00
parent 12abb66c41
commit 366f131c38
1 changed files with 12 additions and 17 deletions
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29
src/core/ngx_slab.c
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@ -217,8 +217,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
map = (1 << (ngx_pagesize_shift - shift))
/ (sizeof(uintptr_t) * 8);
map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
for (n = 0; n < map; n++) {
@ -231,8 +230,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
bitmap[n] |= m;
i = ((n * sizeof(uintptr_t) * 8) << shift)
+ (i << shift);
i = (n * sizeof(uintptr_t) * 8 + i) << shift;
if (bitmap[n] == NGX_SLAB_BUSY) {
for (n = n + 1; n < map; n++) {
@ -283,10 +281,8 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
} else { /* shift > ngx_slab_exact_shift */
n = ngx_pagesize_shift - (page->slab & NGX_SLAB_SHIFT_MASK);
n = 1 << n;
n = ((uintptr_t) 1 << n) - 1;
mask = n << NGX_SLAB_MAP_SHIFT;
mask = ((uintptr_t) 1 << (ngx_pagesize >> shift)) - 1;
mask <<= NGX_SLAB_MAP_SHIFT;
for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0;
m & mask;
@ -323,16 +319,15 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
if (shift < ngx_slab_exact_shift) {
bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
s = 1 << shift;
n = (1 << (ngx_pagesize_shift - shift)) / 8 / s;
n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
if (n == 0) {
n = 1;
}
bitmap[0] = (2 << n) - 1;
bitmap[0] = ((uintptr_t) 2 << n) - 1;
map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
for (i = 1; i < map; i++) {
bitmap[i] = 0;
@ -344,7 +339,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
slots[slot].next = page;
p = ngx_slab_page_addr(pool, page) + s * n;
p = ngx_slab_page_addr(pool, page) + (n << shift);
goto done;
@ -457,8 +452,8 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
}
n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
m = (uintptr_t) 1 << (n & (sizeof(uintptr_t) * 8 - 1));
n /= (sizeof(uintptr_t) * 8);
m = (uintptr_t) 1 << (n % (sizeof(uintptr_t) * 8));
n /= sizeof(uintptr_t) * 8;
bitmap = (uintptr_t *)
((uintptr_t) p & ~((uintptr_t) ngx_pagesize - 1));
@ -477,7 +472,7 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
bitmap[n] &= ~m;
n = (1 << (ngx_pagesize_shift - shift)) / 8 / (1 << shift);
n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
if (n == 0) {
n = 1;
@ -487,7 +482,7 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
goto done;
}
map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
for (n = 1; n < map; n++) {
if (bitmap[n]) {