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synced 2024-12-28 18:01:09 -06:00
Slab: simplified some math.
No functional changes.
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12abb66c41
commit
366f131c38
@ -217,8 +217,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
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map = (1 << (ngx_pagesize_shift - shift))
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/ (sizeof(uintptr_t) * 8);
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map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
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for (n = 0; n < map; n++) {
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@ -231,8 +230,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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bitmap[n] |= m;
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i = ((n * sizeof(uintptr_t) * 8) << shift)
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+ (i << shift);
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i = (n * sizeof(uintptr_t) * 8 + i) << shift;
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if (bitmap[n] == NGX_SLAB_BUSY) {
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for (n = n + 1; n < map; n++) {
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@ -283,10 +281,8 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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} else { /* shift > ngx_slab_exact_shift */
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n = ngx_pagesize_shift - (page->slab & NGX_SLAB_SHIFT_MASK);
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n = 1 << n;
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n = ((uintptr_t) 1 << n) - 1;
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mask = n << NGX_SLAB_MAP_SHIFT;
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mask = ((uintptr_t) 1 << (ngx_pagesize >> shift)) - 1;
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mask <<= NGX_SLAB_MAP_SHIFT;
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for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0;
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m & mask;
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@ -323,16 +319,15 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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if (shift < ngx_slab_exact_shift) {
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bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
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s = 1 << shift;
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n = (1 << (ngx_pagesize_shift - shift)) / 8 / s;
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n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
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if (n == 0) {
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n = 1;
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}
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bitmap[0] = (2 << n) - 1;
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bitmap[0] = ((uintptr_t) 2 << n) - 1;
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map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
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map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
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for (i = 1; i < map; i++) {
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bitmap[i] = 0;
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@ -344,7 +339,7 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
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slots[slot].next = page;
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p = ngx_slab_page_addr(pool, page) + s * n;
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p = ngx_slab_page_addr(pool, page) + (n << shift);
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goto done;
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@ -457,8 +452,8 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
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}
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n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
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m = (uintptr_t) 1 << (n & (sizeof(uintptr_t) * 8 - 1));
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n /= (sizeof(uintptr_t) * 8);
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m = (uintptr_t) 1 << (n % (sizeof(uintptr_t) * 8));
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n /= sizeof(uintptr_t) * 8;
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bitmap = (uintptr_t *)
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((uintptr_t) p & ~((uintptr_t) ngx_pagesize - 1));
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@ -477,7 +472,7 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
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bitmap[n] &= ~m;
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n = (1 << (ngx_pagesize_shift - shift)) / 8 / (1 << shift);
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n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
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if (n == 0) {
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n = 1;
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@ -487,7 +482,7 @@ ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
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goto done;
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}
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map = (1 << (ngx_pagesize_shift - shift)) / (sizeof(uintptr_t) * 8);
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map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
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for (n = 1; n < map; n++) {
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if (bitmap[n]) {
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