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Slab: simplified allocation from slots.

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Removed code that would cause an endless loop, and removed condition
check that is always false.  The first page in the slot list is
guaranteed to satisfy an allocation.
This commit is contained in:
Ruslan Ermilov 2016-12-07 22:25:37 +03:00
parent 16de9fc3b5
commit 12abb66c41
1 changed files with 66 additions and 84 deletions
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22
src/core/ngx_slab.c
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@ -215,7 +215,6 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
if (shift < ngx_slab_exact_shift) {
do {
bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
map = (1 << (ngx_pagesize_shift - shift))
@ -259,15 +258,8 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
}
}
page = page->next;
} while (page);
} else if (shift == ngx_slab_exact_shift) {
do {
if (page->slab != NGX_SLAB_BUSY) {
for (m = 1, i = 0; m; m <<= 1, i++) {
if (page->slab & m) {
continue;
@ -288,11 +280,6 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
goto done;
}
}
page = page->next;
} while (page);
} else { /* shift > ngx_slab_exact_shift */
@ -301,9 +288,6 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
n = ((uintptr_t) 1 << n) - 1;
mask = n << NGX_SLAB_MAP_SHIFT;
do {
if ((page->slab & NGX_SLAB_MAP_MASK) != mask) {
for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0;
m & mask;
m <<= 1, i++)
@ -329,10 +313,8 @@ ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
}
}
page = page->next;
} while (page);
}
ngx_slab_error(pool, NGX_LOG_ALERT, "ngx_slab_alloc(): page is busy");
ngx_debug_point();
}
page = ngx_slab_alloc_pages(pool, 1);