Mercurial > hg > nginx
comparison src/core/ngx_slab.h @ 5718:c46657e391a3
Core: slab allocator free pages defragmentation.
Large allocations from a slab pool result in free page blocks being fragmented,
eventually leading to a situation when no further allocation larger than a page
size are possible from the pool. While this isn't a problem for nginx itself,
it is known to be bad for various 3rd party modules. Fix is to merge adjacent
blocks of free pages in the ngx_slab_free_pages() function.
Prodded by Wandenberg Peixoto and Yichun Zhang.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Tue, 03 Jun 2014 17:53:03 +0400 |
| parents | 5024d29354f1 |
| children | 25ade23cf281 |
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| 5717:efc84a5723b3 | 5718:c46657e391a3 |
|---|---|
| 27 | 27 |
| 28 size_t min_size; | 28 size_t min_size; |
| 29 size_t min_shift; | 29 size_t min_shift; |
| 30 | 30 |
| 31 ngx_slab_page_t *pages; | 31 ngx_slab_page_t *pages; |
| 32 ngx_slab_page_t *last; | |
| 32 ngx_slab_page_t free; | 33 ngx_slab_page_t free; |
| 33 | 34 |
| 34 u_char *start; | 35 u_char *start; |
| 35 u_char *end; | 36 u_char *end; |
| 36 | 37 |