Mercurial > hg > nginx
comparison src/http/ngx_http_cache.h @ 6445:c9d680b00744
Cache: added watermark to reduce IO load when keys_zone is full.
When a keys_zone is full then each next request to the cache is
penalized. That is, the cache has to evict older files to get a
slot from the keys_zone synchronously. The patch introduces new
behavior in this scenario. Manager will try to maintain available
free slots in the keys_zone by cleaning old files in the background.
| author | Dmitry Volyntsev <xeioex@nginx.com> |
|---|---|
| date | Fri, 18 Mar 2016 15:08:21 +0300 |
| parents | 043914d19be8 |
| children | e08e741f74cd |
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| 6444:043914d19be8 | 6445:c9d680b00744 |
|---|---|
| 136 ngx_rbtree_node_t sentinel; | 136 ngx_rbtree_node_t sentinel; |
| 137 ngx_queue_t queue; | 137 ngx_queue_t queue; |
| 138 ngx_atomic_t cold; | 138 ngx_atomic_t cold; |
| 139 ngx_atomic_t loading; | 139 ngx_atomic_t loading; |
| 140 off_t size; | 140 off_t size; |
| 141 ngx_uint_t count; | |
| 142 ngx_uint_t watermark; | |
| 141 } ngx_http_file_cache_sh_t; | 143 } ngx_http_file_cache_sh_t; |
| 142 | 144 |
| 143 | 145 |
| 144 struct ngx_http_file_cache_s { | 146 struct ngx_http_file_cache_s { |
| 145 ngx_http_file_cache_sh_t *sh; | 147 ngx_http_file_cache_sh_t *sh; |