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view src/core/ngx_slab.h @ 4113:a28ba1cdec27
Buffers reuse in chunked filter.
There were 2 buffers allocated on each buffer chain sent through chunked
filter (one buffer for chunk size, another one for trailing CRLF, about
120 bytes in total on 32-bit platforms). This resulted in large memory
consumption with long-lived requests sending many buffer chains. Usual
example of problematic scenario is streaming though proxy with
proxy_buffering set to off.
Introduced buffers reuse reduces memory consumption in the above problematic
scenario.
See here for initial report:
http://mailman.nginx.org/pipermail/nginx/2010-April/019814.html
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 15 Sep 2011 15:25:42 +0000 |
parents | 5ff1ae0eada7 |
children | 3f6040cd731e 4919fb357a5d |
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/* * Copyright (C) Igor Sysoev */ #ifndef _NGX_SLAB_H_INCLUDED_ #define _NGX_SLAB_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> typedef struct ngx_slab_page_s ngx_slab_page_t; struct ngx_slab_page_s { uintptr_t slab; ngx_slab_page_t *next; uintptr_t prev; }; typedef struct { ngx_atomic_t lock; size_t min_size; size_t min_shift; ngx_slab_page_t *pages; ngx_slab_page_t free; u_char *start; u_char *end; ngx_shmtx_t mutex; u_char *log_ctx; u_char zero; void *data; void *addr; } ngx_slab_pool_t; void ngx_slab_init(ngx_slab_pool_t *pool); void *ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size); void *ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size); void ngx_slab_free(ngx_slab_pool_t *pool, void *p); void ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p); #endif /* _NGX_SLAB_H_INCLUDED_ */