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.

/*
 * Copyright (C) Nginx, Inc.
 */

#ifndef _NGX_SETAFFINITY_H_INCLUDED_
#define _NGX_SETAFFINITY_H_INCLUDED_


#if (NGX_HAVE_SCHED_SETAFFINITY || NGX_HAVE_CPUSET_SETAFFINITY)

#define NGX_HAVE_CPU_AFFINITY 1

void ngx_setaffinity(uint64_t cpu_affinity, ngx_log_t *log);

#else

#define ngx_setaffinity(cpu_affinity, log)

#endif


#endif /* _NGX_SETAFFINITY_H_INCLUDED_ */