Mastering Linux Kernel Development

Action modifiers

The following code snippet defines action modifiers:

#define __GFP_COLD ((__force gfp_t)___GFP_COLD)#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN)#define __GFP_COMP ((__force gfp_t)___GFP_COMP)#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK)#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE)

Following is a list of action modifier flags; these flags specify additional attributes to be considered by the allocator routines while processing a request:

• __GFP_COLD: To enable quick access, a few pages in each zone are cached into per-CPU caches; pages held in cache are referred to as hot, and uncached pages are referred ...