Mastering Linux Kernel Development

Page mobility and placement

The following code snippet defines page mobility and placement flags:

#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE)#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE)#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL)#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)#define __GFP_ACCOUNT ((__force gfp_t)___GFP_ACCOUNT)

Following is a list of page mobility and placement flags:

• __GFP_RECLAIMABLE: Most kernel subsystems are designed to engage memory caches for caching frequently needed resources such as data structures, memory blocks, persistent file data, and so on. The memory manager maintains such caches and allows them to dynamically expand on demand. However, such caches cannot be allowed ...