9300d8dfd2
There is a memory waste problem if we define field on struct page_ext by hard-coding. Entry size of struct page_ext includes the size of those fields even if it is disabled at runtime. Now, extra memory request at runtime is possible so page_owner don't need to define it's own fields by hard-coding. This patch removes hard-coded define and uses extra memory for storing page_owner information in page_owner. Most of code are just mechanical changes. Link: http://lkml.kernel.org/r/1471315879-32294-7-git-send-email-iamjoonsoo.kim@lge.com Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Minchan Kim <minchan@kernel.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
#ifndef __LINUX_PAGE_EXT_H
|
|
#define __LINUX_PAGE_EXT_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/stackdepot.h>
|
|
|
|
struct pglist_data;
|
|
struct page_ext_operations {
|
|
size_t offset;
|
|
size_t size;
|
|
bool (*need)(void);
|
|
void (*init)(void);
|
|
};
|
|
|
|
#ifdef CONFIG_PAGE_EXTENSION
|
|
|
|
/*
|
|
* page_ext->flags bits:
|
|
*
|
|
* PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
|
|
* implement generic debug pagealloc feature. The pages are filled with
|
|
* poison patterns and set this flag after free_pages(). The poisoned
|
|
* pages are verified whether the patterns are not corrupted and clear
|
|
* the flag before alloc_pages().
|
|
*/
|
|
|
|
enum page_ext_flags {
|
|
PAGE_EXT_DEBUG_POISON, /* Page is poisoned */
|
|
PAGE_EXT_DEBUG_GUARD,
|
|
PAGE_EXT_OWNER,
|
|
#if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
|
|
PAGE_EXT_YOUNG,
|
|
PAGE_EXT_IDLE,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Page Extension can be considered as an extended mem_map.
|
|
* A page_ext page is associated with every page descriptor. The
|
|
* page_ext helps us add more information about the page.
|
|
* All page_ext are allocated at boot or memory hotplug event,
|
|
* then the page_ext for pfn always exists.
|
|
*/
|
|
struct page_ext {
|
|
unsigned long flags;
|
|
};
|
|
|
|
extern void pgdat_page_ext_init(struct pglist_data *pgdat);
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
static inline void page_ext_init_flatmem(void)
|
|
{
|
|
}
|
|
extern void page_ext_init(void);
|
|
#else
|
|
extern void page_ext_init_flatmem(void);
|
|
static inline void page_ext_init(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
struct page_ext *lookup_page_ext(struct page *page);
|
|
|
|
#else /* !CONFIG_PAGE_EXTENSION */
|
|
struct page_ext;
|
|
|
|
static inline void pgdat_page_ext_init(struct pglist_data *pgdat)
|
|
{
|
|
}
|
|
|
|
static inline struct page_ext *lookup_page_ext(struct page *page)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void page_ext_init(void)
|
|
{
|
|
}
|
|
|
|
static inline void page_ext_init_flatmem(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_PAGE_EXTENSION */
|
|
#endif /* __LINUX_PAGE_EXT_H */
|