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mm, THP, swap: unify swap slot free functions to put_swap_page 

Now, get_swap_page takes struct page and allocates swap space according
to page size(ie, normal or THP) so it would be more cleaner to introduce
put_swap_page which is a counter function of get_swap_page.  Then, it
calls right swap slot free function depending on page's size.

[ying.huang@intel.com: minor cleanup and fix]
Link: http://lkml.kernel.org/r/20170515112522.32457-3-ying.huang@intel.com
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2017-07-06 15:37:21 -07:00 committed by Linus Torvalds
parent 38d8b4e6bd
commit 75f6d6d29a
5 changed files with 21 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/swap.h
View File

@ -387,6 +387,7 @@ static inline long get_nr_swap_pages(void)
extern void si_swapinfo(struct sysinfo *);
extern swp_entry_t get_swap_page(struct page *page);
extern void put_swap_page(struct page *page, swp_entry_t entry);
extern swp_entry_t get_swap_page_of_type(int);
extern int get_swap_pages(int n, bool cluster, swp_entry_t swp_entries[]);
extern int add_swap_count_continuation(swp_entry_t, gfp_t);
@ -394,7 +395,6 @@ extern void swap_shmem_alloc(swp_entry_t);
extern int swap_duplicate(swp_entry_t);
extern int swapcache_prepare(swp_entry_t);
extern void swap_free(swp_entry_t);
extern void swapcache_free(swp_entry_t);
extern void swapcache_free_entries(swp_entry_t *entries, int n);
extern int free_swap_and_cache(swp_entry_t);
extern int swap_type_of(dev_t, sector_t, struct block_device **);
@ -453,7 +453,7 @@ static inline void swap_free(swp_entry_t swp)
{
}
static inline void swapcache_free(swp_entry_t swp)
static inline void put_swap_page(struct page *page, swp_entry_t swp)
{
}
@ -578,13 +578,5 @@ static inline bool mem_cgroup_swap_full(struct page *page)
}
#endif
#ifdef CONFIG_THP_SWAP
extern void swapcache_free_cluster(swp_entry_t entry);
#else
static inline void swapcache_free_cluster(swp_entry_t entry)
{
}
#endif
#endif /* __KERNEL__*/
#endif /* _LINUX_SWAP_H */

2
mm/shmem.c
View File

@ -1327,7 +1327,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
mutex_unlock(&shmem_swaplist_mutex);
free_swap:
swapcache_free(swap);
put_swap_page(page, swap);
redirty:
set_page_dirty(page);
if (wbc->for_reclaim)

13
mm/swap_state.c
View File

@ -231,10 +231,7 @@ retry:
return 1;
fail_free:
if (PageTransHuge(page))
swapcache_free_cluster(entry);
else
swapcache_free(entry);
put_swap_page(page, entry);
fail:
if (PageTransHuge(page) && !split_huge_page_to_list(page, list))
goto retry;
@ -259,11 +256,7 @@ void delete_from_swap_cache(struct page *page)
__delete_from_swap_cache(page);
spin_unlock_irq(&address_space->tree_lock);
if (PageTransHuge(page))
swapcache_free_cluster(entry);
else
swapcache_free(entry);
put_swap_page(page, entry);
page_ref_sub(page, hpage_nr_pages(page));
}
@ -415,7 +408,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* add_to_swap_cache() doesn't return -EEXIST, so we can safely
* clear SWAP_HAS_CACHE flag.
*/
swapcache_free(entry);
put_swap_page(new_page, entry);
} while (err != -ENOMEM);
if (new_page)

16
mm/swapfile.c
View File

@ -1148,7 +1148,7 @@ void swap_free(swp_entry_t entry)
/*
* Called after dropping swapcache to decrease refcnt to swap entries.
*/
void swapcache_free(swp_entry_t entry)
static void swapcache_free(swp_entry_t entry)
{
struct swap_info_struct *p;
@ -1160,7 +1160,7 @@ void swapcache_free(swp_entry_t entry)
}
#ifdef CONFIG_THP_SWAP
void swapcache_free_cluster(swp_entry_t entry)
static void swapcache_free_cluster(swp_entry_t entry)
{
unsigned long offset = swp_offset(entry);
unsigned long idx = offset / SWAPFILE_CLUSTER;
@ -1184,8 +1184,20 @@ void swapcache_free_cluster(swp_entry_t entry)
swap_free_cluster(si, idx);
spin_unlock(&si->lock);
}
#else
static inline void swapcache_free_cluster(swp_entry_t entry)
{
}
#endif /* CONFIG_THP_SWAP */
void put_swap_page(struct page *page, swp_entry_t entry)
{
if (!PageTransHuge(page))
swapcache_free(entry);
else
swapcache_free_cluster(entry);
}
void swapcache_free_entries(swp_entry_t *entries, int n)
{
struct swap_info_struct *p, *prev;

2
mm/vmscan.c
View File

@ -708,7 +708,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page,
mem_cgroup_swapout(page, swap);
__delete_from_swap_cache(page);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
swapcache_free(swap);
put_swap_page(page, swap);
} else {
void (*freepage)(struct page *);
void *shadow = NULL;