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mm: add swap cache interface for swap reference

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In a following patch, the usage of swap cache is recorded into swap_map.
This patch is for necessary interface changes to do that.

2 interfaces:

  - swapcache_prepare()
  - swapcache_free()

are added for allocating/freeing refcnt from swap-cache to existing swap
entries.  But implementation itself is not changed under this patch.  At
adding swapcache_free(), memcg's hook code is moved under
swapcache_free().  This is better than using scattered hooks.

Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Reviewed-by: Daisuke Nishimura <[email protected]>
Acked-by: Balbir Singh <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Dhaval Giani <[email protected]>
Cc: YAMAMOTO Takashi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2009-06-16 15:32:52 -07:00 • committed by Linus Torvalds
commit cb4b86ba47
5 changed files with 33 additions and 9 deletions
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19
mm/swapfile.c
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@ -509,6 +509,16 @@ void swap_free(swp_entry_t entry)
}
}
/*
* Called after dropping swapcache to decrease refcnt to swap entries.
*/
void swapcache_free(swp_entry_t entry, struct page *page)
{
if (page)
mem_cgroup_uncharge_swapcache(page, entry);
return swap_free(entry);
}
/*
* How many references to page are currently swapped out?
*/
@ -1979,6 +1989,15 @@ bad_file:
goto out;
}
/*
* Called when allocating swap cache for exising swap entry,
*/
int swapcache_prepare(swp_entry_t entry)
{
return swap_duplicate(entry);
}
struct swap_info_struct *
get_swap_info_struct(unsigned type)
{