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memcg: remove mem_cgroup_uncharge

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Nothing uses mem_cgroup_uncharge apart from mem_cgroup_uncharge_page, (a
trivial wrapper around it) and mem_cgroup_end_migration (which does the same
as mem_cgroup_uncharge_page).  And it often ends up having to lock just to let
its caller unlock.  Remove it (but leave the silly locking until a later
patch).

Moved mem_cgroup_cache_charge next to mem_cgroup_charge in memcontrol.h.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hirokazu Takahashi <taka@valinux.co.jp>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2008-03-04 14:29:08 -08:00 committed by Linus Torvalds
parent 7e924aafa4
commit 8289546e57
2 changed files with 15 additions and 28 deletions
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20
include/linux/memcontrol.h
View file

@ -35,7 +35,8 @@ extern void mm_free_cgroup(struct mm_struct *mm);
extern struct page_cgroup *page_get_page_cgroup(struct page *page);
extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
extern void mem_cgroup_uncharge(struct page_cgroup *pc);
extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
extern void mem_cgroup_uncharge_page(struct page *page);
extern void mem_cgroup_move_lists(struct page *page, bool active);
extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
@ -45,8 +46,6 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct mem_cgroup *mem_cont,
int active);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
#define mm_match_cgroup(mm, cgroup) \
@ -92,14 +91,16 @@ static inline struct page_cgroup *page_get_page_cgroup(struct page *page)
return NULL;
}
static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
static inline int mem_cgroup_charge(struct page *page,
struct mm_struct *mm, gfp_t gfp_mask)
{
return 0;
}
static inline void mem_cgroup_uncharge(struct page_cgroup *pc)
static inline int mem_cgroup_cache_charge(struct page *page,
struct mm_struct *mm, gfp_t gfp_mask)
{
return 0;
}
static inline void mem_cgroup_uncharge_page(struct page *page)
@ -110,13 +111,6 @@ static inline void mem_cgroup_move_lists(struct page *page, bool active)
{
}
static inline int mem_cgroup_cache_charge(struct page *page,
struct mm_struct *mm,
gfp_t gfp_mask)
{
return 0;
}
static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
{
return 1;

23
mm/memcontrol.c
View file

@ -697,20 +697,22 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
/*
* Uncharging is always a welcome operation, we never complain, simply
* uncharge. This routine should be called with lock_page_cgroup held
* uncharge.
*/
void mem_cgroup_uncharge(struct page_cgroup *pc)
void mem_cgroup_uncharge_page(struct page *page)
{
struct page_cgroup *pc;
struct mem_cgroup *mem;
struct mem_cgroup_per_zone *mz;
struct page *page;
unsigned long flags;
/*
* Check if our page_cgroup is valid
*/
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
if (!pc)
return;
goto unlock;
if (atomic_dec_and_test(&pc->ref_cnt)) {
page = pc->page;
@ -731,12 +733,8 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
}
lock_page_cgroup(page);
}
}
void mem_cgroup_uncharge_page(struct page *page)
{
lock_page_cgroup(page);
mem_cgroup_uncharge(page_get_page_cgroup(page));
unlock:
unlock_page_cgroup(page);
}
@ -759,12 +757,7 @@ int mem_cgroup_prepare_migration(struct page *page)
void mem_cgroup_end_migration(struct page *page)
{
struct page_cgroup *pc;
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
mem_cgroup_uncharge(pc);
unlock_page_cgroup(page);
mem_cgroup_uncharge_page(page);
}
/*
* We know both *page* and *newpage* are now not-on-LRU and Pg_locked.