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memcontrol: add vm_match_cgroup()

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mm_cgroup() is exclusively used to test whether an mm's mem_cgroup pointer
is pointing to a specific cgroup.  Instead of returning the pointer, we can
just do the test itself in a new macro:

	vm_match_cgroup(mm, cgroup)

returns non-zero if the mm's mem_cgroup points to cgroup.  Otherwise it
returns zero.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2008-02-09 00:10:15 -08:00 committed by Linus Torvalds
parent 6966a97753
commit 60c12b1202
3 changed files with 7 additions and 9 deletions
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10
include/linux/memcontrol.h
View file

@ -51,10 +51,8 @@ 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);
static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
{
return rcu_dereference(mm->mem_cgroup);
}
#define vm_match_cgroup(mm, cgroup) \
((cgroup) == rcu_dereference((mm)->mem_cgroup))
extern int mem_cgroup_prepare_migration(struct page *page);
extern void mem_cgroup_end_migration(struct page *page);
@ -123,9 +121,9 @@ static inline int mem_cgroup_cache_charge(struct page *page,
return 0;
}
static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
static inline int vm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)
{
return NULL;
return 1;
}
static inline int task_in_mem_cgroup(struct task_struct *task,

2
mm/memcontrol.c
View file

@ -399,7 +399,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
int ret;
task_lock(task);
ret = task->mm && mm_cgroup(task->mm) == mem;
ret = task->mm && vm_match_cgroup(task->mm, mem);
task_unlock(task);
return ret;
}

4
mm/rmap.c
View file

@ -321,7 +321,7 @@ static int page_referenced_anon(struct page *page,
* counting on behalf of references from different
* cgroups
*/
if (mem_cont && (mm_cgroup(vma->vm_mm) != mem_cont))
if (mem_cont && !vm_match_cgroup(vma->vm_mm, mem_cont))
continue;
referenced += page_referenced_one(page, vma, &mapcount);
if (!mapcount)
@ -382,7 +382,7 @@ static int page_referenced_file(struct page *page,
* counting on behalf of references from different
* cgroups
*/
if (mem_cont && (mm_cgroup(vma->vm_mm) != mem_cont))
if (mem_cont && !vm_match_cgroup(vma->vm_mm, mem_cont))
continue;
if ((vma->vm_flags & (VM_LOCKED|VM_MAYSHARE))
== (VM_LOCKED|VM_MAYSHARE)) {