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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2008-10-18 20:28:10 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:52:38 -0700
commit5b4e655e948d8b6e9b0d001616d4c9d7e7ffe924 (patch)
tree2822f944d1bdbc8414a65cd94b982c51b5032b50 /mm
parentb7abea9630bc8ffc663a751e46680db25c4cdf8d (diff)
downloadconfigs-5b4e655e948d8b6e9b0d001616d4c9d7e7ffe924.tar.gz
memcg: avoid accounting special pages
There are not-on-LRU pages which can be mapped and they are not worth to be accounted. (becasue we can't shrink them and need dirty codes to handle specical case) We'd like to make use of usual objrmap/radix-tree's protcol and don't want to account out-of-vm's control pages. When special_mapping_fault() is called, page->mapping is tend to be NULL and it's charged as Anonymous page. insert_page() also handles some special pages from drivers. This patch is for avoiding to account special pages. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c25
-rw-r--r--mm/rmap.c4
2 files changed, 13 insertions, 16 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 54cf20ee0a8..3a6c4a65832 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1323,18 +1323,14 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
pte_t *pte;
spinlock_t *ptl;
- retval = mem_cgroup_charge(page, mm, GFP_KERNEL);
- if (retval)
- goto out;
-
retval = -EINVAL;
if (PageAnon(page))
- goto out_uncharge;
+ goto out;
retval = -ENOMEM;
flush_dcache_page(page);
pte = get_locked_pte(mm, addr, &ptl);
if (!pte)
- goto out_uncharge;
+ goto out;
retval = -EBUSY;
if (!pte_none(*pte))
goto out_unlock;
@@ -1350,8 +1346,6 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
return retval;
out_unlock:
pte_unmap_unlock(pte, ptl);
-out_uncharge:
- mem_cgroup_uncharge_page(page);
out:
return retval;
}
@@ -2463,6 +2457,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
struct page *page;
pte_t entry;
int anon = 0;
+ int charged = 0;
struct page *dirty_page = NULL;
struct vm_fault vmf;
int ret;
@@ -2503,6 +2498,12 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
ret = VM_FAULT_OOM;
goto out;
}
+ if (mem_cgroup_charge(page, mm, GFP_KERNEL)) {
+ ret = VM_FAULT_OOM;
+ page_cache_release(page);
+ goto out;
+ }
+ charged = 1;
/*
* Don't let another task, with possibly unlocked vma,
* keep the mlocked page.
@@ -2543,11 +2544,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
}
- if (mem_cgroup_charge(page, mm, GFP_KERNEL)) {
- ret = VM_FAULT_OOM;
- goto out;
- }
-
page_table = pte_offset_map_lock(mm, pmd, address, &ptl);
/*
@@ -2585,7 +2581,8 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
/* no need to invalidate: a not-present page won't be cached */
update_mmu_cache(vma, address, entry);
} else {
- mem_cgroup_uncharge_page(page);
+ if (charged)
+ mem_cgroup_uncharge_page(page);
if (anon)
page_cache_release(page);
else
diff --git a/mm/rmap.c b/mm/rmap.c
index 7e90bebbeb6..8701d5fce73 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -727,8 +727,8 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma)
page_clear_dirty(page);
set_page_dirty(page);
}
-
- mem_cgroup_uncharge_page(page);
+ if (PageAnon(page))
+ mem_cgroup_uncharge_page(page);
__dec_zone_page_state(page,
PageAnon(page) ? NR_ANON_PAGES : NR_FILE_MAPPED);
/*