Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=217bc3194d57150549e9234e6ddfee30de28cc78
Commit: 217bc3194d57150549e9234e6ddfee30de28cc78
Parent: cc8475822f8a4b17e9b76e7fadb6b9a341860422
Author: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:14:17 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:20 2008 -0800
memory cgroup enhancements: remember "a page is charged as page cache"
Add a flag to page_cgroup to remember "this page is
charged as cache."
cache here includes page caches and swap cache.
This is useful for implementing precise accounting in memory cgroup.
TODO:
distinguish page-cache and swap-cache
Signed-off-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
Signed-off-by: YAMAMOTO Takashi <[EMAIL PROTECTED]>
Cc: Balbir Singh <[EMAIL PROTECTED]>
Cc: Pavel Emelianov <[EMAIL PROTECTED]>
Cc: Paul Menage <[EMAIL PROTECTED]>
Cc: Peter Zijlstra <[EMAIL PROTECTED]>
Cc: "Eric W. Biederman" <[EMAIL PROTECTED]>
Cc: Nick Piggin <[EMAIL PROTECTED]>
Cc: Kirill Korotaev <[EMAIL PROTECTED]>
Cc: Herbert Poetzl <[EMAIL PROTECTED]>
Cc: David Rientjes <[EMAIL PROTECTED]>
Cc: Vaidyanathan Srinivasan <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
mm/memcontrol.c | 24 +++++++++++++++++++++---
1 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c867612..975e899 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -83,7 +83,9 @@ struct page_cgroup {
struct mem_cgroup *mem_cgroup;
atomic_t ref_cnt; /* Helpful when pages move b/w */
/* mapped and cached states */
+ int flags;
};
+#define PAGE_CGROUP_FLAG_CACHE (0x1) /* charged as cache */
enum {
MEM_CGROUP_TYPE_UNSPEC = 0,
@@ -93,6 +95,11 @@ enum {
MEM_CGROUP_TYPE_MAX,
};
+enum charge_type {
+ MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
+ MEM_CGROUP_CHARGE_TYPE_MAPPED,
+};
+
static struct mem_cgroup init_mem_cgroup;
static inline
@@ -306,8 +313,8 @@ unsigned long mem_cgroup_isolate_pages(unsigned long
nr_to_scan,
* 0 if the charge was successful
* < 0 if the cgroup is over its limit
*/
-int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
- gfp_t gfp_mask)
+static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
+ gfp_t gfp_mask, enum charge_type ctype)
{
struct mem_cgroup *mem;
struct page_cgroup *pc;
@@ -409,6 +416,9 @@ noreclaim:
atomic_set(&pc->ref_cnt, 1);
pc->mem_cgroup = mem;
pc->page = page;
+ pc->flags = 0;
+ if (ctype == MEM_CGROUP_CHARGE_TYPE_CACHE)
+ pc->flags |= PAGE_CGROUP_FLAG_CACHE;
if (page_cgroup_assign_new_page_cgroup(page, pc)) {
/*
* an another charge is added to this page already.
@@ -433,6 +443,13 @@ err:
return -ENOMEM;
}
+int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
+ gfp_t gfp_mask)
+{
+ return mem_cgroup_charge_common(page, mm, gfp_mask,
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
+}
+
/*
* See if the cached pages should be charged at all?
*/
@@ -445,7 +462,8 @@ int mem_cgroup_cache_charge(struct page *page, struct
mm_struct *mm,
mem = rcu_dereference(mm->mem_cgroup);
if (mem->control_type == MEM_CGROUP_TYPE_ALL)
- return mem_cgroup_charge(page, mm, gfp_mask);
+ return mem_cgroup_charge_common(page, mm, gfp_mask,
+ MEM_CGROUP_CHARGE_TYPE_CACHE);
else
return 0;
}
-
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