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authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2009-04-03 03:57:48 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-03 06:04:56 +0400
commit83aae4c737866da3280f51fd15da58eddd788397 (patch)
treea4fdabfb02949e0d44743850b7f37ae52eaed757 /mm/memcontrol.c
parent627991a20b3f4d504d20466ab405fe035cb1a20a (diff)
downloadlinux-83aae4c737866da3280f51fd15da58eddd788397.tar.xz
memcg: cleanup cache_charge
Current mem_cgroup_cache_charge is a bit complicated especially in the case of shmem's swap-in. This patch cleans it up by using try_charge_swapin and commit_charge_swapin. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c60
1 files changed, 23 insertions, 37 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 55dea5968464..2fc6d6c48238 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1238,6 +1238,10 @@ int mem_cgroup_newpage_charge(struct page *page,
MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
}
+static void
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+ enum charge_type ctype);
+
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
@@ -1274,16 +1278,6 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
unlock_page_cgroup(pc);
}
- if (do_swap_account && PageSwapCache(page)) {
- mem = try_get_mem_cgroup_from_swapcache(page);
- if (mem)
- mm = NULL;
- else
- mem = NULL;
- /* SwapCache may be still linked to LRU now. */
- mem_cgroup_lru_del_before_commit_swapcache(page);
- }
-
if (unlikely(!mm && !mem))
mm = &init_mm;
@@ -1291,32 +1285,16 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
return mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_CACHE, NULL);
- ret = mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
- if (mem)
- css_put(&mem->css);
- if (PageSwapCache(page))
- mem_cgroup_lru_add_after_commit_swapcache(page);
+ /* shmem */
+ if (PageSwapCache(page)) {
+ ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
+ if (!ret)
+ __mem_cgroup_commit_charge_swapin(page, mem,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM);
+ } else
+ ret = mem_cgroup_charge_common(page, mm, gfp_mask,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM, mem);
- if (do_swap_account && !ret && PageSwapCache(page)) {
- swp_entry_t ent = {.val = page_private(page)};
- unsigned short id;
- /* avoid double counting */
- id = swap_cgroup_record(ent, 0);
- rcu_read_lock();
- mem = mem_cgroup_lookup(id);
- if (mem) {
- /*
- * We did swap-in. Then, this entry is doubly counted
- * both in mem and memsw. We uncharge it, here.
- * Recorded ID can be obsolete. We avoid calling
- * css_tryget()
- */
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
- mem_cgroup_put(mem);
- }
- rcu_read_unlock();
- }
return ret;
}
@@ -1359,7 +1337,9 @@ charge_cur_mm:
return __mem_cgroup_try_charge(mm, mask, ptr, true);
}
-void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+static void
+__mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr,
+ enum charge_type ctype)
{
struct page_cgroup *pc;
@@ -1369,7 +1349,7 @@ void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
return;
pc = lookup_page_cgroup(page);
mem_cgroup_lru_del_before_commit_swapcache(page);
- __mem_cgroup_commit_charge(ptr, pc, MEM_CGROUP_CHARGE_TYPE_MAPPED);
+ __mem_cgroup_commit_charge(ptr, pc, ctype);
mem_cgroup_lru_add_after_commit_swapcache(page);
/*
* Now swap is on-memory. This means this page may be
@@ -1400,6 +1380,12 @@ void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
}
+void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
+{
+ __mem_cgroup_commit_charge_swapin(page, ptr,
+ MEM_CGROUP_CHARGE_TYPE_MAPPED);
+}
+
void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *mem)
{
if (mem_cgroup_disabled())