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Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c67
1 files changed, 61 insertions, 6 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index decace3bb57..7288e9d85ca 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -21,6 +21,7 @@
#include <linux/memcontrol.h>
#include <linux/cgroup.h>
#include <linux/mm.h>
+#include <linux/pagemap.h>
#include <linux/smp.h>
#include <linux/page-flags.h>
#include <linux/backing-dev.h>
@@ -139,6 +140,7 @@ enum charge_type {
MEM_CGROUP_CHARGE_TYPE_MAPPED,
MEM_CGROUP_CHARGE_TYPE_SHMEM, /* used by page migration of shmem */
MEM_CGROUP_CHARGE_TYPE_FORCE, /* used by force_empty */
+ MEM_CGROUP_CHARGE_TYPE_SWAPOUT, /* for accounting swapcache */
NR_CHARGE_TYPE,
};
@@ -780,6 +782,33 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL);
}
+#ifdef CONFIG_SWAP
+int mem_cgroup_cache_charge_swapin(struct page *page,
+ struct mm_struct *mm, gfp_t mask, bool locked)
+{
+ int ret = 0;
+
+ if (mem_cgroup_subsys.disabled)
+ return 0;
+ if (unlikely(!mm))
+ mm = &init_mm;
+ if (!locked)
+ lock_page(page);
+ /*
+ * If not locked, the page can be dropped from SwapCache until
+ * we reach here.
+ */
+ if (PageSwapCache(page)) {
+ ret = mem_cgroup_charge_common(page, mm, mask,
+ MEM_CGROUP_CHARGE_TYPE_SHMEM, NULL);
+ }
+ if (!locked)
+ unlock_page(page);
+
+ return ret;
+}
+#endif
+
void mem_cgroup_commit_charge_swapin(struct page *page, struct mem_cgroup *ptr)
{
struct page_cgroup *pc;
@@ -817,6 +846,9 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
if (mem_cgroup_subsys.disabled)
return;
+ if (PageSwapCache(page))
+ return;
+
/*
* Check if our page_cgroup is valid
*/
@@ -825,12 +857,26 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
return;
lock_page_cgroup(pc);
- if ((ctype == MEM_CGROUP_CHARGE_TYPE_MAPPED && page_mapped(page))
- || !PageCgroupUsed(pc)) {
- /* This happens at race in zap_pte_range() and do_swap_page()*/
- unlock_page_cgroup(pc);
- return;
+
+ if (!PageCgroupUsed(pc))
+ goto unlock_out;
+
+ switch (ctype) {
+ case MEM_CGROUP_CHARGE_TYPE_MAPPED:
+ if (page_mapped(page))
+ goto unlock_out;
+ break;
+ case MEM_CGROUP_CHARGE_TYPE_SWAPOUT:
+ if (!PageAnon(page)) { /* Shared memory */
+ if (page->mapping && !page_is_file_cache(page))
+ goto unlock_out;
+ } else if (page_mapped(page)) /* Anon */
+ goto unlock_out;
+ break;
+ default:
+ break;
}
+
ClearPageCgroupUsed(pc);
mem = pc->mem_cgroup;
@@ -844,6 +890,10 @@ __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
css_put(&mem->css);
return;
+
+unlock_out:
+ unlock_page_cgroup(pc);
+ return;
}
void mem_cgroup_uncharge_page(struct page *page)
@@ -863,6 +913,11 @@ void mem_cgroup_uncharge_cache_page(struct page *page)
__mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_CACHE);
}
+void mem_cgroup_uncharge_swapcache(struct page *page)
+{
+ __mem_cgroup_uncharge_common(page, MEM_CGROUP_CHARGE_TYPE_SWAPOUT);
+}
+
/*
* Before starting migration, account PAGE_SIZE to mem_cgroup that the old
* page belongs to.
@@ -920,7 +975,7 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
ctype = MEM_CGROUP_CHARGE_TYPE_SHMEM;
/* unused page is not on radix-tree now. */
- if (unused && ctype != MEM_CGROUP_CHARGE_TYPE_MAPPED)
+ if (unused)
__mem_cgroup_uncharge_common(unused, ctype);
pc = lookup_page_cgroup(target);