[PATCH 28 of 31] memcg compound

Andrea Arcangeli
2010-01-25T17:29:53Z

Teach memcg to charge/uncharge compound pages.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1401,8 +1401,8 @@ static int __cpuinit memcg_stock_cpu_cal
* oom-killer can be invoked.
*/
static int __mem_cgroup_try_charge(struct mm_struct *mm,
- gfp_t gfp_mask, struct mem_cgroup **memcg,
- bool oom, struct page *page)
+ gfp_t gfp_mask, struct mem_cgroup **memcg,
+ bool oom, struct page *page, int page_size)
{
struct mem_cgroup *mem, *mem_over_limit;
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
@@ -1415,6 +1415,9 @@ static int __mem_cgroup_try_charge(struc
return 0;
}

+ if (PageTransHuge(page))
+ csize = page_size;
+
/*
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the
@@ -1439,8 +1442,9 @@ static int __mem_cgroup_try_charge(struc
int ret = 0;
unsigned long flags = 0;

- if (consume_stock(mem))
- goto charged;
+ if (!PageTransHuge(page))
+ if (consume_stock(mem))
+ goto charged;

ret = res_counter_charge(&mem->res, csize, &fail_res);
if (likely(!ret)) {
@@ -1460,7 +1464,7 @@ static int __mem_cgroup_try_charge(struc
res);

/* reduce request size and retry */
- if (csize > PAGE_SIZE) {
+ if (csize > page_size) {
csize = PAGE_SIZE;
continue;
}
@@ -1491,7 +1495,7 @@ static int __mem_cgroup_try_charge(struc
goto nomem;
}
}
- if (csize > PAGE_SIZE)
+ if (csize > page_size)
refill_stock(mem, csize - PAGE_SIZE);
charged:
/*
@@ -1512,12 +1516,12 @@ nomem:
* This function is for that and do uncharge, put css's refcnt.
* gotten by try_charge().
*/
-static void mem_cgroup_cancel_charge(struct mem_cgroup *mem)
+static void mem_cgroup_cancel_charge(struct mem_cgroup *mem, int page_size)
{
if (!mem_cgroup_is_root(mem)) {
- res_counter_uncharge(&mem->res, PAGE_SIZE);
+ res_counter_uncharge(&mem->res, page_size);
if (do_swap_account)
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ res_counter_uncharge(&mem->memsw, page_size);
}
css_put(&mem->css);
}
@@ -1575,8 +1579,9 @@ struct mem_cgroup *try_get_mem_cgroup_fr
*/

static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
- struct page_cgroup *pc,
- enum charge_type ctype)
+ struct page_cgroup *pc,
+ enum charge_type ctype,
+ int page_size)
{
/* try_charge() can return NULL to *memcg, taking care of it. */
if (!mem)
@@ -1585,7 +1590,7 @@ static void __mem_cgroup_commit_charge(s
lock_page_cgroup(pc);
if (unlikely(PageCgroupUsed(pc))) {
unlock_page_cgroup(pc);
- mem_cgroup_cancel_charge(mem);
+ mem_cgroup_cancel_charge(mem, page_size);
return;
}

@@ -1722,7 +1727,8 @@ static int mem_cgroup_move_parent(struct
goto put;

parent = mem_cgroup_from_cont(pcg);
- ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, page);
+ ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, page,
+ PAGE_SIZE);
if (ret || !parent)
goto put_back;

@@ -1730,7 +1736,7 @@ static int mem_cgroup_move_parent(struct
if (!ret)
css_put(&parent->css); /* drop extra refcnt by try_charge() */
else
- mem_cgroup_cancel_charge(parent); /* does css_put */
+ mem_cgroup_cancel_charge(parent, PAGE_SIZE); /* does css_put */
put_back:
putback_lru_page(page);
put:
@@ -1752,6 +1758,10 @@ static int mem_cgroup_charge_common(stru
struct mem_cgroup *mem;
struct page_cgroup *pc;
int ret;
+ int page_size = PAGE_SIZE;
+
+ if (PageTransHuge(page))
+ page_size <<= compound_order(page);

pc = lookup_page_cgroup(page);
/* can happen at boot */
@@ -1760,11 +1770,12 @@ static int mem_cgroup_charge_common(stru
prefetchw(pc);

mem = memcg;
- ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true, page);
+ ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true, page,
+ page_size);
if (ret || !mem)
return ret;

- __mem_cgroup_commit_charge(mem, pc, ctype);
+ __mem_cgroup_commit_charge(mem, pc, ctype, page_size);
return 0;
}

@@ -1773,8 +1784,6 @@ int mem_cgroup_newpage_charge(struct pag
{
if (mem_cgroup_disabled())
return 0;
- if (PageCompound(page))
- return 0;
/*
* If already mapped, we don't have to account.
* If page cache, page->mapping has address_space.
@@ -1787,7 +1796,7 @@ int mem_cgroup_newpage_charge(struct pag
if (unlikely(!mm))
mm = &init_mm;
return mem_cgroup_charge_common(page, mm, gfp_mask,
- MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
+ MEM_CGROUP_CHARGE_TYPE_MAPPED, NULL);
}

static void
@@ -1880,14 +1889,14 @@ int mem_cgroup_try_charge_swapin(struct
if (!mem)
goto charge_cur_mm;
*ptr = mem;
- ret = __mem_cgroup_try_charge(NULL, mask, ptr, true, page);
+ ret = __mem_cgroup_try_charge(NULL, mask, ptr, true, page, PAGE_SIZE);
/* drop extra refcnt from tryget */
css_put(&mem->css);
return ret;
charge_cur_mm:
if (unlikely(!mm))
mm = &init_mm;
- return __mem_cgroup_try_charge(mm, mask, ptr, true, page);
+ return __mem_cgroup_try_charge(mm, mask, ptr, true, page, PAGE_SIZE);
}

static void
@@ -1903,7 +1912,7 @@ __mem_cgroup_commit_charge_swapin(struct
cgroup_exclude_rmdir(&ptr->css);
pc = lookup_page_cgroup(page);
mem_cgroup_lru_del_before_commit_swapcache(page);
- __mem_cgroup_commit_charge(ptr, pc, ctype);
+ __mem_cgroup_commit_charge(ptr, pc, ctype, PAGE_SIZE);
mem_cgroup_lru_add_after_commit_swapcache(page);
/*
* Now swap is on-memory. This means this page may be
@@ -1952,11 +1961,12 @@ void mem_cgroup_cancel_charge_swapin(str
return;
if (!mem)
return;
- mem_cgroup_cancel_charge(mem);
+ mem_cgroup_cancel_charge(mem, PAGE_SIZE);
}

static void
-__do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype)
+__do_uncharge(struct mem_cgroup *mem, const enum charge_type ctype,
+ int page_size)
{
struct memcg_batch_info *batch = NULL;
bool uncharge_memsw = true;
@@ -1989,14 +1999,14 @@ __do_uncharge(struct mem_cgroup *mem, co
if (batch->memcg != mem)
goto direct_uncharge;
/* remember freed charge and uncharge it later */
- batch->bytes += PAGE_SIZE;
+ batch->bytes += page_size;
if (uncharge_memsw)
- batch->memsw_bytes += PAGE_SIZE;
+ batch->memsw_bytes += page_size;
return;
direct_uncharge:
- res_counter_uncharge(&mem->res, PAGE_SIZE);
+ res_counter_uncharge(&mem->res, page_size);
if (uncharge_memsw)
- res_counter_uncharge(&mem->memsw, PAGE_SIZE);
+ res_counter_uncharge(&mem->memsw, page_size);
return;
}

@@ -2009,6 +2019,10 @@ __mem_cgroup_uncharge_common(struct page
struct page_cgroup *pc;
struct mem_cgroup *mem = NULL;
struct mem_cgroup_per_zone *mz;
+ int page_size = PAGE_SIZE;
+
+ if (PageTransHuge(page))
+ page_size <<= compound_order(page);

if (mem_cgroup_disabled())
return NULL;
@@ -2048,7 +2062,7 @@ __mem_cgroup_uncharge_common(struct page
}

if (!mem_cgroup_is_root(mem))
- __do_uncharge(mem, ctype);
+ __do_uncharge(mem, ctype, page_size);
if (ctype == MEM_CGROUP_CHARGE_TYPE_SWAPOUT)
mem_cgroup_swap_statistics(mem, true);
mem_cgroup_charge_statistics(mem, pc, false);
@@ -2217,7 +2231,7 @@ int mem_cgroup_prepare_migration(struct

if (mem) {
ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false,
- page);
+ page, PAGE_SIZE);
css_put(&mem->css);
}
*ptr = mem;
@@ -2260,7 +2274,7 @@ void mem_cgroup_end_migration(struct mem
* __mem_cgroup_commit_charge() check PCG_USED bit of page_cgroup.
* So, double-counting is effectively avoided.
*/
- __mem_cgroup_commit_charge(mem, pc, ctype);
+ __mem_cgroup_commit_charge(mem, pc, ctype, PAGE_SIZE);

/*
* Both of oldpage and newpage are still under lock_page().