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Subject[v6 PATCH 2/4] mm: move mem_cgroup_uncharge out of __page_cache_release()
Date
The later patch would make THP deferred split shrinker memcg aware, but
it needs page->mem_cgroup information in THP destructor, which is called
after mem_cgroup_uncharge() now.

So, move mem_cgroup_uncharge() from __page_cache_release() to compound
page destructor, which is called by both THP and other compound pages
except HugeTLB. And call it in __put_single_page() for single order
page.

Suggested-by: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Qian Cai <cai@lca.pw>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
---
mm/page_alloc.c | 1 +
mm/swap.c | 2 +-
mm/vmscan.c | 6 ++----
3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df02a88..1d1c5d3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -670,6 +670,7 @@ static void bad_page(struct page *page, const char *reason,

void free_compound_page(struct page *page)
{
+ mem_cgroup_uncharge(page);
__free_pages_ok(page, compound_order(page));
}

diff --git a/mm/swap.c b/mm/swap.c
index ae30039..d4242c8 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -71,12 +71,12 @@ static void __page_cache_release(struct page *page)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
}
__ClearPageWaiters(page);
- mem_cgroup_uncharge(page);
}

static void __put_single_page(struct page *page)
{
__page_cache_release(page);
+ mem_cgroup_uncharge(page);
free_unref_page(page);
}

diff --git a/mm/vmscan.c b/mm/vmscan.c
index dbdc46a..b1b5e5f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1490,10 +1490,9 @@ static unsigned long shrink_page_list(struct list_head *page_list,
* Is there need to periodically free_page_list? It would
* appear not as the counts should be low
*/
- if (unlikely(PageTransHuge(page))) {
- mem_cgroup_uncharge(page);
+ if (unlikely(PageTransHuge(page)))
(*get_compound_page_dtor(page))(page);
- } else
+ else
list_add(&page->lru, &free_pages);
continue;

@@ -1914,7 +1913,6 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,

if (unlikely(PageCompound(page))) {
spin_unlock_irq(&pgdat->lru_lock);
- mem_cgroup_uncharge(page);
(*get_compound_page_dtor(page))(page);
spin_lock_irq(&pgdat->lru_lock);
} else
--
1.8.3.1
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