[PATCHv4 05/39] memcg, thp: charge huge cache pages

[Kirill A. Shutemov]

From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>

mem_cgroup_cache_charge() has check for PageCompound(). The check
prevents charging huge cache pages.

I don't see a reason why the check is present. Looks like it's just
legacy (introduced in 52d4b9a memcg: allocate all page_cgroup at boot).

Let's just drop it.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
 mm/memcontrol.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fe4f123..a7de6a7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4080,8 +4080,6 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
 
 	if (mem_cgroup_disabled())
 		return 0;
-	if (PageCompound(page))
-		return 0;
 
 	if (!PageSwapCache(page))
 		ret = mem_cgroup_charge_common(page, mm, gfp_mask, type);
-- 
1.7.10.4

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