linux-kernel - Re: [PATCHv4 05/39] memcg, thp: charge huge cache pages

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Date:	Tue, 21 May 2013 12:04:54 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCHv4 05/39] memcg, thp: charge huge cache pages

On 05/11/2013 06:23 PM, Kirill A. Shutemov wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> 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).

FWIW, that commit introduced two PageCompound() checks.  The other one
went away inexplicably in 01b1ae63c22.

Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>
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