linux-kernel - Re: [PATCH 1/2] mm: free compound page with correct order

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Message-ID: <20141015091341.GB12538@node.dhcp.inet.fi>
Date:	Wed, 15 Oct 2014 12:13:41 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Yu Zhao <yuzhao@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Hugh Dickins <hughd@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Bob Liu <lliubbo@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: free compound page with correct order

On Tue, Oct 14, 2014 at 01:16:39PM -0700, Yu Zhao wrote:
> Compound page should be freed by put_page() or free_pages() with
> correct order. Not doing so with causing the tail pages leaked.
> 
> The compound order can be obtained by compound_order() or use
> HPAGE_PMD_ORDER in our case. Some people would argue the latter
> is faster but I prefer the former which is more general.
> 
> Signed-off-by: Yu Zhao <yuzhao@...gle.com>

Urghh.. Sorry about that.

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Fixes: 97ae17497e99 ("thp: implement refcounting for huge zero page")
Cc: stable@...r.kernel.org # v3.8+

-- 
 Kirill A. Shutemov
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