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Subject: Re: [PATCH v3 11/14] mm: Combine first two unions in struct page
References: <20180418184912.2851-1-willy@infradead.org>
 <20180418184912.2851-12-willy@infradead.org>
From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <0666c9e6-9b62-c083-6d45-56d77a3943ea@suse.cz>
Date: Thu, 19 Apr 2018 16:03:54 +0200
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To: Matthew Wilcox <willy@infradead.org>, linux-mm@kvack.org
Cc: Matthew Wilcox <mawilcox@microsoft.com>, Andrew Morton <akpm@linux-foundation.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Christoph Lameter <cl@linux.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Pekka Enberg <penberg@kernel.org>

On 04/18/2018 08:49 PM, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@microsoft.com>
> 
> This gives us five words of space in a single union in struct page.
> The compound_mapcount moves position (from offset 24 to offset 20)
> on 64-bit systems, but that does not seem likely to cause any trouble.
> 
> Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>

Acked-by: Vlastimil Babka <vbabka@suse.cz>