Re: [PATCH] mm: get pfn by page_to_pfn() instead of save in page->private

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To: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: Re: [PATCH] mm: get pfn by page_to_pfn() instead of save in page->private
From: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 18 Oct 2018 14:39:17 +0100
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, mhocko@xxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <20181018130429.37837-1-richard.weiyang@gmail.com>
References: <20181018130429.37837-1-richard.weiyang@gmail.com>
User-agent: Mutt/1.10.1 (2018-07-13)

On Thu, Oct 18, 2018 at 09:04:29PM +0800, Wei Yang wrote:
> This is not necessary to save the pfn to page->private.
> 
> The pfn could be retrieved by page_to_pfn() directly.
> 
> Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>

page_to_pfn is not free which is why it's cached.

-- 
Mel Gorman
SUSE Labs

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  - From: Wei Yang

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