linux-kernel - Moving more kernel data into highmem?

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Message-ID: <55D910BD.7090508@gmail.com>
Date:	Sat, 22 Aug 2015 17:15:57 -0700
From:	Raymond Jennings <shentino@...il.com>
To:	Linux kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...r.kernel.org
Subject: Moving more kernel data into highmem?

Hey, I remembered that there's an option to put third level page tables 
in highmem.

This might be a stupid question, but is there a way to move more kernel 
data into highmem?

For example, page directories, first level page tables?

I even remember a few articles on lwn about how much space is taken up 
by struct page.

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