linux-kernel - RE: [RFC][PATCH] Cross Memory Attach

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Message-ID: <SNT125-W50374AE4BF6FD350810298C37D0@phx.gbl>
Date:	Sat, 18 Sep 2010 21:55:30 -0700
From:	Yuhong Bao <yuhongbao_386@...mail.com>
To:	<torvalds@...ux-foundation.org>, <peterz@...radead.org>
CC:	<cyeoh@....ibm.com>, <linux-kernel@...r.kernel.org>
Subject: RE: [RFC][PATCH] Cross Memory Attach


> Of course, these days I would seriously suggest against trying to
> optimize the kmap() case. It only matters on crap hardware these days.
> Anybody running HIGHMEM in 2010 and thinks that it makes sense
> deserves the pain the get. We should not complicate the kernel further
> for it, and sane architectures will have a no-op kmap().

Well, keep in mind most even vaguely recent 32-bit x86 distro kernels
have HIGHMEM4G enabled by default.
Some recent ones even have HIGHMEM64G enabled in order to get NX support.
(And yes, as I said before, there are many processors that cannot run in long mode
but have NX)

Yuhong Bao
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