linux-kernel - Re: [PATCH 00/38] mm: remove non-linear mess

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Message-ID: <20141226211055.GM17430@saruman>
Date:	Fri, 26 Dec 2014 15:10:55 -0600
From:	Felipe Balbi <balbi@...com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	<akpm@...ux-foundation.org>, <peterz@...radead.org>,
	<mingo@...nel.org>, <davej@...hat.com>, <sasha.levin@...cle.com>,
	<hughd@...gle.com>, <linux-mm@...ck.org>,
	<linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/38] mm: remove non-linear mess

On Wed, Dec 24, 2014 at 02:22:08PM +0200, Kirill A. Shutemov wrote:
> We have remap_file_pages(2) emulation in -mm tree for few release cycles
> and we plan to have it mainline in v3.20. This patchset removes rest of
> VM_NONLINEAR infrastructure.
> 
> Patches 1-8 take care about generic code. They are pretty
> straight-forward and can be applied without other of patches.
> 
> Rest patches removes pte_file()-related stuff from architecture-specific
> code. It usually frees up one bit in non-present pte. I've tried to reuse
> that bit for swap offset, where I was able to figure out how to do that.
> 
> For obvious reason I cannot test all that arch-specific code and would
> like to see acks from maintainers.
> 
> In total, remap_file_pages(2) required about 1.4K lines of not-so-trivial
> kernel code. That's too much for functionality nobody uses.
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git remap_file_pages

have been running this for a while on a three different ARM boards I
have around, haven't noticed anything wrong.

Tested-by: Felipe Balbi <balbi@...com>

-- 
balbi

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