linux-kernel - Re: [PATCH V2 0/5] Huge pages for short descriptors on ARM

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Date:	Thu, 24 Apr 2014 11:36:39 +0100
From:	Will Deacon <will.deacon@....com>
To:	Steve Capper <steve.capper@...aro.org>
Cc:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"robherring2@...il.com" <robherring2@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"gerald.schaefer@...ibm.com" <gerald.schaefer@...ibm.com>
Subject: Re: [PATCH V2 0/5] Huge pages for short descriptors on ARM

Hi Steve,

On Thu, Apr 24, 2014 at 11:22:29AM +0100, Steve Capper wrote:
> On Wed, Apr 16, 2014 at 12:46:38PM +0100, Steve Capper wrote:
> Just a ping on this...
> 
> I would really like to get huge page support for short descriptors on
> ARM merged as I've been carrying around these patches for a long time.
> 
> Recently I've had no issues raised about the code. The patches have
> been tested and found to be both beneficial to system performance and
> stable.
> 
> There are two parts to the series, the first patch is a core mm/ patch
> that introduces some huge_pte_ helper functions that allows for a much
> simpler ARM (without LPAE) implementation. The second part is the
> actual arch/arm code.
> 
> I'm not sure how to proceed with these patches. I was thinking that
> they could be picked up into linux-next? If that sounds reasonable;
> Andrew, would you like to take the mm/ patch and Russell could you
> please take the arch/arm patches?
> 
> Also, I was hoping to get these into 3.16. Are there any objections to
> that?

Who is asking for this code? We already support hugepages for LPAE systems,
so this would be targetting what? A9? I'm reluctant to add ~400 lines of
subtle, low-level mm code to arch/arm/ if it doesn't have any active users.

I guess I'm after some commitment that this is (a) useful to somebody and
(b) going to be tested regularly, otherwise it will go the way of things
like big-endian, where we end up carrying around code which is broken more
often than not (although big-endian is more self-contained).

Will
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