linux-kernel - Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM

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Message-ID: <1350956664.2728.19.camel@pasglop>
Date:	Tue, 23 Oct 2012 12:44:24 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	mtk.manpages@...il.com
Cc:	Andi Kleen <ak@...ux.intel.com>, Andi Kleen <andi@...stfloor.org>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Hillf Danton <dhillf@...il.com>
Subject: Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM_HUGETLB
 v6

On Mon, 2012-10-22 at 17:53 +0200, Michael Kerrisk (man-pages) wrote:

> This is all seems to make an awful muck of the API...

 .../...

> There seems to be a reasonable argument here for an mmap3() with a
> 64-bit flags argument...

I tend to agree. There's a similar issue happening when we try to shovel
things into protection bits, like we do with SAO (strong access
ordering) and want to do with per-page endian on embedded.

It think we need a pile of additional flag space.

Cheers,
Ben.

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