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

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Message-ID: <20121022162929.GN2095@tassilo.jf.intel.com>
Date:	Mon, 22 Oct 2012 09:29:29 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:	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

> Since PowerPC already allows 16GB page sizes, doesn't there need to be
> allowance for the possibility of future expansion? Choosing a larger
> minimum size (like 2^16) would allow that. Does the minimum size need
> to be 16k? (Surely, if you want a HUGEPAGE, you want a bigger page
> than that? I am not sure.)

Some architectures have configurable huge page sizes, so it depends on
the user. I thought 16K is reasonable.  Can make it larger too. 

But I personally consider even 16GB pages somewhat too big.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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