linux-kernel - Re: [PATCH] register MADV

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Message-ID: <20100117110847.GA32212@infradead.org>
Date:	Sun, 17 Jan 2010 06:08:47 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	davem@...emloft.net
Subject: Re: [PATCH] register MADV_HUGEPAGE

On Sat, Jan 16, 2010 at 07:46:42PM +0100, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> In order to allow early shipping transparent hugepage feature enabled
> only inside MADV_HUGEPAGE and not globally to diminish the risk of
> unexpected performance regressions on non-hypervisor related usages
> I'd need this little define registered. This is also to avoid things
> like this:

NACK, usespace ABIs only go in when features are added.  There's a more
than large enough chance that it will change for one reason or another.

And while transparent hugepages are a good feature to add, it's still in
a far to early stage to go on with it.

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