From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751852Ab0AQLIz (ORCPT ); Sun, 17 Jan 2010 06:08:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751313Ab0AQLIy (ORCPT ); Sun, 17 Jan 2010 06:08:54 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:34061 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932080Ab0AQLIx (ORCPT ); Sun, 17 Jan 2010 06:08:53 -0500 Date: Sun, 17 Jan 2010 06:08:47 -0500 From: Christoph Hellwig To: Andrea Arcangeli Cc: Andrew Morton , linux-kernel@vger.kernel.org, linux-mm@kvack.org, davem@davemloft.net Subject: Re: [PATCH] register MADV_HUGEPAGE Message-ID: <20100117110847.GA32212@infradead.org> References: <20100116184642.GA5687@random.random> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100116184642.GA5687@random.random> User-Agent: Mutt/1.5.19 (2009-01-05) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Jan 16, 2010 at 07:46:42PM +0100, Andrea Arcangeli wrote: > From: Andrea Arcangeli > > 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.