From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx176.postini.com [74.125.245.176]) by kanga.kvack.org (Postfix) with SMTP id 46A2D6B0037 for ; Mon, 18 Mar 2013 06:53:03 -0400 (EDT) Date: Mon, 18 Mar 2013 11:52:57 +0100 From: Michal Hocko Subject: Re: [PATCH 2/2] Drivers: hv: balloon: Support 2M page allocations for ballooning Message-ID: <20130318105257.GG10192@dhcp22.suse.cz> References: <1363470088-24565-1-git-send-email-kys@microsoft.com> <1363470125-24606-1-git-send-email-kys@microsoft.com> <1363470125-24606-2-git-send-email-kys@microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1363470125-24606-2-git-send-email-kys@microsoft.com> Sender: owner-linux-mm@kvack.org List-ID: To: "K. Y. Srinivasan" Cc: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com, andi@firstfloor.org, akpm@linux-foundation.org, linux-mm@kvack.org, kamezawa.hiroyuki@gmail.com, hannes@cmpxchg.org, yinghan@google.com On Sat 16-03-13 14:42:05, K. Y. Srinivasan wrote: > While ballooning memory out of the guest, attempt 2M allocations first. > If 2M allocations fail, then go for 4K allocations. In cases where we > have performed 2M allocations, split this 2M page so that we can free this > page at 4K granularity (when the host returns the memory). Maybe I am missing something but what is the advantage of 2M allocation when you split it up immediately so you are not using it as a huge page? [...] -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org