From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta7.messagelabs.com (mail6.bemta7.messagelabs.com [216.82.255.55]) by kanga.kvack.org (Postfix) with ESMTP id 2788D6B0169 for ; Fri, 29 Jul 2011 19:18:40 -0400 (EDT) From: Andi Kleen Subject: Re: [GIT PULL] Lockless SLUB slowpaths for v3.1-rc1 References: Date: Fri, 29 Jul 2011 16:18:37 -0700 In-Reply-To: (Christoph Lameter's message of "Fri, 29 Jul 2011 10:04:36 -0500 (CDT)") Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Pekka Enberg , torvalds@linux-foundation.org, akpm@linux-foundation.org, rientjes@google.com, hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Christoph Lameter writes: > On Fri, 29 Jul 2011, Pekka Enberg wrote: > >> We haven't come up with a solution to keep struct page size the same but I >> think it's a reasonable trade-off. > > The change requires the page struct to be aligned to a double word > boundary. Why is that? > There is actually no variable added to the page struct. Its just > the alignment requirement that causes padding to be added after each page > struct. These days with everyone using cgroups (and likely mcgroups too) you could probably put the cgroups page pointer back there. It's currently external. -Andi -- ak@linux.intel.com -- Speaking for myself only -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org