Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753135AbXJVU3u (ORCPT ); Mon, 22 Oct 2007 16:29:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750843AbXJVU3n (ORCPT ); Mon, 22 Oct 2007 16:29:43 -0400 Received: from gate.crashing.org ([63.228.1.57]:41082 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750730AbXJVU3m (ORCPT ); Mon, 22 Oct 2007 16:29:42 -0400 Subject: Re: ARCH_FREE_PTE_NR 5350 on x86_64 From: Benjamin Herrenschmidt Reply-To: benh@kernel.crashing.org To: Hugh Dickins Cc: Nick Piggin , Alok kataria , Andi Kleen , Thomas Gleixner , linux-kernel@vger.kernel.org In-Reply-To: References: <35f686220710142354k66e1b9acwf65864b138ffd26@mail.gmail.com> <200710152236.24789.nickpiggin@yahoo.com.au> Content-Type: text/plain Date: Tue, 23 Oct 2007 06:29:18 +1000 Message-Id: <1193084958.6745.99.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.12.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1119 Lines: 28 > Agreed. No hurry, but thanks to Alok for reminding us. > CC'ing Ben since he's the one most active in mmu_gathering these days. > CC'ing Thomas lest he's puzzling over it in the x86 merge. Hrm... yes, that stuff sucks. I've had my work on mmu gather on hold since KS due to other priorities showing up, but I'll get back to it soon and put that on the todo list. The main pain here is the immap_lock. I have various plans to get rid of preemption blocking in the main mmu gather (the stuff we discussed already basically), but the immap_lock must stay, so we need to keep something akin to immap_lock. With the new approach, the disconnect between ZAP_BLOCK_SIZE and whatever we use to represent the size of a batch might still be relevant for the cases where we aren't holding that lock. I'll get back to that stuff soon and we can then discuss the details. Ben. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/