Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754996AbaKRTLO (ORCPT ); Tue, 18 Nov 2014 14:11:14 -0500 Received: from pandora.arm.linux.org.uk ([78.32.30.218]:54159 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754420AbaKRTLM (ORCPT ); Tue, 18 Nov 2014 14:11:12 -0500 Date: Tue, 18 Nov 2014 19:11:04 +0000 From: Russell King - ARM Linux To: Catalin Marinas Cc: Konstantin Khlebnikov , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: Re: [PATCH RFC 3/3] ARM: reduce size of page table directory for short mode Message-ID: <20141118191104.GD4042@n2100.arm.linux.org.uk> References: <20141118165313.9958.1242.stgit@buzz> <20141118165325.9958.84370.stgit@buzz> <20141118181412.GO28279@e104818-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141118181412.GO28279@e104818-lin.cambridge.arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 18, 2014 at 06:14:12PM +0000, Catalin Marinas wrote: > Actually, with LPAE you can save a pmd and pte allocated for the vectors > page at 0xffff0000. So you can save 8K per task here. Similarly with the > classic MMU, you can save another 4K for the vectors page pte. No. For any CPU which has high vectors (approximately ARMv5 and up), there is no "vectors page pte". The vectors page PTE is only allocated when we need low vectors. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net. -- 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/