From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53348) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZPBtz-0001PK-TC for qemu-devel@nongnu.org; Tue, 11 Aug 2015 11:55:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZPBtw-00028x-5j for qemu-devel@nongnu.org; Tue, 11 Aug 2015 11:55:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55409) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZPBtv-00028p-GN for qemu-devel@nongnu.org; Tue, 11 Aug 2015 11:55:43 -0400 References: <1438966995-5913-1-git-send-email-a.rigo@virtualopensystems.com> <1438966995-5913-2-git-send-email-a.rigo@virtualopensystems.com> <55C9FE29.2080204@redhat.com> From: Paolo Bonzini Message-ID: <55CA1AF8.1090409@redhat.com> Date: Tue, 11 Aug 2015 17:55:36 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC v4 1/9] exec.c: Add new exclusive bitmap to ram_list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: alvise rigo Cc: mttcg@greensocs.com, Claudio Fontana , QEMU Developers , Jani Kokkonen , VirtualOpenSystems Technical Team , =?UTF-8?Q?Alex_Benn=c3=a9e?= On 11/08/2015 17:54, alvise rigo wrote: > This can lead to an excessive rate of flush requests, since for one > CPU that removes the TLB_EXCL flag, all the others that are competing > for the same excl address will need to flush the entire cache and > start all over again. Why flush the entire cache (I understand you mean TLB)? Paolo > If for a start we want to have a simpler implementation, I can revert > back to the one-bit design.