From patchwork Mon Dec 17 23:16:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 10734499 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4FC066C5 for ; Mon, 17 Dec 2018 23:30:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 40ED42A45D for ; Mon, 17 Dec 2018 23:30:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 350222A48B; Mon, 17 Dec 2018 23:30:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C71142A45D for ; Mon, 17 Dec 2018 23:30:28 +0000 (UTC) Received: from localhost ([::1]:50518 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gZ2LD-0002Sq-Vk for patchwork-qemu-devel@patchwork.kernel.org; Mon, 17 Dec 2018 18:30:28 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43119) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gZ28h-0000Nh-6d for qemu-devel@nongnu.org; Mon, 17 Dec 2018 18:17:32 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gZ28a-0003Il-Rf for qemu-devel@nongnu.org; Mon, 17 Dec 2018 18:17:29 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39198) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gZ28a-0003IM-Ji for qemu-devel@nongnu.org; Mon, 17 Dec 2018 18:17:24 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E2BF942BC3 for ; Mon, 17 Dec 2018 23:17:23 +0000 (UTC) Received: from donizetti.redhat.com (unknown [10.36.112.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id 10A925D9C8 for ; Mon, 17 Dec 2018 23:17:22 +0000 (UTC) From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Tue, 18 Dec 2018 00:16:34 +0100 Message-Id: <20181217231700.24482-10-pbonzini@redhat.com> In-Reply-To: <20181217231700.24482-1-pbonzini@redhat.com> References: <20181217231700.24482-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Mon, 17 Dec 2018 23:17:23 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 09/35] memory: avoid unnecessary coalesced_io_del operations X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Store whether the FlatRange has had any coalesced I/O ranges applied, and if not avoid calling coalesced_io_del. This is useful in preparation for the next patch, which will call coalesced_io_del when rendering memory regions. Signed-off-by: Paolo Bonzini --- memory.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/memory.c b/memory.c index 119b6e46d5..072769aa06 100644 --- a/memory.c +++ b/memory.c @@ -217,6 +217,7 @@ struct FlatRange { bool romd_mode; bool readonly; bool nonvolatile; + bool has_coalesced_range; }; #define FOR_EACH_FLAT_RANGE(var, view) \ @@ -650,6 +651,7 @@ static void render_memory_region(FlatView *view, fr.romd_mode = mr->romd_mode; fr.readonly = readonly; fr.nonvolatile = nonvolatile; + fr.has_coalesced_range = false; /* Render the region itself into any gaps left by the current view. */ for (i = 0; i < view->nr && int128_nz(remain); ++i) { @@ -852,6 +854,10 @@ static void address_space_update_ioeventfds(AddressSpace *as) static void flat_range_coalesced_io_del(FlatRange *fr, AddressSpace *as) { + if (!fr->has_coalesced_range) { + return; + } + MEMORY_LISTENER_UPDATE_REGION(fr, as, Reverse, coalesced_io_del, int128_get64(fr->addr.start), int128_get64(fr->addr.size)); @@ -863,6 +869,11 @@ static void flat_range_coalesced_io_add(FlatRange *fr, AddressSpace *as) CoalescedMemoryRange *cmr; AddrRange tmp; + if (QTAILQ_EMPTY(&mr->coalesced)) { + return; + } + + fr->has_coalesced_range = true; QTAILQ_FOREACH(cmr, &mr->coalesced, link) { tmp = addrrange_shift(cmr->addr, int128_sub(fr->addr.start,