From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55535) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gZddJ-0005lr-3l for qemu-devel@nongnu.org; Wed, 19 Dec 2018 10:19:38 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gZddH-00040w-N5 for qemu-devel@nongnu.org; Wed, 19 Dec 2018 10:19:36 -0500 Received: from mx1.redhat.com ([209.132.183.28]:44098) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gZddH-000402-Ds for qemu-devel@nongnu.org; Wed, 19 Dec 2018 10:19:35 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5BC346CE for ; Wed, 19 Dec 2018 15:19:34 +0000 (UTC) Received: from donizetti.redhat.com (ovpn-112-76.ams2.redhat.com [10.36.112.76]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9F7B217197 for ; Wed, 19 Dec 2018 15:19:33 +0000 (UTC) From: Paolo Bonzini Date: Wed, 19 Dec 2018 16:18:51 +0100 Message-Id: <20181219151917.3874-10-pbonzini@redhat.com> In-Reply-To: <20181219151917.3874-1-pbonzini@redhat.com> References: <20181219151917.3874-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PULL 09/35] memory: avoid unnecessary coalesced_io_del operations List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 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; }; =20 #define FOR_EACH_FLAT_RANGE(var, view) \ @@ -650,6 +651,7 @@ static void render_memory_region(FlatView *view, fr.romd_mode =3D mr->romd_mode; fr.readonly =3D readonly; fr.nonvolatile =3D nonvolatile; + fr.has_coalesced_range =3D false; =20 /* Render the region itself into any gaps left by the current view. = */ for (i =3D 0; i < view->nr && int128_nz(remain); ++i) { @@ -852,6 +854,10 @@ static void address_space_update_ioeventfds(AddressS= pace *as) =20 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 *f= r, AddressSpace *as) CoalescedMemoryRange *cmr; AddrRange tmp; =20 + if (QTAILQ_EMPTY(&mr->coalesced)) { + return; + } + + fr->has_coalesced_range =3D true; QTAILQ_FOREACH(cmr, &mr->coalesced, link) { tmp =3D addrrange_shift(cmr->addr, int128_sub(fr->addr.start, --=20 2.20.1