From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:50489) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QwAQs-0005K7-HR for qemu-devel@nongnu.org; Wed, 24 Aug 2011 06:11:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QwAQk-0006EV-Mf for qemu-devel@nongnu.org; Wed, 24 Aug 2011 06:11:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47041) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QwAQj-0006Dl-Te for qemu-devel@nongnu.org; Wed, 24 Aug 2011 06:11:30 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id p7OABTNM011333 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Wed, 24 Aug 2011 06:11:29 -0400 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id p7OABSDq020852 for ; Wed, 24 Aug 2011 06:11:28 -0400 From: Avi Kivity Date: Wed, 24 Aug 2011 13:11:13 +0300 Message-Id: <1314180683-8227-15-git-send-email-avi@redhat.com> In-Reply-To: <1314180683-8227-1-git-send-email-avi@redhat.com> References: <1314180683-8227-1-git-send-email-avi@redhat.com> Subject: [Qemu-devel] [PATCH 14/24] piix_pci: wrap memory update in a transaction List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org The code will remap all PAMs, even if just one is updated, resulting in reduced performance. Wrap in a transaction to detect that those other PAMs have not changed. Signed-off-by: Avi Kivity --- hw/piix_pci.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/hw/piix_pci.c b/hw/piix_pci.c index f892994..8f6ea42 100644 --- a/hw/piix_pci.c +++ b/hw/piix_pci.c @@ -142,6 +142,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d) int i, r; uint32_t smram; + memory_region_transaction_begin(); update_pam(d, 0xf0000, 0x100000, (d->dev.config[I440FX_PAM] >> 4) & 3, &d->pam_regions[0]); for(i = 0; i < 12; i++) { @@ -162,6 +163,7 @@ static void i440fx_update_memory_mappings(PCII440FXState *d) d->smram_enabled = false; } } + memory_region_transaction_commit(); } static void i440fx_set_smm(int val, void *arg) -- 1.7.5.3