From patchwork Tue Mar 27 05:56:13 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhiyong Wu X-Patchwork-Id: 148862 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 8AA7AB6EF3 for ; Tue, 27 Mar 2012 16:57:03 +1100 (EST) Received: from localhost ([::1]:48125 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SCPOu-0004qG-Rl for incoming@patchwork.ozlabs.org; Tue, 27 Mar 2012 01:57:00 -0400 Received: from eggs.gnu.org ([208.118.235.92]:50963) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SCPOj-0004ns-9a for qemu-devel@nongnu.org; Tue, 27 Mar 2012 01:56:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SCPOg-0001rL-Tj for qemu-devel@nongnu.org; Tue, 27 Mar 2012 01:56:48 -0400 Received: from e32.co.us.ibm.com ([32.97.110.150]:44994) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SCPOg-0001qu-N9 for qemu-devel@nongnu.org; Tue, 27 Mar 2012 01:56:46 -0400 Received: from /spool/local by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 26 Mar 2012 23:56:43 -0600 Received: from d03dlp02.boulder.ibm.com (9.17.202.178) by e32.co.us.ibm.com (192.168.1.132) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Mon, 26 Mar 2012 23:56:26 -0600 Received: from d03relay03.boulder.ibm.com (d03relay03.boulder.ibm.com [9.17.195.228]) by d03dlp02.boulder.ibm.com (Postfix) with ESMTP id 471793E40036 for ; Mon, 26 Mar 2012 23:56:26 -0600 (MDT) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay03.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q2R5uPEA164034 for ; Mon, 26 Mar 2012 23:56:26 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q2R5uMtf029256 for ; Mon, 26 Mar 2012 23:56:24 -0600 Received: from us.ibm.com (f15.cn.ibm.com [9.115.118.120] (may be forged)) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with SMTP id q2R5uHfD029000; Mon, 26 Mar 2012 23:56:17 -0600 Received: by us.ibm.com (sSMTP sendmail emulation); Tue, 27 Mar 2012 13:56:14 +0800 From: zwu.kernel@gmail.com To: qemu-devel@nongnu.org Date: Tue, 27 Mar 2012 13:56:13 +0800 Message-Id: <1332827773-32358-1-git-send-email-zwu.kernel@gmail.com> X-Mailer: git-send-email 1.7.6 X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12032705-3270-0000-0000-0000051765E7 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 32.97.110.150 Cc: kwolf@redhat.com, stefanha@linux.vnet.ibm.com, kvm@vger.kernel.org, zwu.kernel@gmail.com, Zhi Yong Wu , pbonzini@redhat.com Subject: [Qemu-devel] [PATCH 2/2] block: disable I/O throttling on sync api X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Zhi Yong Wu Signed-off-by: Stefan Hajnoczi Signed-off-by: Zhi Yong Wu --- block.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/block.c b/block.c index 1fbf4dd..5baf340 100644 --- a/block.c +++ b/block.c @@ -1477,6 +1477,12 @@ static int bdrv_rw_co(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, qemu_iovec_init_external(&qiov, &iov, 1); + if (bs->io_limits_enabled) { + fprintf(stderr, "Disabling I/O throttling on '%s' due " + "to synchronous I/O.\n", bdrv_get_device_name(bs)); + bdrv_io_limits_disable(bs); + } + if (qemu_in_coroutine()) { /* Fast-path if already in coroutine context */ bdrv_rw_co_entry(&rwco);