From patchwork Thu Jul 14 16:29:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 648468 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3rr1XW6Przz9ry7 for ; Fri, 15 Jul 2016 02:35:39 +1000 (AEST) Received: from localhost ([::1]:55560 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNjbt-0005qz-Ks for incoming@patchwork.ozlabs.org; Thu, 14 Jul 2016 12:35:37 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51724) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNjWO-0006hy-G3 for qemu-devel@nongnu.org; Thu, 14 Jul 2016 12:29:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bNjWM-0002Dk-AV for qemu-devel@nongnu.org; Thu, 14 Jul 2016 12:29:55 -0400 Received: from orth.archaic.org.uk ([2001:8b0:1d0::2]:58290) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bNjWM-0002A6-4K for qemu-devel@nongnu.org; Thu, 14 Jul 2016 12:29:54 -0400 Received: from pm215 by orth.archaic.org.uk with local (Exim 4.84_2) (envelope-from ) id 1bNjWD-0000Jy-Hz for qemu-devel@nongnu.org; Thu, 14 Jul 2016 17:29:45 +0100 From: Peter Maydell To: qemu-devel@nongnu.org Date: Thu, 14 Jul 2016 17:29:35 +0100 Message-Id: <1468513783-25449-4-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1468513783-25449-1-git-send-email-peter.maydell@linaro.org> References: <1468513783-25449-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:8b0:1d0::2 Subject: [Qemu-devel] [PULL 03/11] target-arm: Use Neon for zero checking 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Vijay Use Neon instructions to perform zero checking of buffer. This is helps in reducing total migration time. Use case: Idle VM live migration with 4 VCPUS and 8GB ram running CentOS 7. Without Neon, the Total migration time is 3.5 Sec Migration status: completed total time: 3560 milliseconds downtime: 33 milliseconds setup: 5 milliseconds transferred ram: 297907 kbytes throughput: 685.76 mbps remaining ram: 0 kbytes total ram: 8519872 kbytes duplicate: 2062760 pages skipped: 0 pages normal: 69808 pages normal bytes: 279232 kbytes dirty sync count: 3 With Neon, the total migration time is 2.9 Sec Migration status: completed total time: 2960 milliseconds downtime: 65 milliseconds setup: 4 milliseconds transferred ram: 299869 kbytes throughput: 830.19 mbps remaining ram: 0 kbytes total ram: 8519872 kbytes duplicate: 2064313 pages skipped: 0 pages normal: 70294 pages normal bytes: 281176 kbytes dirty sync count: 3 Signed-off-by: Vijaya Kumar K Signed-off-by: Suresh Acked-by: Paolo Bonzini Message-id: 1467190029-694-2-git-send-email-vijayak@cavium.com Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- util/cutils.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/util/cutils.c b/util/cutils.c index 5830a68..7505fda 100644 --- a/util/cutils.c +++ b/util/cutils.c @@ -184,6 +184,13 @@ int qemu_fdatasync(int fd) #define SPLAT(p) _mm_set1_epi8(*(p)) #define ALL_EQ(v1, v2) (_mm_movemask_epi8(_mm_cmpeq_epi8(v1, v2)) == 0xFFFF) #define VEC_OR(v1, v2) (_mm_or_si128(v1, v2)) +#elif defined(__aarch64__) +#include "arm_neon.h" +#define VECTYPE uint64x2_t +#define ALL_EQ(v1, v2) \ + ((vgetq_lane_u64(v1, 0) == vgetq_lane_u64(v2, 0)) && \ + (vgetq_lane_u64(v1, 1) == vgetq_lane_u64(v2, 1))) +#define VEC_OR(v1, v2) ((v1) | (v2)) #else #define VECTYPE unsigned long #define SPLAT(p) (*(p) * (~0UL / 255))