From patchwork Tue Jul 16 16:48:21 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: mrhines@linux.vnet.ibm.com X-Patchwork-Id: 259465 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)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 62AB02C0107 for ; Wed, 17 Jul 2013 02:49:42 +1000 (EST) Received: from localhost ([::1]:58573 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uz8RY-00068r-8X for incoming@patchwork.ozlabs.org; Tue, 16 Jul 2013 12:49:40 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56121) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uz8Qs-0005yG-AW for qemu-devel@nongnu.org; Tue, 16 Jul 2013 12:49:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Uz8Qm-0000WH-UX for qemu-devel@nongnu.org; Tue, 16 Jul 2013 12:48:58 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:48464) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Uz8Qm-0000R9-Mq for qemu-devel@nongnu.org; Tue, 16 Jul 2013 12:48:52 -0400 Received: from /spool/local by e39.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 16 Jul 2013 10:48:43 -0600 Received: from d01dlp03.pok.ibm.com (9.56.250.168) by e39.co.us.ibm.com (192.168.1.139) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Tue, 16 Jul 2013 10:48:40 -0600 Received: from d01relay01.pok.ibm.com (d01relay01.pok.ibm.com [9.56.227.233]) by d01dlp03.pok.ibm.com (Postfix) with ESMTP id F3164C9004A for ; Tue, 16 Jul 2013 12:48:37 -0400 (EDT) Received: from d01av02.pok.ibm.com (d01av02.pok.ibm.com [9.56.224.216]) by d01relay01.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r6GGmd6B114598 for ; Tue, 16 Jul 2013 12:48:39 -0400 Received: from d01av02.pok.ibm.com (loopback [127.0.0.1]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r6GGmcai000936 for ; Tue, 16 Jul 2013 13:48:38 -0300 Received: from mrhinesdev.klabtestbed.com (klinux.watson.ibm.com [9.2.208.21]) by d01av02.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r6GGmTub000589; Tue, 16 Jul 2013 13:48:38 -0300 From: mrhines@linux.vnet.ibm.com To: qemu-devel@nongnu.org Date: Tue, 16 Jul 2013 12:48:21 -0400 Message-Id: <1373993306-25764-4-git-send-email-mrhines@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1373993306-25764-1-git-send-email-mrhines@linux.vnet.ibm.com> References: <1373993306-25764-1-git-send-email-mrhines@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13071616-3620-0000-0000-0000038AF35F X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 32.97.110.160 Cc: aliguori@us.ibm.com, quintela@redhat.com, knoel@redhat.com, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com, pbonzini@redhat.com, chegu_vinod@hp.com Subject: [Qemu-devel] [PATCH v3 resend 3/8] rdma: introduce ram_handle_compressed() 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: "Michael R. Hines" This gives RDMA shared access to madvise() on the destination side when an entire chunk is found to be zero. Reviewed-by: Juan Quintela Reviewed-by: Paolo Bonzini Reviewed-by: Chegu Vinod Tested-by: Chegu Vinod Tested-by: Michael R. Hines Signed-off-by: Michael R. Hines --- arch_init.c | 29 +++++++++++++++++++---------- include/migration/migration.h | 2 ++ 2 files changed, 21 insertions(+), 10 deletions(-) diff --git a/arch_init.c b/arch_init.c index 0e553c9..6a96bbd 100644 --- a/arch_init.c +++ b/arch_init.c @@ -777,6 +777,24 @@ static inline void *host_from_stream_offset(QEMUFile *f, return NULL; } +/* + * If a page (or a whole RDMA chunk) has been + * determined to be zero, then zap it. + */ +void ram_handle_compressed(void *host, uint8_t ch, uint64_t size) +{ + if (ch != 0 || !is_zero_page(host)) { + memset(host, ch, size); +#ifndef _WIN32 + if (ch == 0 && + (!kvm_enabled() || kvm_has_sync_mmu()) && + getpagesize() <= TARGET_PAGE_SIZE) { + qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED); + } +#endif + } +} + static int ram_load(QEMUFile *f, void *opaque, int version_id) { ram_addr_t addr; @@ -848,16 +866,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) } ch = qemu_get_byte(f); - if (ch != 0 || !is_zero_page(host)) { - memset(host, ch, TARGET_PAGE_SIZE); -#ifndef _WIN32 - if (ch == 0 && - (!kvm_enabled() || kvm_has_sync_mmu()) && - getpagesize() <= TARGET_PAGE_SIZE) { - qemu_madvise(host, TARGET_PAGE_SIZE, QEMU_MADV_DONTNEED); - } -#endif - } + ram_handle_compressed(host, ch, TARGET_PAGE_SIZE); } else if (flags & RAM_SAVE_FLAG_PAGE) { void *host; diff --git a/include/migration/migration.h b/include/migration/migration.h index f0640e0..9d3cc85 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -109,6 +109,8 @@ uint64_t xbzrle_mig_pages_transferred(void); uint64_t xbzrle_mig_pages_overflow(void); uint64_t xbzrle_mig_pages_cache_miss(void); +void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); + /** * @migrate_add_blocker - prevent migration from proceeding *