From patchwork Mon Jun 10 16:03:41 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: 250267 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 8D3542C007B for ; Tue, 11 Jun 2013 02:04:54 +1000 (EST) Received: from localhost ([::1]:54526 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um4aS-0001it-Js for incoming@patchwork.ozlabs.org; Mon, 10 Jun 2013 12:04:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59833) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um4Zv-0001bI-PH for qemu-devel@nongnu.org; Mon, 10 Jun 2013 12:04:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Um4Zs-0008FY-2a for qemu-devel@nongnu.org; Mon, 10 Jun 2013 12:04:19 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:43519) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um4Zr-0008FF-Sj for qemu-devel@nongnu.org; Mon, 10 Jun 2013 12:04:16 -0400 Received: from /spool/local by e39.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Mon, 10 Jun 2013 10:04:14 -0600 Received: from d03relay05.boulder.ibm.com (d03relay05.boulder.ibm.com [9.17.195.107]) by d03dlp01.boulder.ibm.com (Postfix) with ESMTP id DCA2F1FF001F for ; Mon, 10 Jun 2013 09:59:00 -0600 (MDT) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by d03relay05.boulder.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5AG3rnW025986 for ; Mon, 10 Jun 2013 10:03:53 -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 r5AG3x8f005955 for ; Mon, 10 Jun 2013 10:03:59 -0600 Received: from mrhinesdev.klabtestbed.com (klinux.watson.ibm.com [9.2.208.21]) by d03av02.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r5AG3nnf004334; Mon, 10 Jun 2013 10:03:54 -0600 From: mrhines@linux.vnet.ibm.com To: qemu-devel@nongnu.org Date: Mon, 10 Jun 2013 12:03:41 -0400 Message-Id: <1370880226-2208-8-git-send-email-mrhines@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1370880226-2208-1-git-send-email-mrhines@linux.vnet.ibm.com> References: <1370880226-2208-1-git-send-email-mrhines@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13061016-3620-0000-0000-000003086105 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 v7 07/12] 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. Signed-off-by: Michael R. Hines --- arch_init.c | 24 ++++++++++++++++-------- include/migration/migration.h | 2 ++ 2 files changed, 18 insertions(+), 8 deletions(-) diff --git a/arch_init.c b/arch_init.c index 819ca5a..2f1fdd3 100644 --- a/arch_init.c +++ b/arch_init.c @@ -782,6 +782,21 @@ 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) +{ + memset(host, ch, TARGET_PAGE_SIZE); +#ifndef _WIN32 + if (ch == 0 && (!kvm_enabled() || kvm_has_sync_mmu()) && + getpagesize() <= TARGET_PAGE_SIZE) { + qemu_madvise(host, size, QEMU_MADV_DONTNEED); + } +#endif +} + static int ram_load(QEMUFile *f, void *opaque, int version_id) { ram_addr_t addr; @@ -849,14 +864,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) } ch = qemu_get_byte(f); - 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 1eeaa40..110f4ad 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -108,6 +108,8 @@ 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 *