From patchwork Sun Apr 21 21:17:56 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: 238265 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 0DB432C00EF for ; Mon, 22 Apr 2013 07:22:47 +1000 (EST) Received: from localhost ([::1]:53904 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU1if-0005l4-6X for incoming@patchwork.ozlabs.org; Sun, 21 Apr 2013 17:22:45 -0400 Received: from eggs.gnu.org ([208.118.235.92]:60455) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU1ee-0007dD-4z for qemu-devel@nongnu.org; Sun, 21 Apr 2013 17:18:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UU1eS-0008CP-GW for qemu-devel@nongnu.org; Sun, 21 Apr 2013 17:18:36 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:41220) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UU1eS-0008Bt-CL for qemu-devel@nongnu.org; Sun, 21 Apr 2013 17:18:24 -0400 Received: from /spool/local by e7.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Sun, 21 Apr 2013 17:18:22 -0400 Received: from d01relay01.pok.ibm.com (d01relay01.pok.ibm.com [9.56.227.233]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 9C2766E803A for ; Sun, 21 Apr 2013 17:18:18 -0400 (EDT) Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217]) by d01relay01.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3LLILPx307240 for ; Sun, 21 Apr 2013 17:18:21 -0400 Received: from d01av03.pok.ibm.com (loopback [127.0.0.1]) by d01av03.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r3LLIKt9023978 for ; Sun, 21 Apr 2013 18:18:20 -0300 Received: from mrhinesdev.klabtestbed.com (klinux.watson.ibm.com [9.2.208.21]) by d01av03.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r3LLIJhd023852; Sun, 21 Apr 2013 18:18:20 -0300 From: mrhines@linux.vnet.ibm.com To: qemu-devel@nongnu.org Date: Sun, 21 Apr 2013 17:17:56 -0400 Message-Id: <1366579081-6857-8-git-send-email-mrhines@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1366579081-6857-1-git-send-email-mrhines@linux.vnet.ibm.com> References: <1366579081-6857-1-git-send-email-mrhines@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13042121-5806-0000-0000-000020CF9DE5 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 32.97.182.137 Cc: aliguori@us.ibm.com, quintela@redhat.com, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v5 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 92de1bd..e272852 100644 --- a/arch_init.c +++ b/arch_init.c @@ -770,6 +770,21 @@ 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; @@ -837,14 +852,7 @@ 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 e2acec6..afc8641 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -105,6 +105,8 @@ 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 *