From patchwork Fri Apr 12 21:37:13 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: 236222 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 0CD212C008E for ; Sat, 13 Apr 2013 07:38:27 +1000 (EST) Received: from localhost ([::1]:57721 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UQlft-0004xw-9B for incoming@patchwork.ozlabs.org; Fri, 12 Apr 2013 17:38:25 -0400 Received: from eggs.gnu.org ([208.118.235.92]:49905) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UQlfK-0004pS-BA for qemu-devel@nongnu.org; Fri, 12 Apr 2013 17:37:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UQlfF-0002tg-Rj for qemu-devel@nongnu.org; Fri, 12 Apr 2013 17:37:50 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:39259) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UQlfF-0002tb-LQ for qemu-devel@nongnu.org; Fri, 12 Apr 2013 17:37:45 -0400 Received: from /spool/local by e9.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 12 Apr 2013 17:37:43 -0400 Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 48AE76E805C for ; Fri, 12 Apr 2013 17:37:38 -0400 (EDT) Received: from d01av05.pok.ibm.com (d01av05.pok.ibm.com [9.56.224.195]) by d01relay02.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3CLbeSF296752 for ; Fri, 12 Apr 2013 17:37:40 -0400 Received: from d01av05.pok.ibm.com (loopback [127.0.0.1]) by d01av05.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r3CLberk027027 for ; Fri, 12 Apr 2013 17:37:40 -0400 Received: from mrhinesdev.klabtestbed.com (klinux.watson.ibm.com [9.2.208.21]) by d01av05.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id r3CLbT4a026720; Fri, 12 Apr 2013 17:37:39 -0400 From: mrhines@linux.vnet.ibm.com To: qemu-devel@nongnu.org Date: Fri, 12 Apr 2013 17:37:13 -0400 Message-Id: <1365802638-8478-4-git-send-email-mrhines@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1365802638-8478-1-git-send-email-mrhines@linux.vnet.ibm.com> References: <1365802638-8478-1-git-send-email-mrhines@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13041221-7182-0000-0000-00000637D73E X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] X-Received-From: 32.97.182.139 Cc: aliguori@us.ibm.com, mst@redhat.com, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v2 3/8] rdma: export 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 | 1 + 2 files changed, 17 insertions(+), 8 deletions(-) diff --git a/arch_init.c b/arch_init.c index 769ce77..77b485c 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 f6df8d1..0f4510f 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -143,4 +143,5 @@ void ram_control_load_hook(QEMUFile *f, uint32_t flags); size_t ram_control_save_page(QEMUFile *f, ram_addr_t block_offset, ram_addr_t offset, size_t size); +void ram_handle_compressed(void *host, uint8_t ch, uint64_t size); #endif