From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58155) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1URvtQ-0003Mw-52 for qemu-devel@nongnu.org; Mon, 15 Apr 2013 22:45:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1URvtM-0001Jc-AH for qemu-devel@nongnu.org; Mon, 15 Apr 2013 22:45:12 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:35193) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1URvtM-0001JA-57 for qemu-devel@nongnu.org; Mon, 15 Apr 2013 22:45:08 -0400 Received: from /spool/local by e7.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 15 Apr 2013 22:45:07 -0400 Received: from d01relay03.pok.ibm.com (d01relay03.pok.ibm.com [9.56.227.235]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 47A1F6E8040 for ; Mon, 15 Apr 2013 22:45:01 -0400 (EDT) Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217]) by d01relay03.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3G2j3ED292212 for ; Mon, 15 Apr 2013 22:45:03 -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 r3G2j2wS014797 for ; Mon, 15 Apr 2013 23:45:03 -0300 From: mrhines@linux.vnet.ibm.com Date: Mon, 15 Apr 2013 22:44:41 -0400 Message-Id: <1366080286-9288-4-git-send-email-mrhines@linux.vnet.ibm.com> In-Reply-To: <1366080286-9288-1-git-send-email-mrhines@linux.vnet.ibm.com> References: <1366080286-9288-1-git-send-email-mrhines@linux.vnet.ibm.com> Subject: [Qemu-devel] [PULL 3/8] rdma: export ram_handle_compressed() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 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 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 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 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 -- 1.7.10.4