From patchwork Mon Jun 10 17:16:09 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: 250318 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 6EBF62C0040 for ; Tue, 11 Jun 2013 03:18:41 +1000 (EST) Received: from localhost ([::1]:44466 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um5jr-0006FU-Fb for incoming@patchwork.ozlabs.org; Mon, 10 Jun 2013 13:18:39 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51273) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um5hn-00037w-J1 for qemu-devel@nongnu.org; Mon, 10 Jun 2013 13:16:43 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Um5hg-0007DI-Ky for qemu-devel@nongnu.org; Mon, 10 Jun 2013 13:16:31 -0400 Received: from e7.ny.us.ibm.com ([32.97.182.137]:59652) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Um5hg-0007DC-FN for qemu-devel@nongnu.org; Mon, 10 Jun 2013 13:16:24 -0400 Received: from /spool/local by e7.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Hines" This gives RDMA shared access to madvise() on the destination side when an entire chunk is found to be zero. Reviewed-by: Paolo Bonzini 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 *