From patchwork Tue May 25 08:36:45 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yoshiaki Tamura X-Patchwork-Id: 102107 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.3/8.14.3) with ESMTP id o4P8eutd029891 for ; Tue, 25 May 2010 08:40:56 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756342Ab0EYIkr (ORCPT ); Tue, 25 May 2010 04:40:47 -0400 Received: from sh.osrg.net ([192.16.179.4]:34895 "EHLO sh.osrg.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756296Ab0EYIkk (ORCPT ); Tue, 25 May 2010 04:40:40 -0400 Received: from fs.osrg.net (postfix@fs.osrg.net [10.0.0.12]) by sh.osrg.net (8.14.3/8.14.3/OSRG-NET) with ESMTP id o4P8eJTK010222; Tue, 25 May 2010 17:40:19 +0900 Received: from localhost (hype-wd0.osrg.net [10.72.1.16]) by fs.osrg.net (Postfix) with ESMTP id A91DD3E02FB; Tue, 25 May 2010 17:40:17 +0900 (JST) From: Yoshiaki Tamura To: kvm@vger.kernel.org, qemu-devel@nongnu.org Cc: avi@redhat.com, aliguori@us.ibm.com, mtosatti@redhat.com, ohmura.kei@lab.ntt.co.jp, Yoshiaki Tamura Subject: [RFC PATCH 04/23] Use cpu_physical_memory_get_dirty_range() to check multiple dirty pages. Date: Tue, 25 May 2010 17:36:45 +0900 Message-Id: <1274776624-16435-6-git-send-email-tamura.yoshiaki@lab.ntt.co.jp> X-Mailer: git-send-email 1.7.0.31.g1df487 In-Reply-To: <1274776624-16435-1-git-send-email-tamura.yoshiaki@lab.ntt.co.jp> References: <1274776624-16435-1-git-send-email-tamura.yoshiaki@lab.ntt.co.jp> X-Dispatcher: imput version 20070423(IM149) Lines: 100 X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Tue, 25 May 2010 08:40:56 +0000 (UTC) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (sh.osrg.net [192.16.179.4]); Tue, 25 May 2010 17:40:19 +0900 (JST) X-Virus-Scanned: clamav-milter 0.96 at sh X-Virus-Status: Clean Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org diff --git a/vl.c b/vl.c index 729c955..70a8aed 100644 --- a/vl.c +++ b/vl.c @@ -2779,7 +2779,8 @@ static int ram_save_block(QEMUFile *f) static ram_addr_t current_addr = 0; ram_addr_t saved_addr = current_addr; ram_addr_t addr = 0; - int found = 0; + ram_addr_t dirty_rams[HOST_LONG_BITS]; + int i, found = 0; while (addr < last_ram_offset) { if (kvm_enabled() && current_addr == 0) { @@ -2791,28 +2792,33 @@ static int ram_save_block(QEMUFile *f) return 0; } } - if (cpu_physical_memory_get_dirty(current_addr, MIGRATION_DIRTY_FLAG)) { + if ((found = cpu_physical_memory_get_dirty_range( + current_addr, last_ram_offset, dirty_rams, HOST_LONG_BITS, + MIGRATION_DIRTY_FLAG))) { uint8_t *p; - cpu_physical_memory_reset_dirty(current_addr, - current_addr + TARGET_PAGE_SIZE, - MIGRATION_DIRTY_FLAG); + for (i = 0; i < found; i++) { + ram_addr_t page_addr = dirty_rams[i]; + cpu_physical_memory_reset_dirty(page_addr, + page_addr + TARGET_PAGE_SIZE, + MIGRATION_DIRTY_FLAG); - p = qemu_get_ram_ptr(current_addr); + p = qemu_get_ram_ptr(page_addr); - if (is_dup_page(p, *p)) { - qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_COMPRESS); - qemu_put_byte(f, *p); - } else { - qemu_put_be64(f, current_addr | RAM_SAVE_FLAG_PAGE); - qemu_put_buffer(f, p, TARGET_PAGE_SIZE); + if (is_dup_page(p, *p)) { + qemu_put_be64(f, page_addr | RAM_SAVE_FLAG_COMPRESS); + qemu_put_byte(f, *p); + } else { + qemu_put_be64(f, page_addr | RAM_SAVE_FLAG_PAGE); + qemu_put_buffer(f, p, TARGET_PAGE_SIZE); + } } - found = 1; break; + } else { + addr += dirty_rams[0]; + current_addr = (saved_addr + addr) % last_ram_offset; } - addr += TARGET_PAGE_SIZE; - current_addr = (saved_addr + addr) % last_ram_offset; } return found; @@ -2822,12 +2828,20 @@ static uint64_t bytes_transferred; static ram_addr_t ram_save_remaining(void) { - ram_addr_t addr; + ram_addr_t addr = 0; ram_addr_t count = 0; + ram_addr_t dirty_rams[HOST_LONG_BITS]; + int found = 0; - for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) { - if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) - count++; + while (addr < last_ram_offset) { + if ((found = cpu_physical_memory_get_dirty_range( + addr, last_ram_offset, dirty_rams, HOST_LONG_BITS, + MIGRATION_DIRTY_FLAG))) { + count += found; + addr = dirty_rams[found - 1] + TARGET_PAGE_SIZE; + } else { + addr += dirty_rams[0]; + } } return count;