From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37970) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRzBS-0002FZ-QI for qemu-devel@nongnu.org; Sat, 06 Feb 2016 04:29:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRzBQ-0001NY-4g for qemu-devel@nongnu.org; Sat, 06 Feb 2016 04:29:38 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:19436) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRzBP-0001Lt-8l for qemu-devel@nongnu.org; Sat, 06 Feb 2016 04:29:36 -0500 From: zhanghailiang Date: Sat, 6 Feb 2016 17:28:24 +0800 Message-ID: <1454750932-7556-13-git-send-email-zhang.zhanghailiang@huawei.com> In-Reply-To: <1454750932-7556-1-git-send-email-zhang.zhanghailiang@huawei.com> References: <1454750932-7556-1-git-send-email-zhang.zhanghailiang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH COLO-Frame v14 12/40] ram/COLO: Record the dirty pages that SVM received List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: xiecl.fnst@cn.fujitsu.com, lizhijian@cn.fujitsu.com, quintela@redhat.com, armbru@redhat.com, yunhong.jiang@intel.com, eddie.dong@intel.com, peter.huangpeng@huawei.com, dgilbert@redhat.com, zhanghailiang , arei.gonglei@huawei.com, stefanha@redhat.com, amit.shah@redhat.com, zhangchen.fnst@cn.fujitsu.com, hongyang.yang@easystack.cn We record the address of the dirty pages that received, it will help flushing pages that cached into SVM. We record them by re-using migration dirty bitmap. Signed-off-by: zhanghailiang Reviewed-by: Dr. David Alan Gilbert --- v12: - Add Reviewed-by tag v11: - Split a new helper function from original host_from_stream_offset() (Dave's suggestion) - Only do recording work in this patch v10: - New patch split from v9's patch 13 - Rebase to master to use 'migration_bitmap_rcu' --- migration/ram.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/migration/ram.c b/migration/ram.c index d49662d..1e52ef7 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2195,6 +2195,9 @@ static inline void *host_from_ram_block_offset(RAMBlock *block, static inline void *colo_cache_from_block_offset(RAMBlock *block, ram_addr_t offset) { + unsigned long *bitmap; + long k; + if (!offset_in_ramblock(block, offset)) { return NULL; } @@ -2203,6 +2206,17 @@ static inline void *colo_cache_from_block_offset(RAMBlock *block, __func__, block->idstr); return NULL; } + + k = (block->mr->ram_addr + offset) >> TARGET_PAGE_BITS; + bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap; + /* + * During colo checkpoint, we need bitmap of these migrated pages. + * It help us to decide which pages in ram cache should be flushed + * into VM's RAM later. + */ + if (!test_and_set_bit(k, bitmap)) { + migration_dirty_pages++; + } return block->colo_cache + offset; } @@ -2589,6 +2603,7 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) int colo_init_ram_cache(void) { RAMBlock *block; + int64_t ram_cache_pages = last_ram_offset() >> TARGET_PAGE_BITS; rcu_read_lock(); QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { @@ -2603,6 +2618,15 @@ int colo_init_ram_cache(void) } rcu_read_unlock(); ram_cache_enable = true; + /* + * Record the dirty pages that sent by PVM, we use this dirty bitmap together + * with to decide which page in cache should be flushed into SVM's RAM. Here + * we use the same name 'migration_bitmap_rcu' as for migration. + */ + migration_bitmap_rcu = g_new0(struct BitmapRcu, 1); + migration_bitmap_rcu->bmap = bitmap_new(ram_cache_pages); + migration_dirty_pages = 0; + return 0; out_locked: @@ -2620,9 +2644,15 @@ out_locked: void colo_release_ram_cache(void) { RAMBlock *block; + struct BitmapRcu *bitmap = migration_bitmap_rcu; ram_cache_enable = false; + atomic_rcu_set(&migration_bitmap_rcu, NULL); + if (bitmap) { + call_rcu(bitmap, migration_bitmap_free, rcu); + } + rcu_read_lock(); QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { if (block->colo_cache) { -- 1.8.3.1